CN114182147A - High-strength high-thermal-conductivity magnesium alloy and preparation method thereof - Google Patents
High-strength high-thermal-conductivity magnesium alloy and preparation method thereof Download PDFInfo
- Publication number
- CN114182147A CN114182147A CN202111497843.3A CN202111497843A CN114182147A CN 114182147 A CN114182147 A CN 114182147A CN 202111497843 A CN202111497843 A CN 202111497843A CN 114182147 A CN114182147 A CN 114182147A
- Authority
- CN
- China
- Prior art keywords
- magnesium alloy
- strength
- extrusion
- rolling
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000001125 extrusion Methods 0.000 claims abstract description 55
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 239000000956 alloy Substances 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims description 37
- 238000009749 continuous casting Methods 0.000 claims description 23
- 229910045601 alloy Inorganic materials 0.000 claims description 20
- 230000009467 reduction Effects 0.000 claims description 17
- 238000000265 homogenisation Methods 0.000 claims description 14
- 238000003723 Smelting Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 21
- 238000001953 recrystallisation Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 14
- 239000013078 crystal Substances 0.000 abstract description 13
- 239000006104 solid solution Substances 0.000 abstract description 13
- 238000007670 refining Methods 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000002244 precipitate Substances 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 239000000155 melt Substances 0.000 description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 12
- 238000001816 cooling Methods 0.000 description 12
- 229910052749 magnesium Inorganic materials 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 238000004321 preservation Methods 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/024—Forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a high-strength high-heat-conductivity magnesium alloy and a preparation method thereof, belonging to the technical field of magnesium alloy materials. According to the invention, the obtained recrystallized grains can be ensured not to grow up in the deformation process under the low-temperature extrusion deformation condition by adopting the low extrusion temperature of 100-200 ℃, so that the purpose of improving the strength is achieved by refining the grains, and the coarse grains without dynamic recrystallization can ensure that the material has good thermal conductivity and realize synchronous improvement of the strength and the thermal conductivity. The invention can further improve the recrystallization degree of the material by rolling after extrusion deformation, and can ensure that the recrystallized grains do not grow up and improve the texture strength by adopting the low-temperature rolling temperature of 150-250 ℃, so that the strength of the material is further improved. The invention can make solid solution elements precipitate to form a second phase in the extrusion and rolling processes, thereby obviously refining crystal grains and improving the strength and the heat conductivity of the magnesium alloy.
Description
Technical Field
The invention relates to the technical field of magnesium alloy materials, in particular to a high-strength high-heat-conductivity magnesium alloy and a preparation method thereof.
Background
The high-strength high-heat-conductivity magnesium alloy as a structural material can be widely applied to aerospace vehicles. Pure magnesium has a thermal conductivity of about 156W/(m · K) at room temperature, second only to steel and aluminum in commercial metal materials. However, pure magnesium has insufficient mechanical properties and low yield strength, and the mechanical properties of magnesium alloys are generally improved by alloying methods. The higher the alloying degree of the magnesium alloy is, the better the mechanical property is, but the poorer the heat-conducting property is. Therefore, the key factor for effectively improving the strength and the heat conductivity of the magnesium alloy is to regulate and control the structure of the magnesium alloy through a reasonable processing mode.
At present, the magnesium alloy crystal grains are usually refined by adopting violent plastic deformation processes such as equal-channel angular extrusion, reciprocating extrusion and the like so as to achieve the purpose of improving the strength, but the materials prepared by the processes have smaller size and cannot be directly used for preparing processing parts and large components; and due to the limitation of equipment, a die and a process, the production efficiency is low, the cost is high, and the requirement of industrial production is difficult to meet. Meanwhile, the magnesium alloy has poor plastic deformation capability, so that severe plastic deformation often causes the problem of material cracking, the performance of the material is influenced, and the aims of improving the strength and the heat conductivity cannot be fulfilled at the same time.
Therefore, it is desirable to provide a method for preparing a magnesium alloy, which can combine the properties of high yield strength and good thermal conductivity.
