CN109280829A - A kind of high-strength casting Mg-Zn-Cu-Zr alloy and preparation method thereof - Google Patents
A kind of high-strength casting Mg-Zn-Cu-Zr alloy and preparation method thereof Download PDFInfo
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- CN109280829A CN109280829A CN201811528700.2A CN201811528700A CN109280829A CN 109280829 A CN109280829 A CN 109280829A CN 201811528700 A CN201811528700 A CN 201811528700A CN 109280829 A CN109280829 A CN 109280829A
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention belongs to metal material engineering technical field, a kind of high-strength casting Mg-Zn-Cu-Zr alloy and preparation method thereof is provided.The mass percent of its each component are as follows: Zn 4%~10%, Cu 0.1%~1.0%, Zr 0.1%~0.5%, surplus Mg.Wherein the addition of inexpensive element Zr can not only refine crystal grain, moreover it is possible to reduce damage of the other impurities element to alloy structure and performance.By being solidified under GPa grades of high pressures to routine casting Mg-Zn-Cu-Zr alloy, Solidification Structure is refined, Mg (Zn, Cu) is improved2The form and distribution of phase, the mechanical property and applied at elevated temperature range of further expansion Mg-Zn-Cu-Zr alloy.
Description
Technical field
The invention belongs to metal material engineering technical field, be related to a kind of high-strength casting Mg-Zn-Cu-Zr alloy and its
Preparation method.
Background technique
Magnesium alloy has good specific strength, specific stiffness, thermal conductivity, shock resistance and machinability, is widely used in high-end vapour
In the lightweights industrial production such as vehicle, aerospace, it has also become the potential substitute of aluminium alloy and steel industry most attraction, quilt
It is described as " 21 century green metal material ".However, since the intensity of magnesium alloy is lower, plasticity is poor and alloy addition is expensive etc.
Reason greatly limits its promotion and application in industrial production.
Mg-Zn-Cu alloy is the more successful Mg-Zn system heat-resisting alloy of commercial applications so far, below at 150 DEG C
High-temperature behavior is preferable, and being successfully used for automotive engine component, propeller etc. needs on high temperature resistant components.But due to casting
Mg-Zn-Cu alloy structure is coarseer, and main hardening constituent Mg (Zn, Cu)2Eutectic phase is linked to be net distribution in interdendritic, no more
But Mg (Zn, Cu)2The invigoration effect of phase can not give full play to, and can also reduce the mechanical property of casting Mg-Zn-Cu alloy.For
Mg-Zn-Cu alloy items mechanical property is further increased, technical staff attempts around techniques such as alloying, heat treatment and extruding
Expansion research, such as: 102071345 A of patent CN discloses a kind of Mg-Zn-Cu alloy containing Zr, the weight percent of component
Than are as follows: Zn 5~7%, Cu 0.5~2%, Zr 0.3~0.8%, surplus Mg, after being sufficiently heat-treated the maximum tensile strength,
Yield strength, elongation percentage are respectively up to 240~270MPa, 160~190MPa and 11~17%；J.Buha has studied ageing treatment pair
The influence of Mg-6Zn-2Cu-0.1Mn alloy property, peak timeliness alloy the maximum tensile strength, yield strength, elongation percentage reach respectively
220~253MPa, 121~168MPa and 2.8~8.6% (J.Buha, Mechanicalpropertiesofnaturallyag
EdMg-Zn-Cu-Mnalloy, Materials Science andEngineering A, 2008,489:127-137)；Zhao Chong
Have studied influence of the extrusion process to Mg-Zn-Cu-Ce alloy property, through different extrusion process processing after alloy tensile strength,
Yield strength and elongation percentage are respectively up to 293~321MPa, 215~282MPa and 2.04~15.7% (Zhao Chong, Mg-Zn-Cu-Ce
Alloy structure and performance study, University Of Chongqing's master thesis, 2012).
