CN114632937A - High-strength ZK60 magnesium alloy, magnesium-based composite material and preparation method - Google Patents
High-strength ZK60 magnesium alloy, magnesium-based composite material and preparation method Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 73
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 239000011777 magnesium Substances 0.000 title claims abstract description 33
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 50
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000001192 hot extrusion Methods 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 33
- 238000005245 sintering Methods 0.000 claims description 25
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000002113 nanodiamond Substances 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 17
- 238000000498 ball milling Methods 0.000 claims description 14
- 238000001291 vacuum drying Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000007731 hot pressing Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 4
- 238000004663 powder metallurgy Methods 0.000 abstract description 3
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910016523 CuKa Inorganic materials 0.000 description 1
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
In order to solve the technical problem of low strength of the existing magnesium alloy preparation method, the invention provides a high-strength ZK60 magnesium alloy, a magnesium-based composite material and a preparation method thereof. The high-strength ZK60 magnesium alloy is composed of the following three ZK60 alloy powders with different grain diameters and mass proportions, wherein 25-45 mu m accounts for 20-30%, 45-75 mu m accounts for 40-60%, and 75-150 mu m accounts for 20-30%. On the basis of preparing the magnesium alloy and the composite material by the powder metallurgy method, the invention combines the hot extrusion process to further refine the grain sizes of the magnesium alloy and the composite material, thereby preparing the high-performance magnesium alloy and the composite material thereof and expanding the application range of the magnesium alloy and the magnesium-based composite material. The yield strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material prepared by the invention is up to more than 250MPa, the tensile strength is up to more than 340MPa, and the strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material is greatly superior to that of the magnesium alloy and magnesium-based composite material prepared by the prior art.
Description
Technical Field
The invention relates to the technical field of magnesium alloy preparation, in particular to a high-strength ZK60 magnesium alloy, a magnesium-based composite material and a preparation method thereof.
Background
At present, the magnesium alloy material prepared by using the traditional casting process has many problems, such as low strength, uneven components, a large amount of gaps and cracks and the like, so that the application of the magnesium alloy in the fields of aerospace, electronic 3C, automobile industry and the like is limited. Compared with a casting method, the magnesium alloy prepared by the powder metallurgy method has the following advantages: raw materials are saved, the preparation cost is low, and the dimensional stability of the material is relatively good. However, it also has a relatively important problem that although the strength is improved compared with the magnesium alloy prepared by casting process, the strength is far from meeting the requirements for developing high-performance magnesium alloy (yield strength is more than 200MPa, tensile strength is more than 300 MPa), and the reason why the strength requirement does not meet the required standard is because the grain size is larger.
Disclosure of Invention
In order to solve the technical problem of low strength of the existing magnesium alloy preparation method, the invention provides a high-strength ZK60 magnesium alloy, a magnesium-based composite material and a preparation method thereof.
The invention provides a high-strength ZK60 magnesium alloy, which consists of the following three ZK60 alloy powders with different grain diameters and mass proportions, wherein 25-45 mu m accounts for 20-30%, 45-75 mu m accounts for 40-60%, and 75-150 mu m accounts for 20-30%.
The invention also provides a preparation method of the high-strength ZK60 magnesium alloy, which comprises the following steps:
s1, putting the ZK60 alloy powder with three different particle sizes and the absolute ethyl alcohol solution into a grinding tank, and performing ball milling for 1-3h at the rotating speed of 100-300rpm in the atmosphere of high-purity Ar;
s2, drying the alloy powder subjected to ball milling in a vacuum drying oven;
s3, putting the dried mixed alloy powder into a sintering mould, pre-compacting under the pressure of 15MPa, then sintering the mixed alloy powder under the constant pressure of 20-40MPa and Ar atmosphere by adopting a vacuum hot-pressing sintering furnace, and sintering at the temperature of 5-15 ℃ per minute-1The temperature rise rate is increased to 400-500 ℃, and the temperature is kept for 2-4 h;
s4, cutting the sintered sample into extrusion blanks, respectively carrying out preheating treatment on the blanks and an extrusion grinding tool before extrusion, carrying out heat preservation on the blanks at the temperature of 200-300 ℃ for 20-50min, carrying out heat preservation on an extrusion die at the temperature of 200-300 ℃ for 5-20min, and finally carrying out hot extrusion on the blanks at the extrusion speed of 10-30mm/S at the temperature of 200-300 ℃ by using a P32-315 four-column hydraulic press so as to ensure that the extrusion ratio is 25-30.
