CN114959390B - Ultra-light magnesium-lithium alloy with high strength and high creep resistance and preparation method thereof - Google Patents
Ultra-light magnesium-lithium alloy with high strength and high creep resistance and preparation method thereof Download PDFInfo
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- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 72
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000011777 magnesium Substances 0.000 claims abstract description 40
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 23
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 21
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000006185 dispersion Substances 0.000 claims abstract description 13
- 238000005728 strengthening Methods 0.000 claims abstract description 13
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910017863 MgGd Inorganic materials 0.000 claims description 17
- 230000032683 aging Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- DFIYZNMDLLCTMX-UHFFFAOYSA-N gadolinium magnesium Chemical compound [Mg].[Gd] DFIYZNMDLLCTMX-UHFFFAOYSA-N 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- 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
- 239000000463 material Substances 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 238000012512 characterization method Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000000518 rheometry Methods 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 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
- 230000001276 controlling effect Effects 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
- 238000000227 grinding 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
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect 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
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000203 mixture 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
Classifications
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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
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the field of magnesium-lithium alloy, in particular to an ultra-light magnesium-lithium alloy with high strength and high creep resistance 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, and form a network cell-shaped (average diameter smaller than 150 microns) high-temperature resistant intermetallic compound with volume fraction of 20-60% at a grain boundary of a matrix by reasonably selecting alloy elements, and form a fine (smaller than 5 microns) dispersion strengthening precipitated phase in the crystal, thereby preparing the magnesium-lithium alloy with higher mechanical strength and high creep resistance at a high temperature of 100-350 ℃. The preparation method of the invention is applicable to the alloy and comprises the following components: according to weight percentage, lithium (Li) is 5-12%, gadolinium (Gd) is 8-15%, and magnesium (Mg) is the rest. The invention can obviously improve the high-temperature mechanical property of the magnesium-lithium alloy and widens the practical engineering application of the magnesium-lithium alloy.
Description
Technical Field
The invention relates to the field of magnesium-lithium alloy, in particular to an ultra-light magnesium-lithium alloy with high strength and creep resistance and a preparation method thereof, and particularly 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
Heretofore, magnesium-lithium alloys have been the lightest metallic structural materials with densities of 1.35 to 1.65g/cm 3 The composite material has the characteristics of high specific strength and specific rigidity, strong cold and hot deformation capability, unobvious anisotropy, good low-temperature performance and the like, and is an ideal light structural material in the fields of aerospace, aviation, electronics, military and the like. However, the magnesium-lithium alloy has the defects of low absolute strength, poor high temperature resistance, poor creep resistance, poor corrosion resistance and the like, and severely restricts the application and further development of the alloy. Literature (mater. Sci. Eng. A. (materials science and engineering) 528 (2011) 6157) reports that the tensile strength of a dual-phase magnesium lithium alloy is only 2 to 10MPa at a temperature of 200 to 300 ℃, mainly because the matrix phase is extremely easy to generate large plastic rheology under high temperature conditions. Based on the above, in order to improve the high temperature mechanical property and creep resistance of the magnesium-lithium alloyThe ability to form network-like refractory intermetallic compounds around the matrix phase is required to effectively hinder plastic rheology of the matrix phase under high temperature conditions. According to the binary phase diagram of Mg-Gd, the MgGd alloy phase formed in the alloy has higher melting point, wherein Mg 5 Gd、Mg 3 Gd、Mg 2 The initial melting temperatures of Gd and MgGd were 548, 658, 720 and 756, respectively. In addition, the addition of Li does not form intermetallic compounds with Gd. Thus, mgGd phases with high melting points 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 deformation of the matrix phase can be completely and effectively inhibited, the high-temperature mechanical strength and creep resistance of the magnesium-lithium alloy are further improved, and a new solution is provided for improving and expanding the temperature application range of the magnesium-lithium alloy.
Disclosure of Invention
The invention aims to provide an ultra-light magnesium-lithium alloy with high strength and creep resistance 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, and form a network cell-shaped high-temperature resistant intermetallic compound at the grain boundary of a matrix by reasonably selecting alloy elements, and form a fine dispersion strengthening precipitated phase in the crystal, so as to prepare the magnesium-lithium alloy with higher mechanical strength and high creep resistance at the high temperature 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 lithium content is 5-12%, and the gadolinium content is 8-15%; the balance of magnesium content.