Disclosure of Invention
The invention aims to provide a high-strength high-heat-conductivity magnesium alloy and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the technical scheme of the invention provides a preparation method of a high-strength high-heat-conductivity magnesium alloy, which comprises the following steps:
(1) sequentially smelting and casting the alloy raw materials to obtain a magnesium alloy ingot;
(2) homogenizing the magnesium alloy ingot obtained in the step (1) to obtain a pretreated ingot blank;
(3) sequentially extruding and rolling the pretreated ingot blank obtained in the step (2) to obtain a high-strength high-heat-conductivity magnesium alloy; the extrusion temperature is 100-200 ℃, and the rolling temperature is 150-250 ℃.
Preferably, the extrusion ratio in the extrusion in the step (3) is 10: 1-25: 1.
Preferably, the extrusion speed of the extrusion in the step (3) is 0.1-0.5 mm/s.
Preferably, the rolling reduction in the step (3) is 10% to 40%.
Preferably, the rolling direction in the step (3) is the same as the extrusion direction.
Preferably, the heat preservation temperature of the homogenization treatment in the step (2) is 440-520 ℃, and the heat preservation time of the homogenization treatment is 12-48 h.
Preferably, the step (1) is carried out while applying electromagnetic vibration; the frequency of the electromagnetic vibration is 40-45 Hz.
Preferably, the casting of step (1) is a semi-continuous casting; the casting temperature of the semi-continuous casting is 650-750 ℃, and the casting speed of the semi-continuous casting is 150-200 mm/min.
Preferably, the high-strength high-heat-conductivity magnesium alloy comprises one of Mg-Mn, Mg-Mn-Zn and Mg-Mn-Ce series magnesium alloys.
The invention also provides the high-strength high-heat-conductivity magnesium alloy prepared by the preparation method in the technical scheme.
The invention provides a preparation method of a high-strength high-heat-conductivity magnesium alloy, which comprises the following steps: (1) sequentially smelting and casting the alloy raw materials to obtain a magnesium alloy ingot; (2) homogenizing the magnesium alloy ingot obtained in the step (1) to obtain a pretreated ingot blank; (3) sequentially extruding and rolling the pretreated ingot blank obtained in the step (2) to obtain a high-strength high-heat-conductivity magnesium alloy; the extrusion temperature is 100-200 ℃, and the rolling temperature is 150-250 ℃. According to the invention, the magnesium alloy ingot obtained by smelting and casting is firstly subjected to homogenization treatment, so that the segregation and casting stress in the ingot can be effectively reduced, and the subsequent plastic deformation is more favorably carried out; in addition, the extrusion is firstly carried out in the plastic deformation, so that not only can the casting defects in the as-cast structure be effectively eliminated and the structure be homogenized, but also a large amount of dislocation and distortion energy can be generated in the magnesium alloy structure, dynamic recrystallization can be induced, and a double-structure formed by combining fine dynamic recrystallization grains and coarse grains which are not recrystallized is obtained. The invention also adopts a lower extrusion temperature of 100-200 ℃, and can ensure that the obtained recrystallized grains do not grow in the deformation process under the condition of low-temperature extrusion deformation, thereby realizing grain refinement and achieving the purpose of improving the strength. Meanwhile, the coarse crystals which are not subjected to dynamic recrystallization can ensure that the material has good thermal conductivity, and the synchronous improvement of the strength and the thermal conductivity is realized. In addition, the invention can further improve the recrystallization degree of the material by rolling after extrusion deformation, and the low-temperature rolling temperature of 150-250 ℃ can ensure that the recrystallized grains do not grow, and can also improve the strength of the texture formed in the extrusion process, so that the strength of the material is further improved. In addition, in the extrusion and rolling processes, the solid solution amount of solid solution elements (such as Mn, Zn, Ce and other elements) in the magnesium matrix is obviously reduced along with the reduction of the temperature, under the low-temperature extrusion and rolling deformation conditions of the invention, because the solid solution amount of the solid solution elements is in a supersaturated state, a large amount of second phases containing the solid solution elements can be dynamically precipitated from a supersaturated solution in the extrusion deformation process, and the second phases which are dispersedly distributed can pin grain boundaries, hinder the movement of the grain boundaries and inhibit the growth of recrystallized grains, thereby obviously improving the strength of the material; moreover, the solid solution elements are dynamically precipitated to strengthen the alloy performance, and simultaneously, solid solution atoms in the magnesium matrix are consumed, so that the scattering of electrons caused by lattice distortion of the magnesium matrix is reduced, the heat conductivity is improved, and finally, the magnesium alloy material with high strength and excellent heat conductivity is prepared by the technical scheme of the invention.