Optionally, the absolute ethanol in step S1 is analytically pure absolute ethanol.
Optionally, the vacuum drying conditions in step S2 are: 10-2Pa or less.
The invention also provides the magnesium-based composite material of the high-strength ZK60 magnesium alloy, wherein the composite material is prepared from the high-strength ZK60 magnesium alloy and nano diamond particles according to the mass ratio of 99.2-99.9: 0.1-0.8.
The invention also provides a preparation method of the magnesium-based composite material of the high-strength ZK60 magnesium alloy, which comprises the following steps:
s1, putting three ZK60 alloy powder with different grain sizes, nano diamond particles and absolute ethyl alcohol solution into a grinding tank, and ball-milling for 1-3h at the rotating speed of 100-300rpm under the atmosphere of high-purity Ar;
s2, drying the alloy powder subjected to ball milling in a vacuum drying oven;
s3, putting the dried mixed alloy powder into a sintering mould, pre-compacting under the pressure of 15MPa, then sintering the mixed alloy powder under the constant pressure of 20-40MPa and Ar atmosphere by adopting a vacuum hot-pressing sintering furnace, and sintering at the temperature of 5-15 ℃ per minute-1The temperature rise rate is increased to 400-500 ℃, and the temperature is kept for 2-4 h;
s4, cutting the sintered sample into an extrusion blank, respectively carrying out preheating treatment on the blank and an extrusion grinding tool before extrusion, carrying out heat preservation on the blank at 300 ℃ of 200-.
Optionally, the absolute ethanol in step S1 is analytically pure absolute ethanol.
Optionally, the vacuum drying conditions in step S2 are: 10-2Pa or less.
The invention combines the hot extrusion process to further refine the grain sizes of the magnesium alloy and the composite material on the basis of preparing the magnesium alloy and the composite material by the powder metallurgy method, thereby preparing the high-performance magnesium alloy and the composite material thereof and expanding the application range of the magnesium alloy and the magnesium-based composite material. The yield strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material prepared by the invention is up to more than 250MPa, the tensile strength is up to more than 340MPa, and the strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material is greatly superior to that of the magnesium alloy and magnesium-based composite material prepared by the prior art.
Drawings
FIG. 1 is an X-ray diffraction (XRD) spectrum of a ZK60 magnesium alloy prepared by an example;
FIG. 2 is an SEM image of ZK60 magnesium alloy: (a) is SEM image of ZK60 magnesium alloy under 2000X magnification; (b) is SEM image of ZK60 magnesium alloy under 5000X multiplying power
FIG. 3 is a graph of quasi-static tensile stress-strain curve and compressive stress-strain curve for ZK60 magnesium alloy.
Fig. 4 is an OM diagram of a nanodiamond-enhanced ZK60 magnesium-based composite material.
Fig. 5 is a quasi-static tensile stress-strain curve and a compressive stress-strain curve of the nano-diamond enhanced ZK60 magnesium-based composite material.
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, so that how to implement the technical features of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Example 1
A high-strength ZK60 magnesium alloy is composed of the following three ZK60 alloy powders with different grain sizes and mass proportions, wherein 25-45 μm accounts for 25%, 45-75 μm accounts for 50% and 75-150 μm accounts for 25%.
A magnesium-based composite material, which is prepared from the high-strength ZK60 magnesium alloy and nano diamond particles according to the mass ratio of 99.75: 0.25.