Although the above method makes moderate progress to the mechanical property of Mg-Zn-Cu alloy, the hardening constituent under high temperature in alloy is easy
Long greatly overaging phase, strengthening effect is still undesirable, and the introducing of precious metal element (such as Ce) also increases cost of alloy.
And it studies the discovery preferable high-temperature behavior of Mg-Zn-Cu alloy and is present in eutectic phase Mg (Zn, Cu) with Cu2It is related, therefore refine casting
It makes Mg-Zn-Cu alloy structure, improve Mg (Zn, Cu)2Eutectic phase morphology and distribution can significantly improve alloy mechanical property, and at
This is cheaper.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes the systems of a kind of novel low-cost, high-performance Mg-Zn-Cu-Zr alloy
Standby technique, wherein the addition of inexpensive element Zr can not only refine crystal grain, moreover it is possible to reduce other impurities element to alloy structure
With the damage of performance.By solidifying under GPa grades of high pressures to routine casting Mg-Zn-Cu-Zr alloy, it is solidifying alloy has been refined
Gu tissue improves Mg (Zn, Cu)2The form and distribution of phase, the mechanical property and height of further expansion Mg-Zn-Cu-Zr alloy
Warm use scope.
The present invention adopts the following technical scheme that:
A kind of high-strength casting Mg-Zn-Cu-Zr alloy, the mass percent of each component are as follows: Zn 4%~10%, Cu
0.1%~1.0%, Zr 0.1%~0.5%, surplus Mg.
The preferred scope of the mass percent of aforementioned alloy compositions are as follows: Zn 7%, Cu 0.5%, Zr 0.2%, surplus are
Mg。
The preparation method of above-mentioned high-strength casting Mg-Zn-Cu-Zr alloy, comprising the following steps:
(1) use purity for 99.99% Mg ingot, purity be 99.99% Zn ingot, Cu/Zn mass ratio be 7:3 brass
With Mg-30%Zr intermediate alloy as raw material, mass percent needed for calculating each raw material according to subject alloy ingredient；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 750~770 DEG C, when crucible temperature reaches 300~350 DEG C
Mg ingot, Zn ingot is added, is passed through volume ratio CO2/SF6The mixed gas of=99:1 protects gas as melting；To Mg ingot, Zn in crucible
It is to close among the brass and Mg-30%Zr of 7:3 that Cu/Zn is sequentially added when ingot melts completely and crucible temperature reaches 650~700 DEG C
Gold simultaneously keeps the temperature 2min~5min；Molten surface dross, heat preservation 20 are stirred and removed when furnace temperature reaches 750 DEG C~770 DEG C
Then molten metal is poured onto preheated metal mold by~30min, metal mold preheating temperature is 450~500 DEG C, obtains institute
Need Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing,
Temperature is set as 240~300 DEG C, and soaking time 12~24 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, then by assembled graphite group encapsulation
It is put into the cavity position of high pressure cubic apparatus, starts High Pressure Solidification after tup alignment: first by pressure rise to setting freezing pressure
2GPa~6GPa, while starting temperature measuring equipment, and be heated rapidly to 770 DEG C~970 DEG C of preset heating temperature, at such a temperature
15~20min of heat-insulation pressure keeping closes power supply and stops heating, release and takes out after naturally cooling to room temperature, obtain final alloy
Sample.
In abovementioned steps (5), High Pressure Solidification experiment is carried out using CS-1B type high pressure cubic hinge press, is pushed up with two sides
Press system is compared, and cubic hinge press saves a pre-stress die and a heavy duty mill housing, while the pressure field in high pressure chest
It is even more ideal.
In abovementioned steps (5), before high pressure is packed into graphite group encapsulation with sample, it is the introducing for effectively avoiding impurity element, needs
It cleans sample surfaces: first with impurity such as each surface and oil contaminant of 600~2000# fine sandpaper removal sample and oxide layers, being then placed in
It is cleaned in supersonic wave cleaning machine, is finally putting into 110 DEG C of drying boxes dry 12h or more.