The results of the embodiment show that when the magnesium alloy prepared by the preparation method provided by the invention is subjected to tensile and thermal conductivity tests, the yield strength at room temperature of the magnesium alloy after low-temperature extrusion treatment and low-temperature rolling can reach 300-360 MPa, the tensile strength can reach 320-390 MPa, the elongation can reach 9-18%, and the thermal conductivity can reach 125-140W/(m.K).
The preparation method provided by the invention has the advantages of simple process and easily controlled parameters, and is suitable for large-scale production; and more trace elements are not needed to be added, so that the magnesium alloy is more beneficial to light weight and low in cost.
Drawings
FIG. 1 is a metallographic micrograph of a high strength and high thermal conductivity magnesium alloy prepared in example 4 of the present invention.
Detailed description of the preferred embodiments
The invention provides a preparation method of a high-strength high-heat-conductivity magnesium alloy, which comprises the following steps:
(1) sequentially smelting and casting the alloy raw materials to obtain a magnesium alloy ingot;
(2) homogenizing the magnesium alloy ingot obtained in the step (1) to obtain a pretreated ingot blank;
(3) sequentially extruding and rolling the pretreated ingot blank obtained in the step (2) to obtain a high-strength high-heat-conductivity magnesium alloy; the extrusion temperature is 100-200 ℃, and the rolling temperature is 150-250 ℃.
The invention carries out smelting and casting on alloy raw materials in sequence to obtain the magnesium alloy ingot.
The source of the alloy raw material is not particularly limited in the present invention, and commercially available materials known to those skilled in the art may be used.
In the invention, the high-strength high-heat-conductivity magnesium alloy preferably comprises one of Mg-Mn, Mg-Mn-Zn and Mg-Mn-Ce series magnesium alloys.
In the invention, the smelting temperature is preferably 700-780 ℃, and more preferably 720-740 ℃. The smelting time is not specially limited, and the alloy raw materials can be fully melted and uniformly mixed.
In the present invention, the casting is preferably semi-continuous casting; the casting temperature of the semi-continuous casting is preferably 650-750 ℃, and more preferably 680-700 ℃; the casting speed of the semi-continuous casting is preferably 150-200 mm/min, and more preferably 160-180 mm/min. According to the invention, by adopting semi-continuous casting and controlling the casting temperature and the casting speed of the semi-continuous casting, the melt can obtain a proper cooling rate, and the casting defects of shrinkage porosity, shrinkage cavity, coarse dendrite and the like of the cast ingot can be further favorably reduced.
In the invention, the cooling water amount of the semi-continuous casting crystallizer is preferably 15-20 m3More preferably 15 to 18m3H, most preferably 16m3H is used as the reference value. The invention is more beneficial to ensuring that the melt obtains a proper cooling rate by controlling the cooling water quantity of the crystallizer for semi-continuous casting within the range, thereby further reducing the casting defects of shrinkage porosity, shrinkage cavity, coarse dendritic crystal and the like of the cast ingot.
In the present invention, it is preferable to apply electromagnetic vibration at the same time when the casting is performed; the frequency of the electromagnetic vibration is preferably 40-45 Hz, and more preferably 42-44 Hz. According to the invention, by applying electromagnetic vibration during casting, casting defects such as shrinkage porosity and shrinkage cavity in the melt can be effectively removed, and dendritic crystals and crystal grains of the ingot are refined, so that the magnesium alloy ingot with uniform and compact structure is obtained, and the strength and the thermal conductivity of the magnesium alloy are improved.
After the magnesium alloy ingot is obtained, the magnesium alloy ingot is subjected to homogenization treatment to obtain a pretreated ingot blank.