The preparation method of the high-strength ZK60 magnesium alloy comprises the following steps:
s1, putting 25g of ZK60 alloy powder with the particle size of 25-45 microns, 50g of ZK60 alloy powder with the particle size of 45-75 microns, 25g of ZK60 alloy powder with the particle size of 75-150 microns and a certain amount of absolute ethyl alcohol solution into a grinding tank, and carrying out ball milling for 2 hours at the rotating speed of 200rpm under the atmosphere of high-purity Ar;
s2, ball-milling the alloy powder at 10-2Drying in a vacuum drying box below Pa;
s3, putting the dried mixed alloy powder into a sintering die, pre-compacting under the pressure of 15MPa, and then sintering the mixed alloy powder under the constant pressure of 30MPa and Ar atmosphere by using a vacuum hot-pressing sintering furnace at 10 ℃ min-1The temperature is raised to 450 ℃ at the temperature raising rate, and the temperature is kept for 3 hours;
s4, cutting the sintered sample into extruded blanks with the diameter and the height of 52mm and 36mm respectively. Respectively carrying out preheating treatment on the blank and an extrusion grinding tool before extrusion, keeping the temperature of the blank at 250 ℃ for 40min, keeping the temperature of an extrusion die at 250 ℃ for 10min, and finally carrying out hot extrusion on the blank by using a P32-315 four-column hydraulic press at 250 ℃ and an extrusion speed of 20mm/s so as to extrude the blank from the diameter of 52mm to the diameter of 10mm (the extrusion ratio is 27).
In the preparation method of the magnesium-based composite material, 25g of ZK60 alloy powder with the particle size of 25-45 microns, 50g of ZK60 alloy powder with the particle size of 45-75 microns, 25g of ZK60 alloy powder with the particle size of 75-150 microns, 0.25g of nano diamond particles and a certain amount of absolute ethyl alcohol solution are put into a grinding tank in step S1 and are ball-milled for 2 hours at the rotating speed of 200rpm in the atmosphere of high-purity Ar; the other steps are the same as the preparation method of the high-strength ZK60 magnesium alloy.
Example 2
A high-strength ZK60 magnesium alloy is composed of the following three ZK60 alloy powders with different grain sizes and mass proportions, wherein 25-45 μm accounts for 30%, 45-75 μm accounts for 40%, and 75-150 μm accounts for 30%.
A magnesium-based composite material, which is prepared from the high-strength ZK60 magnesium alloy and nano diamond particles according to the mass ratio of 99.2: 0.8.
The preparation method of the high-strength ZK60 magnesium alloy comprises the following steps:
s1, putting 30g of ZK60 alloy powder with the particle size of 25-45 microns, 40g of ZK60 alloy powder with the particle size of 45-75 microns, 30g of ZK60 alloy powder with the particle size of 75-150 microns and a certain amount of absolute ethyl alcohol solution into a grinding tank, and carrying out ball milling for 3 hours at the rotating speed of 100rpm under the atmosphere of high-purity Ar;
s2, ball-milling the alloy powder at 10-2Drying in a vacuum drying box below Pa;
s3, putting the dried mixed alloy powder into a sintering die, pre-compacting under the pressure of 15MPa, and then sintering the mixed alloy powder under the constant pressure of 20MPa and Ar atmosphere by using a vacuum hot-pressing sintering furnace at the temperature of 15 ℃ per minute-1The temperature is raised to 400 ℃ at the temperature raising rate, and the temperature is kept for 4 hours;
s4, cutting the sintered sample into extruded blanks with the diameter and the height of 52mm and 36mm respectively. Respectively carrying out preheating treatment on the blank and the extrusion grinding tool before extrusion, keeping the temperature of the blank at 200 ℃ for 50min, keeping the temperature of the extrusion die at 200 ℃ for 20min, and finally carrying out hot extrusion on the blank by using a P32-315 four-column hydraulic press at the extrusion speed of 250 ℃ and 20mm/s, wherein the extrusion ratio is 25.
