CN114959390A - High-strength high-creep-resistance ultra-light magnesium-lithium alloy and preparation method thereof - Google Patents
High-strength high-creep-resistance ultra-light magnesium-lithium alloy and preparation method thereof Download PDFInfo
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- 239000001989 lithium alloy Substances 0.000 title claims abstract description 74
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 39
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 22
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 21
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 238000005728 strengthening Methods 0.000 claims abstract description 10
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 8
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 6
- 229910017863 MgGd Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 14
- 230000032683 aging Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 229910019400 Mg—Li Inorganic materials 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- DFIYZNMDLLCTMX-UHFFFAOYSA-N gadolinium magnesium Chemical compound [Mg].[Gd] DFIYZNMDLLCTMX-UHFFFAOYSA-N 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 2
- 239000013079 quasicrystal Substances 0.000 claims description 2
- 239000000956 alloy Substances 0.000 abstract description 14
- 229910045601 alloy Inorganic materials 0.000 abstract description 14
- 230000001413 cellular effect Effects 0.000 abstract description 2
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 6
- 238000012512 characterization method Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000000518 rheometry Methods 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000905 alloy phase Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 210000001995 reticulocyte Anatomy 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910000748 Gd alloy Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
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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
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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
- C22C23/06—Alloys based on magnesium with a rare earth metal 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
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
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Abstract
The invention relates to the field of magnesium-lithium alloys, in particular to a high-strength high-creep-resistance ultra-light magnesium-lithium alloy and a preparation method thereof, which solve the problems of insufficient high-temperature mechanical strength and extremely poor creep resistance of the magnesium-lithium alloy, form a reticulated cellular (average diameter is less than 150 microns) high-temperature-resistant intermetallic compound with the volume fraction of 20-60% at the crystal boundary of a matrix through reasonably selecting alloy elements, form a fine (less than 5 microns) dispersion strengthening precipitated phase in the crystal, and prepare the magnesium-lithium alloy with higher mechanical strength and high creep resistance under the high-temperature condition of 100-350 ℃. The preparation method of the invention is suitable for the alloy and comprises the following components in percentage by weight: the lithium-manganese composite material comprises, by weight, 5-12% of lithium (Li), 8-15% of gadolinium (Gd) and the balance of magnesium (Mg). The invention can obviously improve the high-temperature mechanical property of the magnesium-lithium alloy and broaden the practical engineering application of the magnesium-lithium alloy.
Description
Technical Field
The invention relates to the field of magnesium-lithium alloys, in particular to a high-strength high-creep-resistance ultralight magnesium-lithium alloy and a preparation method thereof, and especially relates to an Mg-Li-Gd ternary magnesium-lithium alloy material with high strength and high creep resistance at a high temperature of 100-350 ℃ and a preparation method thereof.
Background
Hitherto, Mg-Li alloy is the lightest metal structure material, and the density of the Mg-Li alloy is 1.35-1.65 g/cm 3 Has the characteristics of high specific strength and specific rigidity, strong cold and hot deformability, unobvious anisotropy, good low-temperature performance and the like, and is ideal light in the fields of aerospace, aviation, electronics, military and the likeA structural material. However, the magnesium-lithium alloy has the disadvantages of low absolute strength, poor high temperature resistance, extremely poor creep resistance and corrosion resistance, and the like, and the application and further development of the alloy are severely restricted. The document (mater.sci.eng.a. (materials science and engineering) 528(2011)6157) reports that the tensile strength of the two-phase magnesium-lithium alloy at the temperature of 200-300 ℃ is only 2-10 MPa, and the reason is mainly that the matrix phase is easy to generate large plastic rheology under the high-temperature condition. Based on this, in order to improve the high temperature mechanical resistance and creep resistance of the magnesium-lithium alloy, a reticulated high temperature resistant intermetallic compound needs to be formed around the matrix phase to effectively hinder the plastic rheology of the matrix phase under high temperature conditions. According to the Mg-Gd binary phase diagram, the melting point of the MgGd alloy phase formed in the alloy is higher, wherein the Mg 5 Gd、Mg 3 Gd、Mg 2 The initial melting temperatures of Gd and MgGd are 548 deg.C, 658 deg.C, 720 deg.C and 756 deg.C, respectively. In addition, the addition of Li does not form an intermetallic compound with Gd. Therefore, an MgGd phase having a high melting point will be formed in the Mg-Li-Gd alloy. If the volume fraction and the distribution of the MgGd phase can be reasonably controlled, the high-temperature plastic rheological inhibition of the MgGd phase on the matrix phase can be completely realized, the high-temperature mechanical strength and the creep resistance of the magnesium-lithium alloy are further improved, and a new solution idea can be provided for improving and expanding the temperature application range of the magnesium-lithium alloy.