In the invention, the heat preservation temperature of the homogenization treatment is preferably 440-520 ℃, more preferably 460-500 ℃, and most preferably 480 ℃; the heat preservation time of the homogenization treatment is preferably 12-48 h, more preferably 15-40 h, and most preferably 20-30 h. According to the invention, through homogenization treatment, the problems of element segregation, casting stress and the like in the magnesium alloy ingot can be effectively reduced, the structure of the magnesium alloy is more homogenized, and the structure preparation is made for the subsequent plastic deformation of the magnesium alloy.
After the pretreated ingot blank is obtained, the pretreated ingot blank is sequentially extruded and rolled to obtain the high-strength high-heat-conductivity magnesium alloy.
In the invention, the extrusion temperature is 100-200 ℃, preferably 120-180 ℃, and more preferably 140-160 ℃. By controlling the extrusion temperature within the range, the invention can ensure that the plastic deformation is carried out in the extrusion process at a lower constant temperature, and the obtained recrystallized grains can not grow up in the deformation process, thereby realizing the purpose of refining the grains to improve the strength of the magnesium alloy; meanwhile, the coarse crystals which are not subjected to dynamic recrystallization can ensure that the material has good thermal conductivity, so that the strength and the thermal conductivity are synchronously improved.
In the present invention, the extrusion ratio in the extrusion is preferably 10:1 to 25:1, more preferably 12:1 to 20:1, and most preferably 15:1 to 16: 1. The invention is more beneficial to the precipitation of a second phase in the low-temperature rolling process of the magnesium alloy ingot blank by controlling the extrusion ratio in the extrusion within the range, thereby effectively refining the magnesium alloy crystal grains and improving the thermal conductivity.
In the present invention, the extrusion speed of the extrusion is preferably 0.1 to 0.5mm/s, more preferably 0.1 to 0.3mm/s, and most preferably 0.1 to 0.2 mm/s. The invention can ensure that the ingot blank does not have the problems of cracks and the like under low-temperature rolling by controlling the extrusion speed of extrusion within the range, and is more favorable for crushing coarse dendritic crystals and inducing dynamic recrystallization.
In the invention, the rolling temperature is 150-250 ℃, preferably 170-230 ℃, and more preferably 190-200 ℃. By controlling the rolling temperature within the range, the invention can further improve the recrystallization degree of the extruded magnesium alloy ingot blank at lower temperature, ensure that the recrystallized grains do not grow, and simultaneously improve the texture strength formed in the extrusion process, so that the strength of the material is further improved. In addition, the invention adopts the processes of low-temperature extrusion and low-temperature rolling treatment, can also ensure that the solid solution amount of solid solution elements (such as Mn, Zn, Ce and other elements) in the magnesium matrix is in a supersaturated state, can dynamically precipitate a large amount of second phases containing the solid solution elements from the supersaturated solid solution in the deformation process, pins grain boundaries in a dispersion distribution state, hinders grain boundary movement and inhibits the growth of recrystallized grains, thereby obviously strengthening the mechanical property of the magnesium alloy, and reduces the scattering of electrons caused by lattice distortion of the magnesium matrix due to the precipitation of the solid solution atoms, thereby improving the thermal conductivity and finally preparing the magnesium alloy with high strength and high thermal conductivity.
In the present invention, the rolling reduction is preferably 10% to 40%, more preferably 20% to 35%, and most preferably 30%. The invention is more beneficial to further refining the dendrite and the crystal grain of the ingot blank obtained by extrusion by controlling the rolling reduction rate in the range, and further improves the recrystallization degree.
In the present invention, the rolling pass is preferably 3 to 5 times, and more preferably 4 times. In the present invention, the single-pass reduction rate of the rolling is preferably 5% to 10%, more preferably 6% to 8%, and most preferably 7% to 8%. The invention adopts multi-pass rolling and controls the rolling pass and the pass reduction rate within the range, thereby being more beneficial to the full deformation of the ingot blank structure, leading the structure to be more compact and the crystal grains to be more refined.
In the present invention, the rolling direction is preferably the same as the extrusion direction. According to the invention, through carrying out plastic deformation in the same rolling and extrusion directions, dislocation and deformation energy in a deformed structure can be accumulated continuously, so that recrystallization can be better induced, crystal grains can be further refined effectively, and the strength and the heat conductivity of the magnesium alloy can be obviously improved.