In abovementioned steps (5), need to test liquidus curve of each specimen sample in the case where GPa grades of high pressures act on before setting heating temperature
Temperature.According to Clausius-Clapeyren equation, melting point substance is with pressure change by the shadow of volume change when solid-liquid phase change
It rings.Since fusion process of the Mg under high pressure effect is expansion reaction, therefore Mg fusing point is increased with pressure increase.By laboratory sample
The heating and heat preservation for carrying out different temperatures under the effect of 2~6GPa high pressure respectively, are rapidly cooled to room temperature under pressure maintaining, solidifying according to it
Gu tissue signature determines liquidus temperature；The heating temperature set is each+30 DEG C of high pressure sample liquidus temperature or so.
In abovementioned steps (5), what the crucible for containing High Pressure Solidification sample was selected is boron nitride crucible, boron nitride crucible
It the use of temperature is under vacuum 1800 DEG C, thermal shock resistance is good, not easy to crack under chilling；Boron nitride crucible size should basis
Specimen size selection or machining, the excessive sample that will affect contain and are heated, too small then to send out in the process because of METAL HEATING PROCESS
Heat expands and spalling crucible.
In abovementioned steps (5), whether the stringent each tup for wiping and checking CS-1B type high pressure cubic hinge press before testing
There is crackle.
In abovementioned steps (5), CS-1B type high pressure cubic hinge press is using preceding needing to preheat 30min in advance；The heating process moment
Ammeter variation is paid close attention to, electric current should not be too large；When release, first using unload at a slow speed be depressed into 20MPa after be changed to fast pressure relief again.
Compared with prior art, the invention has the following advantages that
1, Zr is a low-cost alloy addition element, and suitable Zr is added in Mg-Zn-Cu alloy can not only refine
Alloy grain, moreover it is possible to reduce damage of the other impurities element to alloy structure and performance, improve the plasticity of Mg-Zn-Cu alloy simultaneously
Improve corrosion resistance.
2, the preferable high-temperature behavior of Mg-Zn-Cu alloy and Cu are present in eutectic phase Mg (Zn, Cu)2It is related, but cast Mg-
Zn-Cu As-cast Microstructure is coarseer, and main hardening constituent Mg (Zn, Cu)2For eutectic phase and it is linked to be net distribution in dendrite more
Between.Mg-Zn-Cu-Zr alloy on the one hand can be made to obtain more crystallization nucleus numbers using High Pressure Solidification technology, significant refinement is solidifying
Gu tissue, on the other hand Mg (Zn, the Cu) during High Pressure Solidification2The netted form of eutectic phase is interrupted, and becomes and is discontinuously distributed
Graininess or island form are distributed more uniform.Therefore, the intensity of alloy is increased dramatically.
3, the Mg-Zn-Cu system alloy through ageing treatment, the hardening constituent when high temperature range is on active service in alloy are easily grown up
For overaging phase, alloy mechanical property is made to decline to a great extent；And the Mg-Zn-Cu-Zr alloy of High Pressure Solidification technology preparation is used, by force
Degree and hardness significantly improve and high-temperature behavior is more stable, and maximum compressive strength, yield strength and elongation percentage be respectively 320.6~
430.3MPa, 280.2~370.1MPa, 16.3~21.3%.
Detailed description of the invention
Fig. 1 is the microscopic structure under routine casting Mg-7Zn-0.5Cu-0.2Zr alloy different amplification；
Fig. 2 is the microscopic structure under the Mg-7Zn-0.5Cu-0.2Zr alloy different amplification of High Pressure Solidification preparation
(6GPa)。
Specific embodiment
The present invention is further illustrated With reference to embodiment, but the contents of the present invention are not limited to following realities
Apply example.
