CN113528915B - Impact-resistant high-strength heat-resistant magnesium rare earth alloy material - Google Patents
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention discloses an impact-resistant high-strength heat-resistant magnesium rare earth alloy material which is characterized by comprising the following components in percentage by mass: 4-4.9% of Gd, 3.5-6.1% of Y and 0.81-1% of Zr, wherein the total content of Gd and Y rare earth elements is less than or equal to 11%, the total content of Al, Cu, Fe and Si impurity elements is not more than 0.1%, and the balance is pure Mg. The invention has the advantages that the invention provides the impact-resistant high-strength heat-resistant rare earth magnesium alloy material with high heat resistance and good impact resistance.
Description
Technical Field
The invention relates to non-ferrous metal materials and processing, in particular to an impact-resistant high-strength heat-resistant magnesium rare earth alloy material and a preparation method thereof.
Background
After the 21 st century, with the rapid development of science and technology, various emerging technologies are applied in a large number in conventional weapon systems, so that the military striking capability and the performance of a protection system are obviously improved, but the thicker the metal protective layer of the tank armored vehicle is, the more serious the cost and the weight are, and the maneuvering performance and the rapid response capability are also seriously influenced. Therefore, the magnesium alloy is the lightest metal structure material in engineering application, has the advantages of low density, high specific strength, high specific stiffness, good damping performance and the like, and has wide application prospect in the fields of aerospace, transportation, weaponry and the like. The light high-strength heat-resistant magnesium alloy is an ideal material for realizing the light weight of military equipment and improving various performance indexes of the military equipment, and is expected to gradually replace traditional metal armor materials such as steel, aluminum and the like to become a novel high-performance light armor material after a large amount of experimental researches. However, the magnesium alloy has the defects of low strength, low heat resistance and the like, which limits the application of the magnesium alloy. In order to meet the urgent need of lightweight materials in the aerospace and military armor field, how to improve the comprehensive mechanical property of magnesium alloy, and the development of heat-resistant magnesium alloy materials with excellent impact resistance becomes a hot theme of current research.
Disclosure of Invention
Based on the problems, aiming at the urgent need of service environments in the fields of aerospace, weaponry and the like for light alloys, the invention aims to provide an impact-resistant high-strength heat-resistant rare earth magnesium alloy material which has high strength and heat resistance and good impact resistance. The invention also aims to provide a preparation method of the impact-resistant high-strength heat-resistant magnesium rare earth alloy material, which has low production cost, high production efficiency and easy operation, so as to meet the existing industrial requirements. The technical scheme is realized in such a way that,
an impact-resistant high-strength heat-resistant magnesium rare earth alloy material comprises the following components in percentage by mass: 4-4.9% of Gd, 3.5-6.1% of Y and 0.81-1% of Zr, wherein the total content of Gd and Y rare earth elements is 11%, the total content of impurity elements such as Al, Cu, Fe and Si is not more than 0.1%, and the balance is pure Mg.
The preparation method of the impact-resistant high-strength heat-resistant magnesium rare earth alloy material comprises four parts of alloy casting, solution treatment, hot extrusion and aging treatment, and specifically comprises the following steps:
(1) casting of alloy: when the alloy is smelted, Mg element is added in the form of pure magnesium, Gd, Y and Zr elements are respectively added in the form of Mg-Gd, Mg-Y and Mg-Zr intermediate alloys, and the pure magnesium, the Mg-Gd, the Mg-Y and the Mg-Zr intermediate alloys are preheated and dried for later use at the temperature of 100-200 ℃ to ensure the safety of the experiment; putting the dried pure magnesium, Mg-Gd and Mg-Y into a crucible, and smelting in a smelting furnace at the temperature of 720-760 ℃; after the raw materials added into the crucible are completely melted, heating to 780-800 ℃, adding Mg-Zr intermediate alloy, adding a magnesium alloy refining agent for stirring and refining, and removing and cleaning impurities on the surface of the solution; and (3) standing the solution, adjusting the temperature to 720-750 ℃, pouring the solution into a steel mold, wherein the alloy components meet the requirement of the mass ratio, and protecting with protective gas in the whole casting process to obtain the round bar ingot.