In the preparation method of the magnesium-based composite material, in step S1, 30g of ZK60 alloy powder with the particle size of 25-45 microns, 40g of ZK60 alloy powder with the particle size of 45-75 microns, 30g of ZK60 alloy powder with the particle size of 75-150 microns, 0.81g of nano-diamond particles and a certain amount of absolute ethyl alcohol solution are put into a grinding tank and are ball-milled for 3 hours at the rotating speed of 100rpm in the atmosphere of high-purity Ar; the other steps are the same as the preparation method of the high-strength ZK60 magnesium alloy.
Example 3
A high-strength ZK60 magnesium alloy is composed of the following three ZK60 alloy powders with different grain sizes and mass proportions, wherein 25-45 μm accounts for 20%, 45-75 μm accounts for 60%, and 75-150 μm accounts for 20%.
A magnesium-based composite material, which is prepared from the high-strength ZK60 magnesium alloy and nano diamond particles according to the mass ratio of 99.9: 0.1.
The preparation method of the high-strength ZK60 magnesium alloy comprises the following steps:
s1, putting 20g of ZK60 alloy powder with the particle size of 25-45 microns, 60g of ZK60 alloy powder with the particle size of 45-75 microns, 20g of ZK60 alloy powder with the particle size of 75-150 microns and a certain amount of absolute ethyl alcohol solution into a grinding tank, and carrying out ball milling for 1h at the rotating speed of 300rpm under the atmosphere of high-purity Ar;
s2, ball-milling the alloy powder at 10-2Drying in a vacuum drying box below Pa;
s3, putting the dried mixed alloy powder into a sintering mould, pre-compacting under the pressure of 15MPa, and sintering under the constant pressure of 40MPa and Ar atmosphere by adopting a vacuum hot-pressing sintering furnace at the temperature of 5 ℃ min-1The temperature is raised to 500 ℃ at the temperature raising rate, and the temperature is kept for 2 hours;
s4, cutting the sintered sample into extruded blanks with the diameter and the height of 52mm and 36mm respectively. Respectively carrying out preheating treatment on the blank and the extrusion grinding tool before extrusion, keeping the temperature of the blank at 300 ℃ for 20min, keeping the temperature of the extrusion die at 300 ℃ for 5min, and finally carrying out hot extrusion on the blank by using a P32-315 four-column hydraulic press at the extrusion speed of 300 ℃ and 10mm/s to ensure that the extrusion ratio is 30.
In the preparation method of the magnesium-based composite material, in step S1, 20g of ZK60 alloy powder with the particle size of 25-45 microns, 60g of ZK60 alloy powder with the particle size of 45-75 microns, 20g of ZK60 alloy powder with the particle size of 75-150 microns, 0.1g of nano diamond particles and a certain amount of absolute ethyl alcohol solution are put into a grinding tank and are ball-milled for 2 hours at the rotating speed of 200rpm in the atmosphere of high-purity Ar; the other steps are the same as the preparation method of the high-strength ZK60 magnesium alloy.
The texture structure and mechanical properties of the magnesium alloy and the composite material prepared in example 1 were tested:
(1) phase analysis: the phase analysis was carried out using a D/MAX 2500PC X-ray diffractometer from Japan, operating voltage and current were 40KV and 200mA, respectively, and the X-ray source was CuKa (λ ═ 0.1542nm) radiation.
(2) And (3) microstructure: microstructural characterisation was carried out using an optical microscope model DMI3000M and a field emission Scanning Electron Microscope (SEM) model JSM-7900F.