The preparation method provided by the invention can be used for preparing the magnesium alloy material with high strength and excellent thermal conductivity, and is simple in process, easy in parameter control and suitable for large-scale production; under the condition of the preparation method provided by the invention, more trace elements do not need to be added into the magnesium alloy matrix, so that the magnesium alloy is more beneficial to light weight and has low cost.
The invention also provides the high-strength high-heat-conductivity magnesium alloy prepared by the preparation method in the technical scheme.
In the present invention, the recrystallization integral number of the high-strength high-thermal-conductivity magnesium alloy is preferably 60% to 80%, more preferably 65% to 75%, and most preferably 70%.
In the invention, the size of the recrystallized grains of the high-strength high-heat-conductivity magnesium alloy is preferably 1-2 μm, more preferably 1.2-1.8 μm, and most preferably 1.5 μm.
The high-strength high-thermal conductivity magnesium alloy prepared by the preparation method provided by the invention is compact in structure and fine in crystal grain, and has high strength and high thermal conductivity.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a preparation method of a high-strength high-heat-conductivity magnesium alloy (Mg-0.9Mn alloy), which comprises the following steps:
1. smelting and casting: heating a pure magnesium ingot to 720 ℃ in the atmosphere of nitrogen protection gas for melting, adding Mg-Mn intermediate alloy, continuously melting until the melt is uniform, cooling the melt to 700 ℃ for semi-continuous casting, simultaneously applying electromagnetic vibration with the electromagnetic frequency of 40Hz, wherein the casting speed is 160mm/min, and the cooling water amount of a crystallizer in the semi-continuous casting process is 16m3And h, obtaining the magnesium alloy ingot.
2. Homogenizing: and (3) preserving the heat of the obtained magnesium alloy ingot for 24 hours at the heat preservation temperature of the homogenization treatment of 500 ℃, and cooling the magnesium alloy ingot to room temperature in air to obtain a pretreated ingot blank.
3. And (3) extruding the pretreated ingot blank at 120 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.1mm/s, then rolling at 150 ℃, the rolling reduction rate is 36%, the rolling pass is 4 times, the single-pass rolling reduction rate is 9%, and the magnesium alloy with the recrystallization volume fraction of 80% and the recrystallization grain size of 2 microns is prepared.
Example 2
The embodiment provides a preparation method of a high-strength high-heat-conductivity magnesium alloy (Mg-0.9Mn-0.5Zn alloy), which comprises the following steps:
1. smelting and casting: heating a pure magnesium ingot to 720 ℃ in the atmosphere of nitrogen protection gas for melting, adding Mg-Mn intermediate alloy, finally adding pure zinc ingot for continuously melting until the melt is uniform, cooling the melt to 700 ℃ for semi-continuous casting, and simultaneously applying electromagnetic vibration with the electromagnetic frequency of 40Hz, wherein the casting speed is 160mm/min, and the cooling water amount of a crystallizer in the semi-continuous casting process is 16m3And h, obtaining the magnesium alloy ingot.
2. Homogenizing: and (3) preserving the heat of the obtained magnesium alloy ingot for 24 hours at the heat preservation temperature of the homogenization treatment of 460 ℃, and cooling the magnesium alloy ingot to room temperature in air to obtain a pretreated ingot blank.
3. And (2) extruding the pretreated ingot blank at 150 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.1mm/s, then rolling at 200 ℃, the rolling reduction rate is 32%, the rolling pass is 4 times, the single-pass rolling reduction rate is 8%, and the magnesium alloy with the recrystallization volume fraction of 80% and the recrystallization grain size of 1.8 mu m is prepared.
Example 3
The embodiment provides a preparation method of a high-strength high-heat-conductivity magnesium alloy (Mg-0.9Mn-0.9Zn alloy), which comprises the following steps:
1. smelting and casting: heating a pure magnesium ingot to 720 ℃ in the atmosphere of nitrogen protection gas for melting, adding Mg-Mn intermediate alloy, finally adding pure zinc ingot for continuously melting until the melt is uniform, cooling the melt to 700 ℃ for semi-continuous casting, and simultaneously applying electromagnetic vibration with the electromagnetic frequency of 40Hz, wherein the casting speed is 160mm/min, and the cooling water amount of a crystallizer in the semi-continuous casting process is 16m3And h, obtaining the magnesium alloy ingot.