Embodiment 1: a kind of high-strength casting Mg-Zn-Cu-Zr alloy, each component and mass percent are as follows: Zn 7%,
Cu 0.8%, Zr 0.4%, surplus Mg, gross mass 100%.
Preparation method is as follows:
(1) Mg ingot, Zn ingot of the purity for 99.99% are used, the brass and Mg-30%Zr intermediate alloy that Cu/Zn is 7:3 are made
For raw material, Zn is 7%, Cu 0.8% by weight percent, and Zr 0.4%, surplus is that the alloy compositions of Mg are matched
Material；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 760 DEG C, Mg ingot, Zn is added when crucible temperature reaches 350 DEG C
Ingot is passed through CO2/SF6The mixed gas of=99:1 protects gas as melting；Melt completely to Mg ingot, Zn ingot in crucible and crucible temperature
Degree sequentially adds the brass that Cu/Zn is 7:3 and Mg-30%Zr intermediate alloy and keeps the temperature 5min when reaching 670 DEG C；When furnace temperature reaches
Molten surface dross is stirred and removed at 760 DEG C, keeps the temperature 20min, then molten metal is poured onto preheated metal mold
In (metal mold preheating temperature be 500 DEG C), obtain required Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing,
Temperature is set as 280 DEG C, and soaking time 14 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, then by assembled graphite group encapsulation
It is put into the cavity position of high pressure cubic apparatus, starts High Pressure Solidification after tup alignment: first by pressure rise to setting freezing pressure
2GPa, while starting temperature measuring equipment, and be heated rapidly to 800 DEG C of preset heating temperature, at such a temperature heat-insulation pressure keeping
18min closes power supply and stops heating, release and takes out after naturally cooling to room temperature, obtain high-strength casting Mg-7Zn-
0.8Cu-0.4Zr alloy sample.
Embodiment 2: a kind of high-strength casting Mg-Zn-Cu-Zr alloy, each component and mass percent are as follows: Zn 8%,
Cu 1%, Zr 0.3%, surplus Mg, gross mass 100%.
Preparation method is as follows:
(1) Mg ingot, Zn ingot of the purity for 99.99% are used, the brass and Mg-30%Zr intermediate alloy that Cu/Zn is 7:3 are made
For raw material, Zn is 8%, Cu 1% by weight percent, and Zr 0.3%, surplus is that the alloy compositions of Mg are matched
Material；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 770 DEG C, Mg ingot, Zn is added when crucible temperature reaches 350 DEG C
Ingot is passed through CO2/SF6The mixed gas of=99:1 protects gas as melting；Melt completely to Mg ingot, Zn ingot in crucible and crucible temperature
Degree sequentially adds the brass that Cu/Zn is 7:3 and Mg-30%Zr intermediate alloy and keeps the temperature 4min when reaching 700 DEG C；When furnace temperature reaches
Molten surface dross is stirred and removed at 770 DEG C, keeps the temperature 25min, then molten metal is poured onto preheated metal mold
In (metal mold preheating temperature be 450 DEG C), obtain required Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing,
Temperature is set as 260 DEG C, and soaking time 16 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, then by assembled graphite group encapsulation
It is put into the cavity position of high pressure cubic apparatus, starts High Pressure Solidification after tup alignment: first by pressure rise to setting freezing pressure
4GPa, while starting temperature measuring equipment, and be heated rapidly to 850 DEG C of preset heating temperature, at such a temperature heat-insulation pressure keeping
15min closes power supply and stops heating, release and takes out after naturally cooling to room temperature, obtain high-strength casting Mg-8Zn-1Cu-
0.3Zr alloy sample.
Embodiment 3: a kind of high-strength casting Mg-Zn-Cu-Zr alloy, each component and mass percent are as follows: Zn 6%,
Cu 1%, Zr 0.2%, surplus Mg, gross mass 100%.