(2) Solution treatment: placing the ingot obtained in the step (1) into a heating furnace, heating to 350-;
(3) hot extrusion deformation: and (3) carrying out solid solution homogenization treatment on the round bar ingot, and then carrying out hot extrusion molding on an extruder.
(4) Aging treatment: the material formed by hot extrusion is slowly heated to 180-250 ℃ from room temperature, and is subjected to aging treatment by keeping the temperature for 0.5-120h, thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy.
Further, in the step (1), the steel mold is preheated to 150 ℃ and 300 ℃ before use.
Further, in the step (1), after the pouring is finished, the mold is cooled by using a water-cooling mold.
Further, in the step (2), the temperature rise rate of the solution treatment is 5 to 20K/min, and the temperature rise rate of the solution treatment is more than 2K/min, preferably 2 to 10K/min.
Further, in the step (3), the diameter of the round bar ingot is 2-4mm smaller than that of the extrusion cylinder, the length is 1.5-2.5 times of the diameter, the heating temperature of the ingot is 470-500 ℃, and the heating time is 0.5-2 h; in the step (3), the temperature of the extrusion base is 200-300 ℃, and the temperature of the extrusion cylinder, the extrusion rod, the extrusion pad and the extrusion die is 250-450 ℃; in the step (3), the extrusion rate of the extrusion molding is 2-5mm/s, and the extrusion ratio is 3.75.
Further, in the step (4), the temperature of the extruded alloy is slowly raised from room temperature to 180-250 ℃, and the temperature is kept for 0.5-120h for aging treatment, wherein the temperature raising rate is 0.5-2K/min.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, by optimizing the alloy component design, the casting structure is obviously improved, the preparation process of the whole material is simple, and the operation is simple. The alloy material prepared by the technical route has obviously improved performance indexes such as strength, hardness, plasticity, toughness, heat resistance and the like, particularly has excellent impact resistance, the compressive strength is 610-700MPa, the yield strength is 520-560MPa, the elongation is 13-17.5 percent, and the performance indexes are comparable to those of the common armor aluminum alloy 2519A.
(2) When the alloy is subjected to hot extrusion forming, the requirements on equipment and temperature are not strict, and the industrialization degree is high; the invention carries out heating and heat preservation treatment on all extrusion tools, and controls certain extrusion speed, thereby preparing the material with fine grain size, having obvious fine grain strengthening effect and promoting the development of the magnesium alloy industry.
(3) The invention proposes a unique heat treatment scheme: the solid solution treatment adopts a mode of grading treatment and controlling the heating rate so as to improve the alloy performance, and the pre-precipitation treatment and the control of the heating rate can promote the precipitation of crystal boundaries and the vicinity of unbalanced eutectic crystal, promote the diffusion of a high solute atom concentration area and reduce the local solute atom concentration, thereby reducing the quantity of cubic rare earth-rich particles which are harmful to the mechanical property and are formed in the subsequent solid solution process; according to the invention, through slow temperature rise and aging, precipitation near the grain boundary can be promoted, the formation of a precipitate-free precipitation zone is effectively inhibited, the difference of the density of the grain boundary and an in-crystal precipitated phase is reduced, the properties of the grain boundary and the in-crystal phase are more balanced, and the mechanical property of the alloy is favorably improved.
Drawings
FIG. 1 is a scanning electron micrograph of an as-cast structure representative of the present invention;
FIG. 2 is a stress-strain curve of the impact-resistant high strength heat resistant magnesium rare earth alloy material of example 1 at room temperature under different impact loads.
FIG. 3 is a stress-strain curve of the impact-resistant high strength heat resistant magnesium rare earth alloy material of example 1 at 200 ℃ under different impact loads.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited thereto.
Example 1
(1) Alloy composition
The alloy comprises the following components in percentage by mass: gd 4%, Y3.5%, and Zr 0.81%; less than or equal to 0.02 percent of impurity element Al, less than or equal to 0.02 percent of Cu, less than or equal to 0.02 percent of Fe, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Si, and the balance of Mg.