Disclosure of Invention
The invention aims to provide a high-strength high-creep-resistance ultra-light magnesium-lithium alloy and a preparation method thereof, which solve the problems of insufficient high-temperature mechanical strength and extremely poor creep resistance of the magnesium-lithium alloy, form a reticulated high-temperature-resistant intermetallic compound at a crystal boundary of a matrix by reasonably selecting alloy elements, and form a fine dispersion-strengthened precipitated phase in the crystal to prepare the magnesium-lithium alloy with high mechanical strength and high creep resistance under the high-temperature condition of 100-350 ℃.
The technical scheme of the invention is as follows:
the ultra-light magnesium-lithium alloy with high strength and high creep resistance is Mg-Li-Gd ternary magnesium-lithium alloy, and comprises the following components in percentage by weight: the content of lithium is 5-12%, and the content of gadolinium is 8-15%; the balance of the magnesium content is balance.
The ultra-light magnesium-lithium alloy with high strength and high creep resistance is suitable for quasicrystal reinforced Mg-Li-Gd magnesium-lithium alloy which takes an alpha-Mg close-packed hexagonal structure (HCP) as a matrix, a beta-Li body-centered cubic structure (BCC) as a matrix or an (alpha-Mg + beta-Li) double phase as a matrix.
In the high-strength high-creep-resistance ultralight magnesium-lithium alloy, a reticulated high-temperature-resistant magnesium-gadolinium intermetallic compound is formed at the crystal boundary of a matrix, and the average diameter of the reticulated cells is less than 150 micrometers.
In the high-strength high-creep-resistance ultralight magnesium-lithium alloy, the volume fraction of a reticulated high-temperature-resistant magnesium-gadolinium intermetallic compound formed at a crystal boundary of a matrix is 20-60%.
The magnesium gadolinium intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 5-10%.
The preparation method of the ultralight magnesium-lithium alloy with high strength and high creep resistance comprises the following heat treatment process of the magnesium-lithium alloy: firstly, homogenizing treatment is carried out for 5-50 hours at the temperature of 500-540 ℃, and water quenching and cooling are carried out to room temperature; and carrying out aging treatment at 180-220 ℃ for 10-80 hours, quenching with water, and cooling to room temperature to form fine dispersion strengthening precipitated phases with the size less than 5 microns in the crystal.
The performance indexes of the magnesium-lithium alloy of the ultralight magnesium-lithium alloy with high strength and high creep resistance are as follows: tensile strength (sigma) at a temperature of 100 to 350 DEG C UTS ) 40 to 280MPa, yield strength (sigma) 0.2 ) 25 to 210MPa, an elongation (delta) of 20 to 80%, and a density of 1.46 to 1.91g/cm 3 。
The design idea of the invention is as follows:
for Mg-Li-Gd ternary magnesium-lithium alloys, the lithium element in the alloy does not form an intermetallic compound with the magnesium and gadolinium elements. Meanwhile, magnesium and gadolinium elements can form an MgGd alloy phase with a higher melting point. Wherein, Mg 5 Gd、Mg 3 Gd、Mg 2 Onset melting temperatures of Gd and MgGd, respectivelyAt 548 ℃, 658 ℃, 720 ℃ and 756 ℃. According to the invention, by reasonably regulating the addition amount of the magnesium-lithium alloy during rolling, a certain volume fraction of reticulated high-temperature-resistant MgGd intermetallic compound is formed around the crystal boundary of the matrix, so that plastic rheology of the matrix phase under a high-temperature condition can be effectively hindered. In addition, a dispersion strengthening precipitated phase is precipitated in the crystal through high-temperature aging, and the effective pinning effect on dislocation movement in the crystal can be achieved. Based on the dual functions of the reticulocyte high-melting-point intermetallic compound formed at the crystal boundary and the intra-crystal aging precipitation dispersion strengthening phase, the high-temperature mechanical strength and the creep resistance of the magnesium-lithium alloy can be obviously improved, and the high-end requirements of the industries such as aerospace, military industry and automobiles on light weight development are met.
The invention has the advantages and beneficial effects that:
1. according to the invention, by controlling the addition amount of gadolinium in the magnesium-lithium alloy, a latticed high-temperature resistant MgGd intermetallic compound is formed at the crystal boundary of a matrix, and meanwhile, a fine dispersion strengthening precipitated phase is formed in the crystal, so that the plastic rheology of the matrix phase under a high-temperature condition is effectively hindered, and the dislocation motion in the crystal is effectively pinned.