(3) And (3) testing quasi-static tensile mechanical properties: room temperature quasi-static state is carried out by adopting CMT4305 type microcomputer electronic universal testerA tensile test, wherein the test sample is manufactured into an I-shaped piece sample according to the relevant regulations in the national standard of the metal material room temperature tensile test method (GB/T228.1-2010), and the strain rate is 10-3s-1。
(4) Testing the mechanical properties of quasi-static compression: a CMT4305 type microcomputer electronic universal testing machine is adopted to carry out a room temperature quasi-static compression test, and a test sample is manufactured into a cylindrical sample with the diameter of 4mm and the height of 6mm according to the relevant regulations in the national standard of a metal material room temperature compression test method (GB 7314-87).
And (3) characterization results:
FIG. 1: it can be seen from the X-ray diffraction (XRD) pattern of ZK60 magnesium alloy of fig. 1 that: the ZK60 magnesium alloy is mainly composed of two phases, namely an alpha-Mg phase and MgZn phase2And (4) phase(s).
FIG. 2: fig. 2 shows SEM images of ZK60 magnesium alloy, wherein (a) is at 2000 magnifications and (b) is at 5000 magnifications. It can be seen from the graph (a) that the α -Mg phase is mainly composed of fine grains, not of fine grains and elongated deformed grains. In addition, the grain size of ZK60 magnesium alloy is very fine, well below 10 μm. To further determine the grain size of the ZK60 magnesium alloy, higher-power SEM images (figure (b)) were used for statistics and found to have an average grain size of 2.1 μm below the 5 μm limit, indicating that the process is capable of producing a super-fine grain structure of ZK60 magnesium alloy.
FIG. 3: fig. 3 shows the stress-strain curves for quasi-static tension and compression of ZK60 magnesium alloy. With respect to tensile mechanical properties, it can be seen that the ZK60 magnesium alloy has good tensile yield strength and tensile strength, and also has good elongation rates of 270.0MPa, 340.0MPa and 19.8%, respectively. For the compression performance, the ZK60 magnesium alloy also has good compressive yield strength and compressive strength, and has certain compression ratios of 263.0MPa, 570.0MPa and 14.0 percent respectively. In addition, the ratio of the compressive yield strength to the tensile yield strength is calculated and is found to be 0.96 and close to 1, which indicates that the tensile yield asymmetry is obviously improved, and the improvement on the tensile yield asymmetry is mainly due to the fact that the fine grain size (2.1 mu m) can inhibit the generation of {10-12} twin crystals in the compression process along the extrusion direction, so that the compressive yield strength is greatly increased, and the tensile yield strength is also prevented from being reduced, so that the tensile yield asymmetry is obviously improved, and the advantages of the process are further highlighted.
FIG. 4: fig. 4 shows the OM diagram of the nanodiamond-enhanced ZK60 magnesium-based composite. It can be seen from the figure that the mg-based composite material to which 0.25 wt% of the nanodiamond particles were added had an ultra-fine grain structure and the grain size was finer with respect to the extruded ZK60 magnesium alloy and the average grain size was 1.59 μm, which is much lower than the average grain size (2.1 μm) of the extruded alloy, indicating that the nanodiamond particles could further refine the grain size during the extrusion process.
FIG. 5: fig. 5 shows the stress-strain curves of quasi-static tension and compression of the nanodiamond-enhanced ZK60 magnesium-based composite material. As for tensile properties, by adding the nano-diamond particles, it was found that the compressive yield strength and tensile strength thereof could be significantly enhanced, but the elongation thereof was greatly reduced to 316.0MPa, 344.0MPa and 7.9%, respectively. The compressive yield strength is also significantly increased for the compressive properties, but decreased for the compressive strength, and the compressibility is also increased, 313.0MPa, 512.0MPa, and 16.7%, respectively. In addition, the ratio between the compressive yield strength and the tensile yield strength of the mg-based composite material was also calculated and found to be 0.99, indicating that the addition of 0.25 wt% of the nanodiamond not only increases the yield strength but also further improves the tensile-compressive yield strength.