The ultra-light magnesium lithium alloy with high strength and high creep resistance is suitable for quasicrystal reinforced Mg-Li-Gd magnesium lithium alloy with 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 ultra-light magnesium-lithium alloy with high strength and high creep resistance, a network cell-shaped high-temperature-resistant magnesium-gadolinium intermetallic compound is formed at the grain boundary of a matrix, and the average diameter of the network cell is smaller than 150 microns.
In the ultra-light magnesium-lithium alloy with high strength and high creep resistance, the volume fraction of the network cell-shaped high-temperature-resistant magnesium-gadolinium intermetallic compound formed at the grain boundary of the matrix is 20-60%.
The ultra-light magnesium-lithium alloy with high strength and high creep resistance has Mg as the intermetallic compound of magnesium and gadolinium 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd is 5-10%.
The preparation method of the ultra-light magnesium-lithium alloy with high strength and high creep resistance comprises the following heat treatment process of the magnesium-lithium alloy: homogenizing at 500-540 deg.c for 5-50 hr, water quenching and cooling to room temperature; then aging treatment is carried out for 10 to 80 hours at the temperature of 180 to 220 ℃, water quenching is carried out, and the temperature is cooled to room temperature, so that fine dispersion strengthening precipitated phases are formed in crystals, and the size of the fine dispersion strengthening precipitated phases is smaller than 5 microns.
The performance indexes of the ultra-light magnesium-lithium alloy with high strength and high creep resistance are as follows: tensile strength (. Sigma.) at a temperature of 100 to 350 ℃C UTS ) 40-280 MPa, yield strength (sigma) 0.2 ) 25-210 MPa, elongation (delta) of 20-80% and density of 1.46-1.91 g/cm 3 。
The design idea of the invention is as follows:
for a Mg-Li-Gd ternary magnesium-lithium alloy, the lithium element in the alloy does not form intermetallic compounds with magnesium and gadolinium elements. Meanwhile, magnesium and gadolinium can form MgGd alloy phases with higher melting points. Wherein Mg is 5 Gd、Mg 3 Gd、Mg 2 The initial melting temperatures of Gd and MgGd were 548, 658, 720 and 756, respectively. According to the invention, through reasonably regulating and controlling the addition amount of rolling in the magnesium-lithium alloy, a certain volume fraction of net-like high-temperature resistant MgGd intermetallic compound is formed around the grain boundary of the matrix, so that the plastic rheology of the matrix phase under the high-temperature condition can be effectively prevented. In addition, the dispersion strengthening precipitated phase is precipitated in the crystal by high-temperature aging, so that the dislocation movement in the crystal can be effectively pinned. Dual action based on network cell high-melting point intermetallic compound formed at grain boundary and intra-crystal aging precipitation dispersion strengthening phaseThe high-temperature mechanical strength and creep resistance of the magnesium-lithium alloy can be obviously improved, and the high-end requirements of the industries such as aerospace, military industry, automobiles and the like on lightweight 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 net-like high-temperature-resistant MgGd intermetallic compound is formed at the grain boundary of the matrix, and meanwhile, a fine dispersion strengthening precipitated phase is formed in the crystal, so that the plastic rheology of the matrix phase under the high-temperature condition is effectively prevented, and the dislocation movement in the crystal is effectively pinned.
2. The magnesium-lithium alloy with low density, high temperature mechanical strength and creep resistance is obtained by the method, is particularly suitable for the requirements of light, 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 low-magnification photograph of a Mg-Li-Gd magnesium-lithium alloy, reflecting the morphology, cell size and volume fraction (example 1, example 2 and example 3) of a network-like high temperature resistant intermetallic compound distributed at grain boundaries in a matrix.
FIG. 2 is a high-magnification photograph of a Mg-Li-Gd magnesium-lithium alloy, showing the morphology details of the network-like high-temperature-resistant intermetallic compound at the grain boundary and the morphology, distribution and size (example 1, example 2 and example 3) of the dispersion-strengthened phase precipitated in the crystal.