2. The magnesium-lithium alloy with low density, high-temperature mechanical strength and creep resistance is obtained by adopting the method, and the method is particularly suitable for the requirements of light-weight, high-strength and high-toughness materials, and widens the temperature application range of the magnesium-lithium alloy.
3. The processing technology of the invention is simple and convenient to operate.
Drawings
FIG. 1 is a photomicrograph of a Mg-Li-Gd Mg-Li alloy, showing the SEM images of the morphology, reticulocyte size and volume fraction of reticulocyte-like refractory intermetallic compounds distributed at grain boundaries in the matrix (examples 1, 2 and 3).
FIG. 2 is a scanning electron micrograph of Mg-Li-Gd-Mg-Li alloy showing the details of the morphology of the reticulated refractory intermetallic compound at the grain boundaries and the morphology, distribution, and size of the dispersion-strengthened phase precipitated in the crystal (examples 1, 2, and 3).
Detailed Description
In the specific implementation process, through reasonable selection of alloy elements, a cellular (average diameter is less than 150 micrometers, preferably 80-100 micrometers) high-temperature-resistant magnesium gadolinium intermetallic compound with the volume fraction of 20-60% is formed at the crystal boundary of a matrix, and a fine (less than 5 micrometers, preferably 1-3 micrometers) dispersion strengthening precipitated phase is formed in the crystal, so that the magnesium-lithium alloy with high mechanical strength and high creep resistance performance at the high temperature of 100-350 ℃ is prepared. The preparation method of the invention is applicable to the components and the contents of the alloy according to the weight percentage: 5-12% (preferably 6-8%) of lithium (Li), 8-15% (preferably 10-13%) of gadolinium (Gd), and the balance magnesium (Mg).
The present invention is further illustrated by the following specific examples, which are given by way of illustration and not by way of limitation, and the scope of the present invention is not limited by the following specific examples.
Example 1
In this embodiment, the ultra-light magnesium-lithium alloy with high strength and high creep resistance and the preparation method thereof mainly include the following steps:
i), magnesium-lithium alloy composition adopted and smelting
The cast Mg-Li-Gd magnesium-lithium alloy comprises the following chemical components in percentage by weight: 8% of Li, 13% of Gd and the balance of Mg. The elements taken out of the raw materials are as follows: lithium (Li), zinc (Zn), magnesium gadolinium master alloy (Mg-25 wt% Gd) and the balance magnesium (Mg). A vacuum resistance furnace is adopted, according to the composition ratio, the total weight of ingredients is 15 kg, and 7.3 kg of high-purity magnesium (with the purity of 99.95 wt%), 0.9 kg of high-purity lithium (with the purity of 99.99 wt%) and 7.8 kg of magnesium gadolinium intermediate alloy (Mg-25 wt% Gd) are added into a crucible in the furnace. The furnace is vacuumized to the vacuum degree of 2.0 multiplied by 10 -2 When Pa, the furnace is filled with argon to 9.5X 10 4 Pa, then starting to heat up in the furnace, raising the temperature of the furnace to 720 ℃, keeping the temperature for 1 hour, and then stirring in the furnace. And standing for 30 minutes, carrying out furnace casting, cooling to room temperature, taking out the cast ingot, and finishing alloy smelting.
II) homogenization treatment process
Keeping the temperature of the as-cast Mg-Li-Gd magnesium-lithium alloy at 530 ℃ for 40 hours, and then quenching with water and cooling to room temperature.
III) aging treatment process
And (3) carrying out artificial aging treatment on the homogenized Mg-Li-Gd magnesium-lithium alloy at the temperature of 210 ℃ for 24 hours, and then carrying out water quenching and cooling to room temperature.
IV) microstructural characterization
The microstructure of the Mg-Li-Gd magnesium-lithium alloy after aging treatment is observed by a scanning electron microscope, and the preparation process of the alloy sample is as follows: using No. 1000 silicon carbide water abrasive paper to grind the surface; then mechanically polishing by adopting oil-based diamond grinding paste; the morphology of the reticulated high-temperature resistant intermetallic compound distributed at the grain boundary in the as-cast Mg-Li-Gd magnesium-lithium alloy matrix has the average diameter of 120 microns and the volume fraction of 40 percent, which is shown in figure 1. After aging, the Mg-Li-Gd-Mg-Li alloy matrix is distributed with dispersion strengthening phases separated out in the crystal, and the average size of the dispersion strengthening phases is 2 microns, which is shown in figure 2.