(2) Alloy casting
After the ingredients are completely mixed, putting the weighed raw materials into a drying oven for drying for later use, wherein the temperature of the drying oven is 150 ℃; when the alloy is smelted, adding pure magnesium and intermediate alloys Mg-Gd and Mg-Y into a crucible to be heated and melted, heating to 780 ℃ after the pure magnesium and the intermediate alloys are completely melted, adding the Mg-Zr intermediate alloys, refining for 10 minutes after the Mg-Zr intermediate alloys are completely melted, slagging off, standing, cooling to 750 ℃, pouring the alloy liquid into a steel die preheated to 300 ℃, and adopting inert gas argon gas for protection during casting to obtain the round bar cast ingot. And after the pouring is finished, cooling the die by using a water-cooling die.
(3) Solution treatment
Placing the prepared cast ingot in a resistance heating furnace, heating to 400 ℃ and preserving heat for 8h, heating to 520 ℃ at the speed of 10K/min and preserving heat for 12h, and then performing water quenching;
(4) hot extrusion molding
Processing the diameter of a round bar ingot to be 30mm, the length of the round bar ingot to be 60mm, preserving the heat of the ingot in a heating furnace at 500 ℃ for 2h, preserving the heat of an extrusion base at 200 ℃ for 2h, preserving the heat of an extrusion cylinder, an extrusion rod, an extrusion pad and an extrusion die at 400 ℃ for 2 h; setting the extrusion speed to be 5mm/s and the extrusion ratio to be 3.75, and preparing the extruded alloy material;
(5) aging treatment
And (3) placing the extruded alloy material in a resistance heating furnace, heating to 210 ℃ at the speed of 1K/min, and preserving the heat for 16h (in an extrusion-T5 state), thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy material.
(6) Impact resistance
The high-strength magnesium alloy obtained in the example has good performance of resisting dynamic high-speed impact load, and the measurement shows that the high-strength magnesium alloy obtained in the example has good performance of resisting dynamic high-speed impact loadAlloy of (2), room temperature and strain rate of 2645s-1When the material is used, the compressive strength is 682MPa, the yield strength is 550MPa, and the elongation after fracture is 13.0 percent; 200 ℃ and a strain rate of 2578s-1The compressive strength was 629MPa, the yield strength was 536MPa, and the elongation after fracture was 17.0%.
Example 2
(1) Alloy composition
The alloy comprises the following components in percentage by mass: gd 4.2%, Y4%, Zr 0.86%; less than or equal to 0.02 percent of impurity element Al, less than or equal to 0.02 percent of Cu, less than or equal to 0.02 percent of Fe, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Si, and the balance of Mg.
(2) Alloy casting
After the ingredients are completely mixed, putting the weighed raw materials into a drying oven for drying for later use, wherein the temperature of the drying oven is 150 ℃; when the alloy is smelted, adding pure magnesium and intermediate alloys Mg-Gd and Mg-Y into a crucible to be heated and melted, heating to 780 ℃ after the pure magnesium and the intermediate alloys are completely melted, adding the Mg-Zr intermediate alloys, refining for 10 minutes after the Mg-Zr intermediate alloys are completely melted, slagging off, standing, cooling to 750 ℃, pouring the alloy liquid into a steel die preheated to 300 ℃, and protecting by adopting inert gas during casting to obtain the round bar cast ingot. And after the pouring is finished, cooling the die by using a water-cooling die.
(3) Solution treatment
Placing the prepared cast ingot in a resistance heating furnace, heating to 400 ℃ and preserving heat for 8h, heating to 520 ℃ at the speed of 10K/min and preserving heat for 12h, and then performing water quenching;
(4) hot extrusion molding
Processing the diameter of a round bar cast ingot to be 30mm, preserving the heat of the cast ingot in a heating furnace at 500 ℃ for 2h, preserving the heat of an extrusion base at 200 ℃ for 2h, and preserving the heat of an extrusion cylinder, an extrusion rod, an extrusion pad and an extrusion die for 2h at 400 ℃; setting the extrusion speed to be 5mm/s and the extrusion ratio to be 3.75, and preparing the extruded alloy material;
(5) aging treatment
And (3) placing the extruded alloy material in a resistance heating furnace, heating to 210 ℃ at the speed of 1K/min, and preserving the heat for 16h (in an extrusion-T5 state), thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy material.