Detailed Description
In the specific implementation process, the magnesium-lithium alloy with higher mechanical strength and high creep resistance at the high temperature of 100-350 ℃ is prepared by reasonably selecting alloy elements, forming a high-temperature resistant magnesium-gadolinium intermetallic compound with the volume fraction of 20-60% (the average diameter is smaller than 150 microns, preferably 80-100 microns) at the grain boundary of a matrix, and forming a fine (smaller than 5 microns, preferably 1-3 microns) dispersion strengthening precipitated phase in the crystal. The preparation method of the invention is applicable to alloy comprising the following components in percentage by weight: 5 to 12 percent of lithium (Li), preferably 6 to 8 percent, 8 to 15 percent of gadolinium (Gd), preferably 10 to 13 percent, and the balance of magnesium (Mg).
The invention will be further illustrated with reference to specific examples, which are given to illustrate, but not to limit, the invention and the scope of protection thereof is not limited to the specific examples carried out below.
Example 1
In this embodiment, the ultra-light magnesium lithium alloy with high strength and high creep resistance and the preparation method thereof mainly comprise the following steps:
i), magnesium-lithium alloy components adopted and smelting
The cast Mg-Li-Gd magnesium-lithium alloy comprises the following chemical components in percentage by weight: 8% Li,13% Gd, and the balance Mg. The raw materials are weighed out as follows: lithium (Li), zinc (Zn), magnesium gadolinium intermediate alloy (Mg-25 wt% Gd) and the balance magnesium (Mg). Using a vacuum resistance furnace, 7.3 kg of high purity magnesium (purity: 99.95 wt%), 0.9 kg of high purity lithium (purity: 99.99 wt%) and 7.8 kg of magnesium gadolinium intermediate alloy (Mg-25 wt% gd) were charged into a crucible in the furnace in a composition ratio of 15 kg of total ingredients. Vacuumizing the furnace to a vacuum degree of 2.0X10 -2 At Pa, argon gas is filled into the furnace to 9.5X10 4 Pa, then heating up the furnace, heating up the furnace to 720 ℃ and preserving heat for 1 hour, and stirring the furnace. And standing for 30 minutes, casting in a furnace, cooling to room temperature, taking out an ingot, and completing alloy smelting.
II) homogenization treatment process
And (3) preserving the heat of the as-cast Mg-Li-Gd magnesium-lithium alloy for 40 hours at 530 ℃, and then quenching with water to cool to room temperature.
III) aging treatment process
And (3) carrying out artificial aging treatment on the Mg-Li-Gd magnesium-lithium alloy subjected to homogenization treatment at the temperature of 210 ℃ for 24 hours, and then cooling to room temperature by water quenching.
IV) microstructure 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 an alloy sample is as follows: grinding the surface by using No. 1000 silicon carbide abrasive paper; mechanically polishing by adopting oil-based diamond grinding paste; the morphology of the network cell-shaped high-temperature resistant intermetallic compound distributed at the grain boundary in the 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. The average size of the dispersion strengthening phase which is precipitated in crystals and distributed in the Mg-Li-Gd magnesium-lithium alloy matrix after aging is 2 microns, as shown in figure 2.
In this embodiment, the magnesium gadolinium intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd was 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 4mm. Strain rate of 1×10 in tensile test -3 s -1 . The tensile test was performed on a MTS (858.01M) tension torsion tester. In this example, the material of the lithium-containing magnesium alloy has a tensile strength of 210MPa, a yield strength of 156MPa, an elongation of δ=25% and a density of 1.65g/cm at 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 comprise the following steps:
i), magnesium-lithium alloy components 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. Reference is made to the batch 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 with water and cooling to room temperature.
III) aging treatment process
And (3) carrying out artificial aging treatment on the Mg-Li-Gd magnesium-lithium alloy subjected to homogenization treatment at the temperature of 200 ℃ for 48 hours, and then cooling to room temperature by water quenching.
IV) microstructure characterization
Microstructure characterization of reference example 1.
In this embodiment, the magnesium gadolinium intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd was 7%.