In this embodiment, the Mg-Gd intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 8%.
V) high temperature mechanical property test
The high-temperature mechanical tensile property sample of the alloy is plate-shaped, the standard length of the sample is 25mm, the width of the sample is 5mm, and the thickness of the sample is 4 mm. Strain rate of 1X 10 in tensile test -3 s -1 . Tensile testing was performed on an MTS (858.01M) tensile torsion tester. In the present example, the material containing the lithium-magnesium alloy had a tensile strength of 210MPa, a yield strength of 156MPa, an elongation of δ 25%, and a density of 1.65g/cm at a temperature of 150 ℃ 3 。
Example 2
In this embodiment, the ultra-light magnesium-lithium alloy with high strength and high creep resistance and the preparation method thereof mainly include the following steps:
i), magnesium-lithium alloy composition adopted and smelting
The cast Mg-Li-Gd magnesium-lithium alloy comprises the following chemical components in percentage by weight: 10% of Li, 10% of Gd and the balance of Mg. Refer to the ingredients and smelting mode of example 1.
II) homogenization treatment process
And (3) preserving the temperature of the as-cast Mg-Li-Gd magnesium-lithium alloy at 510 ℃ for 50 hours, and then quenching and cooling to room temperature.
III) aging treatment process
And (3) carrying out artificial aging treatment on the homogenized Mg-Li-Gd magnesium-lithium alloy at the temperature of 200 ℃ for 48 hours, and then carrying out water quenching and cooling to room temperature.
IV) microstructural characterization
Microstructure characterization of reference example 1.
In this embodiment, the Mg-Gd intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 7%.
V) high temperature mechanical property test
Mechanical properties test of reference example 1. In the present example, the material containing the lithium-magnesium alloy had a tensile strength of 150MPa, a yield strength of 102MPa, an elongation of δ 39%, and a density of 1.65g/cm at a temperature of 200 ℃ 3 。
Example 3
In this embodiment, the ultra-light magnesium-lithium alloy with high strength and high creep resistance and the preparation method thereof mainly include the following steps:
i), magnesium-lithium alloy composition adopted and smelting
The cast Mg-Li-Gd magnesium-lithium alloy comprises the following chemical components in percentage by weight: 6% of Li, 9% of Gd and the balance of Mg. Refer to the compounding and smelting methods of example 1.
II) homogenization treatment process
And (3) preserving the temperature of the as-cast Mg-Li-Gd magnesium lithium alloy at 520 ℃ for 24 hours, and then quenching with water and cooling to room temperature.
III) aging treatment process
And (3) carrying out artificial aging treatment on the homogenized Mg-Li-Gd magnesium-lithium alloy at the temperature of 220 ℃ for 36 hours, and then carrying out water quenching and cooling to room temperature.
IV) microstructural characterization
Microstructure characterization of reference example 1.
The true bookIn the examples, the Mg-Gd intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 6%.
V) high temperature mechanical property test
Mechanical properties test of reference example 1. In the present example, the material containing the lithium-magnesium alloy had a tensile strength of 68MPa, a yield strength of 45MPa, an elongation of δ 70%, and a density of 1.65g/cm at a temperature of 300 ℃ 3 。
The embodiment result shows that the high-temperature mechanical property of the magnesium-lithium alloy can be obviously improved, the high-temperature mechanical strength is still high under the high-temperature condition of 100-350 ℃, and the practical engineering application of the magnesium-lithium alloy is widened. The alloy is smelted and the product is formed by subsequent heat treatment, the equipment used in the invention is simple, the treatment process flow is simple, the cost is lower, and the operation is simple and convenient.
Claims (7)
1. The ultra-light magnesium-lithium alloy with high strength and high creep resistance is characterized in that the magnesium-lithium alloy is Mg-Li-Gd ternary magnesium-lithium alloy, and the components and the contents thereof are as follows by weight percent: the content of lithium is 5-12%, and the content of gadolinium is 8-15%; the balance of the magnesium content is balance.
2. The ultra-light magnesium-lithium alloy with high strength and high creep resistance as claimed in claim 1, which is suitable for quasicrystal strengthening Mg-Li-Gd magnesium-lithium alloy with an alpha-Mg hexagonal close packed structure (HCP) as a matrix, a beta-Li body-centered cubic structure (BCC) as a matrix or an (alpha-Mg + beta-Li) dual phase as a matrix.