(6) Impact resistance
The high-strength magnesium alloy obtained in the example has good performance of resisting dynamic high-speed impact load, and the alloy of the example is determined to have the room temperature and the strain rate of 2111s-1When the tensile strength is 646MPa, the yield strength is 512MPa, and the elongation after fracture is 14.2 percent; 200 ℃ and a strain rate of 2321s-1When the tensile strength is high, the compressive strength is 633MPa, the yield strength is 526MPa, and the elongation after fracture is 16.0 percent;
example 3
(1) Alloy composition
The alloy comprises the following components in percentage by mass: gd 4.4%, Y4.5%, Zr 0.9%; less than or equal to 0.02 percent of impurity element Al, less than or equal to 0.02 percent of Cu, less than or equal to 0.02 percent of Fe, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Si, and the balance of Mg.
(2) Alloy casting
After the ingredients are completely mixed, putting the weighed raw materials into a drying oven for drying for later use, wherein the temperature of the drying oven is 150 ℃; when the alloy is smelted, adding pure magnesium and intermediate alloys Mg-Gd and Mg-Y into a crucible to be heated and melted, heating to 780 ℃ after the pure magnesium and the intermediate alloys are completely melted, adding the Mg-Zr intermediate alloys, refining for 10 minutes after the Mg-Zr intermediate alloys are completely melted, slagging off, standing, cooling to 750 ℃, pouring the alloy liquid into a steel die preheated to 300 ℃, and adopting inert gas argon gas for protection during casting to obtain the round bar cast ingot.
(3) Solution treatment
Placing the prepared cast ingot in a resistance heating furnace, heating to 400 ℃ and preserving heat for 8h, heating to 520 ℃ at the speed of 10K/min and preserving heat for 12h, and then performing water quenching;
(4) hot extrusion molding
Processing the diameter of a round bar cast ingot to be 30mm, preserving the heat of the cast ingot in a heating furnace at 500 ℃ for 2h, preserving the heat of an extrusion base at 200 ℃ for 2h, and preserving the heat of an extrusion cylinder, an extrusion rod, an extrusion pad and an extrusion die for 2h at 400 ℃; setting the extrusion speed to be 5mm/s and the extrusion ratio to be 3.75, and preparing the extruded alloy material;
(5) aging treatment
And (3) placing the extruded alloy material in a resistance heating furnace, heating to 210 ℃ at the speed of 1K/min, and preserving the heat for 16h (in an extrusion-T5 state), thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy material.
(6) Impact resistance
The high-strength magnesium alloy obtained in the example has good performance of resisting dynamic high-speed impact load, and the alloy of the example is determined to have room temperature and strain rate of 2521s-1When the tensile strength is higher than the tensile strength, the compressive strength is 693MPa, the yield strength is 553MPa, and the elongation after fracture is 14.0 percent; 200 ℃ and a strain rate of 2645s-1When the tensile strength is 644MPa, the yield strength is 525MPa, and the elongation after fracture is 16.0 percent;
example 4
(1) Alloy composition
The alloy comprises the following components in percentage by mass: gd 4.6%, Y5%, Zr 0.95%; less than or equal to 0.02 percent of impurity element Al, less than or equal to 0.02 percent of Cu, less than or equal to 0.02 percent of Fe, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Si, and the balance of Mg.
(2) Alloy casting
After the ingredients are completely mixed, putting the weighed raw materials into a drying oven for drying for later use, wherein the temperature of the drying oven is 150 ℃; when the alloy is smelted, adding pure magnesium and intermediate alloys Mg-Gd and Mg-Y into a crucible to be heated and melted, heating to 780 ℃ after the pure magnesium and the intermediate alloys are completely melted, adding the Mg-Zr intermediate alloys, refining for 10 minutes after the Mg-Zr intermediate alloys are completely melted, slagging off, standing, cooling to 750 ℃, pouring the alloy liquid into a steel die preheated to 300 ℃, and protecting by adopting inert gas during casting to obtain the round bar cast ingot.