Preparation method is as follows:
(1) Mg ingot, Zn ingot of the purity for 99.99% are used, the brass and Mg-30%Zr intermediate alloy that Cu/Zn is 7:3 are made
For raw material, Zn is 6%, Cu 1% by weight percent, and Zr 0.2%, surplus is that the alloy compositions of Mg are matched
Material；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 750 DEG C, Mg ingot, Zn is added when crucible temperature reaches 300 DEG C
Ingot is passed through CO2/SF6The mixed gas of=99:1 protects gas as melting；Melt completely to Mg ingot, Zn ingot in crucible and crucible temperature
Degree sequentially adds the brass that Cu/Zn is 7:3 and Mg-30%Zr intermediate alloy and keeps the temperature 4min when reaching 660 DEG C；When furnace temperature reaches
Molten surface dross is stirred and removed at 750 DEG C, keeps the temperature 20min, then molten metal is poured onto preheated metal mold
In (metal mold preheating temperature be 450 DEG C), obtain required Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing,
Temperature is set as 250 DEG C, and soaking time 20 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, then by assembled graphite group encapsulation
It is put into the cavity position of high pressure cubic apparatus, starts High Pressure Solidification after tup alignment: first by pressure rise to setting freezing pressure
5GPa, while starting temperature measuring equipment, and be heated rapidly to 900 DEG C of preset heating temperature, at such a temperature heat-insulation pressure keeping
20min closes power supply and stops heating, release and takes out after naturally cooling to room temperature, obtain high-strength casting Mg-6Zn-1Cu-
0.2Zr alloy sample.
Embodiment 4: a kind of high-strength casting Mg-Zn-Cu-Zr alloy, each component and mass percent are as follows: Zn 7%,
Cu 0.5%, Zr 0.2%, surplus Mg, gross mass 100%.
Preparation method is as follows:
(1) Mg ingot, Zn ingot of the purity for 99.99% are used, the brass and Mg-30%Zr intermediate alloy that Cu/Zn is 7:3 are made
For raw material, Zn is 7%, Cu 0.5% by weight percent, and Zr 0.2%, surplus is that the alloy compositions of Mg are matched
Material；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 760 DEG C, Mg ingot, Zn is added when crucible temperature reaches 300 DEG C
Ingot is passed through CO2/SF6The mixed gas of=99:1 protects gas as melting；Melt completely to Mg ingot, Zn ingot in crucible and crucible temperature
Degree sequentially adds the brass that Cu/Zn is 7:3 and Mg-30%Zr intermediate alloy and keeps the temperature 3min when reaching 680 DEG C；When furnace temperature reaches
Molten surface dross is stirred and removed at 760 DEG C, keeps the temperature 25min, then molten metal is poured onto preheated metal mold
In (metal mold preheating temperature be 500 DEG C), obtain required Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing,
Temperature is set as 250 DEG C, and soaking time 18 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, then by assembled graphite group encapsulation
It is put into the cavity position of high pressure cubic apparatus, starts High Pressure Solidification after tup alignment: first by pressure rise to setting freezing pressure
6GPa, while starting temperature measuring equipment, and be heated rapidly to 950 DEG C of preset heating temperature, at such a temperature heat-insulation pressure keeping
20min closes power supply and stops heating, release and takes out after naturally cooling to room temperature, obtain high-strength casting Mg-7Zn-
0.5Cu-0.2Zr alloy sample.
Performance comparison:
Following table is the room temperature tensile properties of heterogeneity Mg-Zn-Cu-Zr alloy in above-described embodiment, wherein comparative alloy
1, comparative alloy 2 is respectively the nearly peak value Mg- that state-run Materials Research Laboratories J.Buha of Japan et al. is obtained through T4 and T6 ageing treatment
6Zn-2Cu-0.1Mn alloy (Materials Science and Engineering A2008,489:127-137), comparison are closed
The Mg-Zn-Cu-Zr alloy (patent CN 102071345A) that gold 3 obtains for bright red plum et al. cast and subsequent heat treatment, it is right
Than room temperature tensile properties (Zhao Chong, the Mg-Zn-Cu-Ce conjunction that alloy 4 is the Mg-Zn-Cu-Ce alloy that Zhao Chong is obtained through extrusion process
Payment organization and performance study, University Of Chongqing's master thesis, 2012), Examples 1 to 4 is to be obtained using the technology of the present invention
Mg-Zn-Cu-Zr alloy.