3. The ultra-light Mg-Li alloy with high strength and high creep resistance as claimed in claim 1, wherein in the Mg-Li alloy, the Mg-Gd intermetallic compound with high temperature resistance is formed in the shape of cells at the grain boundary of the matrix, and the average diameter of the cells is less than 150 μm.
4. The ultra-light magnesium-lithium alloy with high strength and high creep resistance as claimed in claim 1, wherein the volume fraction of the reticulated high temperature resistant magnesium gadolinium intermetallic compound formed at the grain boundary of the matrix in the magnesium-lithium alloy is 20-60%.
5. The ultra-light Mg-Li alloy with high strength and high creep resistance as claimed in claim 4, wherein the Mg-Gd intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 5-10%.
6. A method for preparing the ultra-light Mg-Li alloy with high strength and high creep resistance according to any one of claims 1 to 5, wherein the Mg-Li alloy is heat-treated by the following steps: firstly, homogenizing treatment is carried out for 5-50 hours at the temperature of 500-540 ℃, and water quenching and cooling are carried out to room temperature; and carrying out aging treatment at the temperature of 180-220 ℃ for 10-80 hours, and cooling to room temperature by water quenching to form fine dispersion strengthening precipitated phases with the size less than 5 microns in the crystal.
7. The method for preparing the ultra-light magnesium-lithium alloy with high strength and high creep resistance according to claim 6, wherein the performance indexes of the magnesium-lithium alloy are as follows: tensile strength (sigma) at a temperature of 100 to 350 DEG C UTS ) 40 to 280MPa, yield strength (sigma) 02 ) 25 to 210MPa, an elongation (delta) of 20 to 80%, and a density of 1.46 to 1.91g/cm 3 。
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| CN104928550A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof |
| US20170369972A1 (en) * | 2015-01-27 | 2017-12-28 | Santoku Corporation | Magnesium-lithium alloy, rolled material and shaped article |
| CN109022985A (en) * | 2018-09-26 | 2018-12-18 | 浙江海洋大学 | A kind of high-intensitive, two-phase (alpha+beta phase) magnesium lithium alloy material of high-ductility and preparation method thereof |
| CN112111682A (en) * | 2020-07-28 | 2020-12-22 | 北京工业大学 | Beta based on island shape1High-performance deformation rare earth magnesium lithium alloy reinforced by nano precipitated phase |
| CN112195421A (en) * | 2020-09-07 | 2021-01-08 | 北京工业大学 | Island-shaped beta in rare earth magnesium-lithium alloy1Method for separating out nanophase |
| CN113355574A (en) * | 2021-05-05 | 2021-09-07 | 北京工业大学 | High-strength high-toughness magnesium-lithium alloy capable of being rapidly aged and strengthened and preparation method thereof |
| CN114150195A (en) * | 2021-12-07 | 2022-03-08 | 北京工业大学 | High-performance rare earth magnesium lithium alloy plate and preparation method thereof |
| CN114411030A (en) * | 2022-01-21 | 2022-04-29 | 重庆大学 | High-plasticity magnesium alloy and preparation method thereof |
-
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- 2022-05-06 CN CN202210489264.2A patent/CN114959390B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| US20170369972A1 (en) * | 2015-01-27 | 2017-12-28 | Santoku Corporation | Magnesium-lithium alloy, rolled material and shaped article |
| CN104928550A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof |
| CN109022985A (en) * | 2018-09-26 | 2018-12-18 | 浙江海洋大学 | A kind of high-intensitive, two-phase (alpha+beta phase) magnesium lithium alloy material of high-ductility and preparation method thereof |
| CN112111682A (en) * | 2020-07-28 | 2020-12-22 | 北京工业大学 | Beta based on island shape1High-performance deformation rare earth magnesium lithium alloy reinforced by nano precipitated phase |
| CN112195421A (en) * | 2020-09-07 | 2021-01-08 | 北京工业大学 | Island-shaped beta in rare earth magnesium-lithium alloy1Method for separating out nanophase |
| CN113355574A (en) * | 2021-05-05 | 2021-09-07 | 北京工业大学 | High-strength high-toughness magnesium-lithium alloy capable of being rapidly aged and strengthened and preparation method thereof |
| CN114150195A (en) * | 2021-12-07 | 2022-03-08 | 北京工业大学 | High-performance rare earth magnesium lithium alloy plate and preparation method thereof |
| CN114411030A (en) * | 2022-01-21 | 2022-04-29 | 重庆大学 | High-plasticity magnesium alloy and preparation method thereof |
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