To better highlight the advantages of the present invention, tensile properties were compared to AZ31 magnesium alloy prepared by hot press sintering in Liu super et al, as shown in the following table:
from the data, the yield strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material prepared by the invention is more than 280MPa, the tensile strength is more than 340MPa, and the strength of the high-strength ZK60 magnesium alloy and magnesium-based composite material is greatly superior to that of the magnesium alloy and magnesium-based composite material prepared by the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The high-strength ZK60 magnesium alloy is characterized in that the high-strength ZK60 magnesium alloy consists of the following three ZK60 alloy powders with different grain sizes and mass proportions, wherein the grain size is 25-45 mu m and accounts for 20-30%, the grain size is 45-75 mu m and accounts for 40-60%, and the grain size is 75-150 mu m and accounts for 20-30%.
2. The method of claim 1, wherein the ZK60 magnesium alloy comprises the following steps:
s1, putting the ZK60 alloy powder with three different particle sizes and the absolute ethyl alcohol solution into a grinding tank, and performing ball milling for 1-3h at the rotating speed of 100-300rpm in the atmosphere of high-purity Ar;
s2, drying the alloy powder subjected to ball milling in a vacuum drying oven;
s3, putting the dried mixed alloy powder into a sintering mould, pre-compacting under the pressure of 15MPa, then sintering the mixed alloy powder under the constant pressure of 20-40MPa and Ar atmosphere by adopting a vacuum hot-pressing sintering furnace, and sintering at the temperature of 5-15 ℃ per minute-1The temperature rise rate is increased to 400-500 ℃, and the temperature is kept for 2-4 h;
s4, cutting the sintered sample into an extrusion blank, respectively carrying out preheating treatment on the blank and an extrusion grinding tool before extrusion, carrying out heat preservation on the blank at 300 ℃ of 200-.
3. The method for preparing the ZK60 magnesium alloy as claimed in claim 2, wherein the absolute ethanol in the step S1 is analytically pure absolute ethanol.
4. The method for preparing ZK60 magnesium alloy according to claim 2, wherein the vacuum drying conditions in step S2 are: 10-2Pa or less.
5. The magnesium-based composite of a high-strength ZK60 magnesium alloy of claim 1, consisting of a high-strength ZK60 magnesium alloy and nanodiamond particles in a mass ratio of 99.2-99.9: 0.1-0.8.
6. The method of claim 5, wherein the method comprises the steps of:
s1, putting three ZK60 alloy powder with different grain sizes, nano diamond particles and absolute ethyl alcohol solution into a grinding tank, and ball-milling for 1-3h at the rotating speed of 100-300rpm under the atmosphere of high-purity Ar;
s2, drying the alloy powder subjected to ball milling in a vacuum drying oven;
s3, putting the dried mixed alloy powder into a sintering mould, pre-compacting under the pressure of 15MPa, then sintering the mixed alloy powder by adopting a vacuum hot-pressing sintering furnace under the constant pressure of 20-40MPa and Ar atmosphere at the temperature of 5-15 ℃ for min-1The temperature rise rate is increased to 400-500 ℃, and the temperature is kept for 2-4 h;
s4, cutting the sintered sample into extrusion blanks, respectively preheating the blanks and an extrusion grinding tool before extrusion, preserving the heat of the blanks at 200-300 ℃ for 20-50min, preserving the heat of the extrusion mould at 200-300 ℃ for 5-20min, and finally carrying out hot extrusion on the blanks at 200-300 ℃ and the extrusion speed of 10-30mm/S by using a P32-315 four-column hydraulic press so that the extrusion ratio is 25-30.
7. The method for preparing the magnesium-based composite material of the high-strength ZK60 magnesium alloy as recited in claim 6, wherein the absolute ethanol in the step S1 is analytically pure absolute ethanol.
8. The method of claim 6 wherein the high strength ZK60 magnesium based composite material is made fromCharacterized in that the vacuum drying conditions in the step S2 are as follows: 10-2Pa or less.
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