V) high temperature mechanical property test
Reference example 1 was tested for mechanical properties. In this example, the material of the lithium-containing magnesium alloy has a tensile strength of 150MPa, a yield strength of 102MPa, an elongation of δ=39% and a density of 1.65g/cm at 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 comprise the following steps:
i), magnesium-lithium alloy components adopted and smelting
The cast Mg-Li-Gd magnesium-lithium alloy comprises the following chemical components in percentage by weight: 6% Li,9% Gd, and the balance Mg. Reference is made to the batch 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 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 Mg-Li-Gd magnesium-lithium alloy subjected to homogenization treatment at 220 ℃ for 36 hours, and then cooling to room temperature by water quenching.
IV) microstructure characterization
Microstructure characterization of reference example 1.
In this embodiment, the magnesium gadolinium intermetallic compound is Mg 5 Gd、Mg 3 Gd、Mg 2 Gd and MgGd, wherein: the volume fraction of MgGd was 6%.
V) high temperature mechanical property test
Reference example 1 was tested for mechanical properties. In this example, the material of the lithium-containing magnesium alloy has a tensile strength of 68MPa, a yield strength of 45MPa, an elongation of δ=70% and a density of 1.65g/cm at 300 ℃ 3 。
The results of the examples show that the invention can obviously improve the high-temperature mechanical properties of the magnesium-lithium alloy, has higher mechanical strength under the high-temperature condition of 100-350 ℃, and widens the practical engineering application of the magnesium-lithium alloy. The alloy is smelted and then heat treated to form the product, and the invention has the advantages of simple equipment, simple treatment process flow, low cost and simple and convenient operation.
Claims (2)
1. The ultra-light magnesium-lithium alloy with high strength and high creep resistance is characterized in that the magnesium-lithium alloy is a ternary magnesium-lithium alloy of Mg-Li-Gd, and the components and the contents thereof are as follows in percentage by weight: the lithium content is 5-12%, and the gadolinium content is 9-15%; the magnesium content is balance;
in the magnesium-lithium alloy, a network cell-shaped high-temperature-resistant magnesium-gadolinium intermetallic compound is formed at the grain boundary of the matrix, and the average diameter of the network cell is smaller than 150 microns;
in the magnesium-lithium alloy, the volume fraction of the network cell-shaped high-temperature-resistant magnesium-gadolinium intermetallic compound formed at the grain boundary of the matrix is 20-60%;
the preparation method of the ultra-light magnesium-lithium alloy with high strength and high creep resistance comprises the following heat treatment process of the magnesium-lithium alloy: homogenizing the cast Mg-Li-Gd magnesium-lithium alloy at 500-540 ℃ for 5-50 hours, quenching with water and cooling to room temperature; then aging treatment is carried out for 10 to 80 hours at the temperature of 180 to 220 ℃, water quenching is carried out, and the temperature is cooled to room temperature, so that fine dispersion strengthening precipitated phases are formed in crystals, and the size of the fine dispersion strengthening precipitated phases is smaller than 5 microns;
the performance indexes of the magnesium-lithium alloy are as follows: tensile strength (. Sigma.) at a temperature of 100 to 350 ℃C UTS ) 40-280 MPa, yield strength (sigma) 0.2 ) 25-210 MPa, elongation (delta) of 20-80% and density of 1.46-1.91 g/cm 3 ；
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 as a matrix, a beta-Li body-centered cubic structure as a matrix or (alpha-Mg+beta-Li) double phases as a matrix;
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%.
2. A method for preparing the ultra-light magnesium-lithium alloy with high strength and high creep resistance according to claim 1, wherein the heat treatment process of the magnesium-lithium alloy is as follows: homogenizing the cast Mg-Li-Gd magnesium-lithium alloy at 500-540 ℃ for 5-50 hours, quenching with water and cooling to room temperature; then aging treatment is carried out for 10 to 80 hours at the temperature of 180 to 220 ℃, water quenching is carried out, and the temperature is cooled to room temperature, so that fine dispersion strengthening precipitated phases are formed in crystals, and the size of the fine dispersion strengthening precipitated phases is smaller than 5 microns.
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Citations (8)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3556876A1 (en) * | 2015-01-27 | 2019-10-23 | Santoku Corporation | Magnesium-lithium alloy, rolled material and shaped article |
-
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Patent Citations (8)
| 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 |
| 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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