(3) Solution treatment
Placing the prepared cast ingot in a resistance heating furnace, heating to 425 ℃ and preserving heat for 10h, then heating to 510 ℃ at the speed of 5K/min and preserving heat for 16h, and then performing water quenching;
(4) hot extrusion molding
Processing the diameter of a round bar cast ingot to be 30mm, preserving the heat of the cast ingot in a heating furnace at 500 ℃ for 2h, preserving the heat of an extrusion base at 200 ℃ for 2h, and preserving the heat of an extrusion cylinder, an extrusion rod, an extrusion pad and an extrusion die for 2h at 400 ℃; setting the extrusion speed to be 4mm/s and the extrusion ratio to be 3.75, and preparing the extruded alloy material;
(5) aging treatment
And (3) placing the extruded alloy material in a resistance heating furnace, heating to 220 ℃ at the speed of 2K/min, and preserving the heat for 12h (in an extrusion-T5 state), thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy material.
(6) Impact resistance
The high-strength magnesium alloy obtained in the example has good performance of resisting dynamic high-speed impact load, and the alloy of the example is determined to have room temperature and strain rate of 2045s-1When the tensile strength is 667MPa, the yield strength is 524MPa, and the elongation after fracture is 14.0 percent; 200 ℃ and a strain rate of 2465s-1When the tensile strength is higher than the tensile strength, the compressive strength is 650MPa, the yield strength is 526MPa, and the elongation after fracture is 16.0 percent;
example 5
(1) Alloy composition
The alloy comprises the following components in percentage by mass: gd 4.9%, Y5.5%, Zr 1%; less than or equal to 0.02 percent of impurity element Al, less than or equal to 0.02 percent of Cu, less than or equal to 0.02 percent of Fe, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Si, and the balance of Mg.
(2) Alloy casting
After the ingredients are completely mixed, putting the weighed raw materials into a drying oven for drying for later use, wherein the temperature of the drying oven is 150 ℃; when the alloy is smelted, adding pure magnesium and intermediate alloys Mg-Gd and Mg-Y into a crucible to be heated and melted, heating to 780 ℃ after the pure magnesium and the intermediate alloys are completely melted, adding the Mg-Zr intermediate alloys, refining for 10 minutes after the Mg-Zr intermediate alloys are completely melted, slagging off, standing, cooling to 750 ℃, pouring the alloy liquid into a steel die preheated to 300 ℃, and protecting by adopting inert gas during casting to obtain the round bar cast ingot.
(3) Solution treatment
Putting the prepared cast ingot into a resistance heating furnace, heating to 450 ℃, preserving heat for 6h, heating to 530 ℃ at the speed of 5K/min, preserving heat for 8h, and then performing water quenching;
(4) hot extrusion molding
Processing the diameter of a round bar cast ingot to be 30mm, preserving the heat of the cast ingot in a heating furnace at 500 ℃ for 2h, preserving the heat of an extrusion base at 200 ℃ for 2h, and preserving the heat of an extrusion cylinder, an extrusion rod, an extrusion pad and an extrusion die for 2h at 400 ℃; setting the extrusion speed to be 2mm/s and the extrusion ratio to be 3.75, and preparing the extruded alloy material;
(5) aging treatment
And (3) placing the extruded alloy material in a resistance heating furnace, heating to 240 ℃ at the speed of 0.5K/min, and preserving the heat for 18h (in an extrusion-T5 state), thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy material.
(6) Impact resistance
The high-strength magnesium alloy obtained in the embodiment has good dynamic high-speed impact load resistance, and the alloy has the compression strength of 682MPa, the yield strength of 532MPa and the elongation after fracture of 13.5% when the room temperature and the strain rate are 1933s < -1 > through measurement; at 200 ℃ and a strain rate of 2141s < -1 >, the compressive strength is 635MPa, the yield strength is 547MPa, and the elongation after fracture is 15.0%.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material is characterized by comprising the following components in percentage by mass: 4-4.9% of Gd, 3.5-6.1% of Y and 0.81-1% of Zr, wherein the total content of Gd and Y rare earth elements is less than or equal to 11%, the total content of Al, Cu, Fe and Si impurity elements is not more than 0.1%, and the balance is pure Mg;
the preparation method comprises four parts of alloy casting, solution treatment, hot extrusion and aging treatment, and specifically comprises the following steps:
(1) casting of alloy: when the alloy is smelted, Mg element is added in the form of pure magnesium, Gd, Y and Zr elements are respectively added in the form of Mg-Gd, Mg-Y and Mg-Zr intermediate alloys, and the pure magnesium, the Mg-Gd, the Mg-Y and the Mg-Zr intermediate alloys are preheated and dried for later use at the temperature of 100-200 ℃ to ensure the safety of the experiment; putting the dried pure magnesium, Mg-Gd and Mg-Y into a crucible, and smelting in a smelting furnace at the temperature of 720-760 ℃; after the raw materials added into the crucible are completely melted, heating to 780-800 ℃, adding Mg-Zr intermediate alloy, adding a magnesium alloy refining agent for stirring and refining, and removing and cleaning impurities on the surface of the solution; standing the solution, adjusting the temperature to be at the temperature of 720-750 ℃, pouring the solution into a steel mold, wherein the alloy components meet the requirement of the mass percentage, and protecting gas is adopted for protection in the whole casting process to obtain a round bar ingot;
(2) solution treatment: placing the ingot obtained in the step (1) into a heating furnace, heating to 350-;
(3) hot extrusion deformation: carrying out solid solution homogenization treatment on the round bar ingot, and then carrying out hot extrusion forming on the round bar ingot on an extruder;
(4) aging treatment: the material formed by hot extrusion is slowly heated to 180-250 ℃ from room temperature, and is subjected to aging treatment by keeping the temperature for 0.5-120h, thus obtaining the impact-resistant high-strength heat-resistant magnesium rare earth alloy.
2. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material as claimed in claim 1, wherein in the step (1), the steel die is preheated to 150-300 ℃ before use.
3. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material according to claim 1, wherein in the step (1), after the casting is completed, the mold is cooled by using a water-cooled mold.
4. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material as claimed in claim 1, wherein in the step (2), the temperature rise rate of the solution treatment is 5-20K/min, and the temperature rise rate of the solution treatment is not less than 2K/min.
5. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material as claimed in claim 1, wherein in the step (3), the diameter of the round bar ingot is 2-4mm smaller than that of the extrusion cylinder, the length is 1.5-2.5 times of the diameter, the heating temperature of the ingot is 470-500 ℃, and the heating time is 0.5-2 h; in the step (3), the temperature of the extrusion base is 200-300 ℃, and the temperature of the extrusion cylinder, the extrusion rod and the extrusion die is 250-450 ℃; in the step (3), the extrusion rate of the extrusion molding is 2-5mm/s, and the extrusion ratio is 3.75.
6. The impact-resistant high-strength heat-resistant magnesium rare earth alloy material as claimed in claim 1, wherein in the step (4), the temperature of the extruded alloy is slowly raised from room temperature to 250 ℃ and is kept for 0.5-120h for aging treatment, and the temperature raising rate is 0.5-2K/min.
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| CN1804083A (en) * | 2006-01-23 | 2006-07-19 | 中南大学 | High-strength heat-resistant rare earth magnesium alloy |
| CN101078079A (en) * | 2007-06-22 | 2007-11-28 | 西安工业大学 | High-intensity thermal deformation resistant magnesium alloy |
| WO2011117628A1 (en) * | 2010-03-25 | 2011-09-29 | Magnesium Elektron Limited | Magnesium alloys containing heavy rare earths |
| CN106636825A (en) * | 2016-11-21 | 2017-05-10 | 孝义市东义镁业有限公司 | High-strength rare-earth magnesium alloy and preparation method thereof |
| CN106756370A (en) * | 2016-12-10 | 2017-05-31 | 哈尔滨工业大学 | A kind of anti-flaming Mg Gd Y Zn Zr alloys of high-strength anticorrosion and preparation method thereof |
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