2. Homogenizing: and (3) preserving the heat of the obtained magnesium alloy ingot for 24 hours at the heat preservation temperature of the homogenization treatment of 440 ℃, and cooling the magnesium alloy ingot to room temperature in air to obtain a pretreated ingot blank.
3. And (3) extruding the pretreated ingot blank at 180 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.1mm/s, then rolling at 230 ℃, the rolling reduction rate is 30%, the rolling pass is 4 times, the single-pass rolling reduction rate is 7.5%, and the magnesium alloy with the recrystallization volume fraction of 75% and the recrystallization grain size of 1.0 mu m is prepared.
Example 4
The embodiment provides a preparation method of a high-strength high-heat-conductivity magnesium alloy (Mg-0.9Mn-0.5Ce alloy), which comprises the following steps:
1. smelting and casting: heating a pure magnesium ingot to 720 ℃ in the atmosphere of nitrogen protection gas for melting, adding Mg-Mn intermediate alloy, finally adding Mg-Ce intermediate alloy for continuously melting until the melt is uniform, cooling the melt to 700 ℃ for semi-continuous casting, and simultaneously applying electromagnetic vibration with the electromagnetic frequency of 40Hz, wherein the casting speed is 160mm/min, and the cooling water amount of a crystallizer in the semi-continuous casting process is 16m3And h, obtaining the magnesium alloy ingot.
2. Homogenizing: and (3) preserving the heat of the obtained magnesium alloy ingot for 24 hours at the heat preservation temperature of the homogenization treatment of 500 ℃, and cooling the magnesium alloy ingot to room temperature in air to obtain a pretreated ingot blank.
3. And (3) extruding the pretreated ingot blank at 150 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.1mm/s, then rolling at 200 ℃, the rolling reduction rate is 30 percent, the rolling pass is 4 times, the single-pass rolling reduction rate is 7.5 percent, and the magnesium alloy with 68 percent of recrystallized volume and 1.8 mu m of recrystallized grain size is prepared.
Example 5
The embodiment provides a preparation method of a high-strength high-heat-conductivity magnesium alloy (Mg-0.9Mn-0.9Ce alloy), which comprises the following steps:
1. smelting and casting: heating a pure magnesium ingot to 720 ℃ in the atmosphere of nitrogen protection gas for melting, adding Mg-Mn intermediate alloy, finally adding Mg-Ce intermediate alloy for continuously melting until the melt is uniform, cooling the melt to 700 ℃ for semi-continuous casting, and simultaneously applying electromagnetic vibration with the electromagnetic frequency of 40Hz, wherein the casting speed is 160mm/min, and the cooling water amount of a crystallizer in the semi-continuous casting process is 16m3H is obtained byAnd (4) casting a magnesium alloy ingot.
2. Homogenizing: and (3) preserving the heat of the obtained magnesium alloy ingot for 24 hours at the heat preservation temperature of the homogenization treatment of 500 ℃, and cooling the magnesium alloy ingot to room temperature in air to obtain a pretreated ingot blank.
3. And (3) extruding the pretreated ingot blank at 180 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.1mm/s, then rolling at 230 ℃, the rolling reduction rate is 28%, the rolling pass is 4 times, the single-pass rolling reduction rate is 7%, and the magnesium alloy with the recrystallization volume fraction of 70% and the recrystallization grain size of 1.5 mu m is prepared.
Metallographic structure observation was performed on the high-strength high-thermal conductivity magnesium alloy prepared in example 4, and the metallographic structure is shown in fig. 1. As can be seen from fig. 1, after extrusion and rolling, the high-strength high-thermal conductivity magnesium alloy has a compact structure and fine grains.
The high-strength high-thermal conductivity magnesium alloy prepared in the embodiment 1-5 is subjected to tensile and thermal conductivity tests. The test results are shown in table 1.