As seen from the above table, the casting Mg-Zn-Cu-Zr alloy that the present invention is prepared by High Pressure Solidification technology, maximum resistance to compression
Intensity is 320.6~430.3MPa, and maximum yield strength is 280.2~370.1MPa, and maximum extension rate is 16.3~21.3%.
Compared with comparative alloy 1,2,3, the present invention has better compression strength, yield strength and elongation percentage, and is provided simultaneously with more preferable
Thermal stability, overaging phenomenon will not be generated during high temperature long service；Compared with comparative alloy 4, in the present invention not
Containing high cost addition element (Ce), casting cost is lower.
Fig. 1 is routine casting Mg-7Zn-0.5Cu-0.2Zr alloy microscopic structure, shows that its nascent crystalline substance α-Mg is coarse tree
Arborescent structure, " dendrite group " average-size is about 365 μm, the interdendritic α-Mg it is continuously distributed eutectic the second phase Mg (Zn, Cu)2。
Fig. 2 is the Mg-7Zn-0.5Cu-0.2Zr alloy microscopic structure of 6GPa High Pressure Solidification preparation.With routine shown in FIG. 1
The comparison of technic metal solidified structure is cast it is found that the nascent crystalline substance α-Mg in the lower technic metal solidified structure of high pressure effect is mostly tiny
Isometric " dendrite group ", dendritic morphology is relatively regular, complete, and molten disconnected Fragmentation Phenomena is few, and branch is undeveloped, and " dendrite group " average-size is about
It is 56 μm；The reticular structure that the second phase of intergranular is formed is interrupted, and the second phase of intergranular is in that long island or graininess are discontinuously distributed in more
The interdendritic α-Mg.
Claims (6)
1. a kind of high-strength casting Mg-Zn-Cu-Zr alloy, which is characterized in that the mass percent of its each component are as follows: Zn 4%
~10%, Cu 0.1%~1.0%, Zr 0.1%~0.5%, surplus Mg.
2. high-strength casting Mg-Zn-Cu-Zr alloy according to claim 1, which is characterized in that the quality of its each component
Percentage are as follows: Zn 7%, Cu 0.5%, Zr 0.2%, surplus Mg.
3. the preparation method of high-strength casting Mg-Zn-Cu-Zr alloy of any of claims 1 or 2, which is characterized in that including with
Lower step:
(1) use purity for 99.99% Mg ingot, purity be 99.99% Zn ingot, Cu/Zn mass ratio be 7:3 brass and
Mg-30%Zr intermediate alloy is as raw material, mass percent needed for calculating each raw material according to subject alloy ingredient；
(2) step (1) described raw material is preheated at 250 DEG C；
(3) heating temperature of crucible electrical resistance furnace is set as 750~770 DEG C, the addition when crucible temperature reaches 300~350 DEG C
Mg ingot, Zn ingot, are passed through volume ratio CO2/SF6The mixed gas of=99:1 protects gas as melting；It is complete to Mg ingot, Zn ingot in crucible
It is complete to melt and when crucible temperature reaches 650~700 DEG C sequentially adds brass that Cu/Zn is 7:3 and Mg-30%Zr intermediate alloy simultaneously
Keep the temperature 2min~5min；It is stirred and removes molten surface dross when furnace temperature reaches 750 DEG C~770 DEG C, heat preservation 20~
Then molten metal is poured onto preheated metal mold by 30min, metal mold preheating temperature is 450~500 DEG C, needed for obtaining
Mg-Zn-Cu-Zr cast alloy material；
(4) the Mg-Zn-Cu-Zr cast alloy material of above-mentioned preparation is put into vacuum resistance furnace and carries out homogenizing annealing, temperature
It is set as 240~300 DEG C, soaking time 12~24 hours, then wire cutting was at high pressure sample；
(5) the high pressure sample that step (4) obtains is fitted into graphite group encapsulation, is then put into assembled graphite group encapsulation
The cavity position of high pressure cubic apparatus, tup alignment after start High Pressure Solidification: first by pressure rise to set freezing pressure 2GPa~
6GPa, while starting temperature measuring equipment, and be heated rapidly to 770 DEG C~970 DEG C of preset heating temperature, heat preservation is protected at such a temperature
15~20min is pressed, power supply is closed and stops heating, release and taken out after naturally cooling to room temperature, obtain final alloy sample.
4. according to claim 3 with the preparation method of high-strength casting Mg-Zn-Cu-Zr alloy, which is characterized in that step
Suddenly in (5), before high pressure is packed into graphite group encapsulation with sample, it is the introducing for effectively avoiding impurity element, sample surfaces need to be cleaned: is first
First with impurity such as 600~2000# fine sandpaper each surface and oil contaminant of removal sample and oxide layers, be then placed in supersonic wave cleaning machine into
Row cleaning is finally putting into 110 DEG C of drying boxes dry 12h or more.
5. with the preparation method of high-strength casting Mg-Zn-Cu-Zr alloy according to claim 3 or 4, which is characterized in that
In step (5), high pressure is carried out to the heating and heat preservation of different temperatures under the effect of 2~6GPa high pressure respectively with sample, under pressure maintaining
It is rapidly cooled to room temperature, liquidus temperature is determined according to its Peculiarities of Solidification Structure；The heating temperature set is each high pressure sample liquid
+ 30 DEG C of liquidus temperature.
6. with the preparation method of high-strength casting Mg-Zn-Cu-Zr alloy according to claim 3 or 4, which is characterized in that
What the crucible for containing High Pressure Solidification sample was selected is boron nitride crucible.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061791A (en) * | 2021-03-26 | 2021-07-02 | 华中科技大学 | Magnesium alloy, magnesium alloy casting and manufacturing method thereof |
| CN114032432A (en) * | 2021-09-02 | 2022-02-11 | 衢州学院 | Biological high-entropy alloy and preparation method thereof |
| CN114540688A (en) * | 2022-02-28 | 2022-05-27 | 黑龙江科技大学 | Ultrahigh-pressure heat treatment method for Mg-Zn-Zr-Gd alloy |
| CN115109975A (en) * | 2022-05-27 | 2022-09-27 | 季华实验室 | Magnesium alloy containing precipitation strengthening phase of nano core-shell structure and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061791A (en) * | 2021-03-26 | 2021-07-02 | 华中科技大学 | Magnesium alloy, magnesium alloy casting and manufacturing method thereof |
| CN113061791B (en) * | 2021-03-26 | 2022-05-13 | 华中科技大学 | Magnesium alloy, magnesium alloy casting and manufacturing method thereof |
| CN114032432A (en) * | 2021-09-02 | 2022-02-11 | 衢州学院 | Biological high-entropy alloy and preparation method thereof |
| CN114540688A (en) * | 2022-02-28 | 2022-05-27 | 黑龙江科技大学 | Ultrahigh-pressure heat treatment method for Mg-Zn-Zr-Gd alloy |
| CN114540688B (en) * | 2022-02-28 | 2022-12-16 | 黑龙江科技大学 | Ultrahigh-pressure heat treatment method for Mg-Zn-Zr-Gd alloy |
| CN115109975A (en) * | 2022-05-27 | 2022-09-27 | 季华实验室 | Magnesium alloy containing precipitation strengthening phase of nano core-shell structure and preparation method thereof |
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