TABLE 1 data of mechanical and thermal conductivity measurements for high strength and high thermal conductivity magnesium alloys
As can be seen from Table 1, the magnesium alloy prepared by the preparation method provided by the invention has the room-temperature yield strength of 300-360 MPa, the tensile strength of 320-390 MPa, the elongation of 9-18% and the thermal conductivity of 125-140W/(m.K). Therefore, the magnesium alloy prepared by the preparation method provided by the invention has high strength and high thermal conductivity, and also has high elongation and good plasticity.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A preparation method of a high-strength high-heat-conductivity magnesium alloy comprises the following steps:
(1) sequentially smelting and casting the alloy raw materials to obtain a magnesium alloy ingot;
(2) homogenizing the magnesium alloy ingot obtained in the step (1) to obtain a pretreated ingot blank;
(3) sequentially extruding and rolling the pretreated ingot blank obtained in the step (2) to obtain a high-strength high-heat-conductivity magnesium alloy; the extrusion temperature is 100-200 ℃, and the rolling temperature is 150-250 ℃.
2. The production method according to claim 1, wherein the extrusion ratio in the extrusion in the step (3) is 10:1 to 25: 1.
3. The production method according to claim 1 or 2, wherein the extrusion speed in the step (3) is 0.1 to 0.5 mm/s.
4. The production method according to claim 1, wherein the reduction rate of rolling in the step (3) is 10% to 40%.
5. The production method according to claim 1 or 4, wherein the rolling direction in the step (3) is the same as the extrusion direction.
6. The preparation method according to claim 1, wherein the temperature for the homogenization treatment in the step (2) is 440-520 ℃, and the time for the homogenization treatment is 12-48 h.
7. The production method according to claim 1, wherein the step (1) of casting is carried out while applying electromagnetic vibration; the frequency of the electromagnetic vibration is 40-45 Hz.
8. The production method according to claim 1 or 7, wherein the casting of step (1) is a semi-continuous casting; the casting temperature of the semi-continuous casting is 650-750 ℃, and the casting speed of the semi-continuous casting is 150-200 mm/min.
9. The preparation method according to claim 1, wherein the high-strength high-thermal conductivity magnesium alloy comprises one of Mg-Mn, Mg-Mn-Zn and Mg-Mn-Ce series magnesium alloys.
10. A high-strength high-thermal conductivity magnesium alloy prepared by the preparation method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497843.3A CN114182147B (en) | 2021-12-09 | 2021-12-09 | High-strength high-thermal-conductivity magnesium alloy and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497843.3A CN114182147B (en) | 2021-12-09 | 2021-12-09 | High-strength high-thermal-conductivity magnesium alloy and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114182147A true CN114182147A (en) | 2022-03-15 |
| CN114182147B CN114182147B (en) | 2022-12-09 |
Family
ID=80603993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111497843.3A Active CN114182147B (en) | 2021-12-09 | 2021-12-09 | High-strength high-thermal-conductivity magnesium alloy and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114182147B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011824A (en) * | 2022-06-30 | 2022-09-06 | 中南大学 | High-strength and high-creep-resistance magnesium alloy and preparation method and application thereof |
| CN115261693A (en) * | 2022-07-27 | 2022-11-01 | 西南大学 | High-strength high-thermal-conductivity rare earth magnesium alloy and preparation method thereof |
| CN116043081A (en) * | 2023-02-20 | 2023-05-02 | 长沙理工大学 | High impact magnesium alloy for transportation equipment and preparation method and application thereof |
| WO2023080056A1 (en) * | 2021-11-05 | 2023-05-11 | 国立研究開発法人物質・材料研究機構 | Magnesium-based alloy extension material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046868A (en) * | 2014-06-26 | 2014-09-17 | 宝山钢铁股份有限公司 | Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof |
| CN104651689A (en) * | 2015-02-28 | 2015-05-27 | 重庆大学 | High thermal conductivity magnesium alloy used under high temperature and preparation method thereof |
| CN105755340A (en) * | 2014-12-17 | 2016-07-13 | 宝山钢铁股份有限公司 | Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof |
| CN113293329A (en) * | 2020-02-21 | 2021-08-24 | 宝山钢铁股份有限公司 | Low-cost high-strength high-heat-conductivity magnesium alloy material and manufacturing method thereof |
-
2021
- 2021-12-09 CN CN202111497843.3A patent/CN114182147B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046868A (en) * | 2014-06-26 | 2014-09-17 | 宝山钢铁股份有限公司 | Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof |
| CN105755340A (en) * | 2014-12-17 | 2016-07-13 | 宝山钢铁股份有限公司 | Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof |
| CN104651689A (en) * | 2015-02-28 | 2015-05-27 | 重庆大学 | High thermal conductivity magnesium alloy used under high temperature and preparation method thereof |
| CN113293329A (en) * | 2020-02-21 | 2021-08-24 | 宝山钢铁股份有限公司 | Low-cost high-strength high-heat-conductivity magnesium alloy material and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 姜廷: "《工程科技Ⅰ辑》", 15 December 2009, pages: 1 - 2 * |
| 张丁非等著: "《高性能镁合金晶粒细化新技术》", 31 January 2016, 北京：冶金工业出版社, pages: 13 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023080056A1 (en) * | 2021-11-05 | 2023-05-11 | 国立研究開発法人物質・材料研究機構 | Magnesium-based alloy extension material |
| CN115011824A (en) * | 2022-06-30 | 2022-09-06 | 中南大学 | High-strength and high-creep-resistance magnesium alloy and preparation method and application thereof |
| CN115261693A (en) * | 2022-07-27 | 2022-11-01 | 西南大学 | High-strength high-thermal-conductivity rare earth magnesium alloy and preparation method thereof |
| CN116043081A (en) * | 2023-02-20 | 2023-05-02 | 长沙理工大学 | High impact magnesium alloy for transportation equipment and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114182147B (en) | 2022-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114182147B (en) | High-strength high-thermal-conductivity magnesium alloy and preparation method thereof | |
| CN109355538B (en) | Production process of high-strength 7-series aluminum alloy pipe | |
| EP3650561B1 (en) | Plastic wrought magnesium alloy and preparation method thereof | |
| CN109136506B (en) | Processing method for inhibiting coarse grain ring of aluminum alloy section and aluminum alloy section | |
| CN110983131B (en) | 7-series aluminum alloy section and manufacturing method thereof | |
| CN112626401B (en) | 2XXX series aluminum alloy and preparation method thereof | |
| CN110983124A (en) | High-conductivity 6-series aluminum alloy and production process thereof | |
| CN109161828A (en) | A kind of processing technology and aluminium alloy extrusions for reducing T5 state aluminium alloy Surface of profile coarse-grain | |
| CN108950337B (en) | Low-cost high-strength Mg-Zn-Y-Ce-Ca magnesium alloy and preparation method thereof | |
| CN113106306A (en) | High-strength corrosion-resistant 5xxx series alloy and preparation method thereof | |
| WO1993008314A1 (en) | Strength enhancement of rapidly solidified aluminum-lithium through double aging | |
| CN109680194B (en) | Preparation method of high-strength extruded section of Mg-Zn-Sn-Mn alloy | |
| CN114574792A (en) | Processing method for synchronously improving strength and heat conductivity of magnesium alloy | |
| CN113293329A (en) | Low-cost high-strength high-heat-conductivity magnesium alloy material and manufacturing method thereof | |
| CN111020320A (en) | High-strength aluminum alloy and production method thereof | |
| CN104532091A (en) | 2-series aluminum alloy | |
| CN114561575A (en) | Preparation method of Er and Zr compositely added high-toughness aluminum alloy | |
| CN115011824A (en) | High-strength and high-creep-resistance magnesium alloy and preparation method and application thereof | |
| CN105525176A (en) | Preparation and treatment process of Mg-Gd-Y-Zr alloy | |
| CN110607472A (en) | High-strength AZ81 magnesium alloy material containing Ce-based misch metal and preparation process thereof | |
| US10273564B2 (en) | Aluminium based alloys for high temperature applications and method of producing such alloys | |
| CN115612897B (en) | Method for reducing coarse grain layer of 6082 aluminum alloy section | |
| CN115652158B (en) | Creep-resistant Mg-Al deformed magnesium alloy and preparation method thereof | |
| CN112126830B (en) | Preparation and heat treatment process of high-strength high-plasticity Al-Mg-Si-Sc aluminum alloy plate | |
| CN104152765A (en) | Magnesium-lithium-aluminum-neodymium alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |