CN111172481A - Two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy - Google Patents
Two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy Download PDFInfo
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- CN111172481A CN111172481A CN202010024308.5A CN202010024308A CN111172481A CN 111172481 A CN111172481 A CN 111172481A CN 202010024308 A CN202010024308 A CN 202010024308A CN 111172481 A CN111172481 A CN 111172481A
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Abstract
The invention discloses a two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy, belongs to the field of magnesium alloy preparation, and achieves the effect of two-stage continuous extrusion by utilizing two continuously placed extrusion gaskets. Wherein the inner diameter of the first stage of the extrusion gasket is larger than the inner diameter of the second stage of the extrusion gasket. After two times of continuous extrusion deformation, the yield strength of the magnesium alloy can be improved by more than 12%. The method has simple process and easy operation, can further improve the mechanical property of the existing magnesium alloy bar, and expands the application of the magnesium alloy in the fields of aerospace, automobile engines and the like.
Description
Technical Field
The invention belongs to the field of magnesium alloy preparation, and particularly relates to a two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy.
Background
Magnesium metal, the lightest engineering structure material at present, has the density of only 1/4 of that of steel and 2/3 of that of aluminum. In addition, magnesium has the advantages of low density, high specific strength and specific stiffness, high elastic modulus and electronegativity, good thermal conductivity and the like, and is widely applied to industries requiring light weight and high efficiency on materials, such as the automobile industry, the textile and printing industry, aerospace, 3C products and the like. The resource reserves of magnesium on the earth are quite abundant, the content of magnesium in the earth crust is 8 th, which accounts for about 2.35 percent of the total amount of the earth crust and 0.14 percent of the mass of seawater, and is second only to iron and aluminum, which are 3 rd of common metals. The content of magnesium element in ocean and salt lake is also considerable, and the content of magnesium in ocean is up to 6 x 1016t, i.e. in every cubic sea water, about 1.3kg of magnesium is present. And magnesium and its alloy are easy to recycle.
However, the application of magnesium alloy is greatly limited by the problems of insufficient mechanical properties, poor deformability and the like of the existing magnesium alloy. The mechanical property of the Mg-Zn-Er alloy is effectively improved after multi-pass rolling, but the process is complex, and the problem that how to effectively improve the mechanical property of the magnesium alloy by using a simple process is to be solved urgently is solved.
The scheme provided by the invention aiming at the defects of the magnesium alloy has the following positive significance: firstly, the yield strength of the material is effectively improved by utilizing continuous extrusion deformation, and the plastic deformation capacity of the material is increased; and secondly, the method is simple in equipment and simple in operation, and is hopeful to be applied to industrial production.
Disclosure of Invention
The technical purpose of the invention is mainly to solve the problems that the prior magnesium alloy has poor plastic deformation capability and affects the industrial application, the yield strength of the magnesium alloy is effectively improved by a continuous extrusion deformation device, and the method has simple equipment and simple operation and is expected to be applied to the industrial production.
The invention provides a two-stage extrusion device and an extrusion method thereof, which are used for overcoming the defect of complex process for improving the mechanical property of the magnesium alloy at present, and are particularly suitable for Mg-Zn-Er alloy. The method effectively improves the grain size and the second phase distribution aiming at the deformation characteristic of the magnesium alloy, thereby effectively improving the yield strength of the material.
A two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy is characterized in that magnesium alloy is continuously extruded twice, wherein the inner diameter of a circular ring of an extrusion gasket used for first-stage extrusion is larger than that of a circular ring of an extrusion gasket used for second-stage extrusion, namely the first-stage extrusion ratio is smaller than that of the second-stage extrusion ratio.
The two-time extrusion is continuous extrusion, the extrusion ingot is extruded and molded by the secondary extrusion gasket immediately after being deformed in the primary extrusion gasket, and other deformation processes are not arranged in the middle.
The extrusion ratio of the first stage extrusion can be any extrusion ratio of 1-20, and the extrusion ratio of the second stage extrusion is any extrusion ratio greater than the first stage extrusion ratio.
The extrusion ratio is the ratio of the area formed by the outer diameter of the annular extrusion gasket to the area formed by the inner diameter.
The two-stage continuous extrusion method is to heat the die and the extrusion ingot to more than 250 ℃ together for extrusion, and finally obtain the Mg-Zn-Er bar through two times of continuous extrusion deformation.
A two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy specifically comprises the following steps:
1) preparing an as-cast alloy material; 2) two-stage continuous extrusion process
The method comprises the following specific steps:
1) preparation of as-cast alloy material
(1) Preparing magnesium ingots, zinc ingots and Mg-Er intermediate alloy according to the weight percentage of the components in the target alloy, and drying in a muffle furnace;
(2) heating the graphite crucible in an induction furnace to 200-250 ℃, preserving the temperature for 2min, and pouring off ash;
(3) putting the preheated magnesium ingot in the step (1) into the graphite crucible in the step (2), heating to 700-750 ℃, and introducing protective gas (SF) into the graphite crucible2+N2)；
(4) Adding the Mg-Er intermediate alloy and the zinc ingot in the step (1) after the magnesium ingot in the graphite crucible is completely melted, preserving heat for 5min after the magnesium ingot is completely melted to obtain a Mg-Zn-Er alloy solution, stirring for 3min, standing for 5min, removing floating slag and oxide skin on the surface, and pouring the Mg-Zn-Er alloy solution into a metal mold to obtain a Mg-Zn-Er as-cast alloy;
2) thermomechanical treatment process
(1) Under protective gas conditions (SF)2+N2) Processing the as-cast Mg-Zn-Er alloy into an extrusion ingot, putting the extrusion ingot into an extrusion die, and heating the extrusion ingot to 250-400 ℃ in a muffle furnace;
(2) under protective gas conditions (SF)2+N2) Placing two extrusion gaskets with different extrusion ratios on the extrusion ingot heated in the step (1), wherein the extrusion ratio of the primary extrusion gasket is smaller than that of the secondary extrusion gasket, namely the inner diameter of the primary extrusion gasket is larger than that of the secondary extrusion gasket.
(3) And (3) placing the assembled extrusion die on an extruder, and extruding to obtain the magnesium alloy bar through secondary continuous deformation.
The invention relates to a double-stage extrusion device, which comprises: the extrusion die comprises a base (1), an extrusion deformation cavity gasket (2), an extrusion deformation cavity (3), a two-stage continuous extrusion device (4) and an extrusion top barrel (5), wherein the two-stage extrusion deformation mechanism is a core component of the die and comprises 2 parts of devices, the first part is a first-stage deformation device (4-1) with an extrusion ratio of 1: n, and the second part is a second-stage deformation device (4-2) with an extrusion ratio of 1: m; the center of the base is a circular groove, the extrusion deformation cavity is a barrel, and the extrusion deformation cavity is placed in the groove; the gasket (2) is a round extrusion gasket and is placed on the base (3) in the extrusion deformation cavity; the primary deformation device (4-1) is a circular gasket, the ratio of the area of an outer diameter circle to the area of an inner hole circle is n: 1, the primary deformation device is placed on a deformation material in the extrusion deformation cavity (3), the secondary deformation device (4-2) is closely attached to the primary deformation device, the secondary deformation device is a circular gasket, the ratio of the area of the outer diameter circle to the area of the inner hole circle is m: 1, and m is more than n; an extrusion top barrel (5) is arranged on the circular ring surface of the secondary deformation device, and the extrusion top barrel is a round barrel and is not matched with the extrusion deformation cavity. In the backward extrusion processing process, the assembled two-stage continuous extrusion device is placed into a groove corresponding to a base of a vertical extruder, then an ejection device of the extruder acts on the top of a cylindrical extrusion top cylinder (5), the extrusion top cylinder (5), a secondary deformation device (4-2) and a primary deformation device (4-1) are driven to move downwards in the downward movement process of the ejection device of the extruder, and meanwhile, deformation materials in an extrusion cavity sequentially move upwards through the primary deformation device (4-1) and the secondary deformation device (4-2), and finally the magnesium alloy rod is obtained.
The extrusion deformation cavity is placed in the groove of the base, and the fit clearance of the extrusion deformation cavity is 1 mm; the fit clearance between the gasket and the extrusion deformation cavity is less than 1 mm; the fit clearance between the device of the double-stage extrusion deformation mechanism and the extrusion deformation cavity is smaller than 1 mm.
The values of n and m are not limited, for example, n is 1-20, and m is 16-50.
The composition of the Mg-Zn-Er alloy is not limited, and the content of Zn in the Mg-Zn-Er alloy is 6%, and the content of Er is 1-6%.
The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy has the following advantages: the whole preparation process is simple, the flow is short, the problems of poor mechanical property, complex preparation process and the like of the conventional magnesium alloy can be solved, the yield strength of the material can be simply and effectively improved, and the application of the magnesium alloy in the fields of aerospace and 3C electronics is hopefully expanded. After two-stage continuous extrusion, the yield strength of the obtained alloy is improved by at least more than 12%.
The invention relates to a two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy, which is characterized by comprising the following steps of: the extrusion deformation cavity is arranged in the base, and after a magnesium alloy extrusion ingot is placed, the extrusion ratio is smaller than n: 1, putting a first-order deformation ring, and then, setting the extrusion ratio as m: 1, placing the secondary deformation ring on the primary ring, heating the assembled extrusion device to a certain temperature such as 250-400 ℃, and then extruding to obtain a continuous deformation extrusion ratio m: 1A magnesium alloy rod.
In the invention, two extrusion gaskets with different small and large extrusion ratios are used to realize secondary continuous extrusion deformation. The compression ratio of two of the shims is not limited to 10: 1 and 25: 1, the effect that the yield strength is obviously higher than that of the high extrusion ratio only extruded once can be achieved by the extrusion ratio of the secondary extrusion gasket being larger than that of the primary extrusion gasket.
Drawings
FIG. 1 is a schematic view of a two-stage counter-extrusion die involved in the present invention;
wherein 1 is a base, 2 is a cylindrical extrusion deformation cavity gasket, 3 is a cylindrical extrusion deformation cavity, 4-1 is a primary deformation device, 4-2 is a secondary deformation device, and 5 is an extrusion top barrel;
FIG. 2 is an OM diagram of a bar made of the Mg-6Zn-1Er alloy of example 1 by the present invention, wherein (a), (b) and (c) are metallographic phases after only one extrusion and (d), (e) and (f) are metallographic phases after two successive extrusions;
FIG. 3 is a comparison of the mechanical properties of the Mg-6Zn-1Er alloy of example 1 after single extrusion and double extrusion of the bar material obtained by the present invention;
FIG. 4 is a comparison of the mechanical properties of the Mg-6Zn-3Er alloy of example 2 after single extrusion and double extrusion of the bar material obtained by the present invention;
FIG. 5 is a comparison of the mechanical properties of the Mg-6Zn-6Er alloy of example 3 after single extrusion and double extrusion of the bar material obtained by the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be merely illustrative of specific embodiments of the present invention and not to limit the scope of the claims.
Example 1
1. 435.2g of magnesium ingot, 27.7g of zinc ingot and 35.1g of Mg-Er intermediate alloy ingot are weighed according to the components of the magnesium alloy, are put into a muffle furnace to be heated to 200 ℃ for drying and preheating, and protective gas (SF) is introduced2+N2). Heating the graphite crucible in an induction furnace to 200 ℃, preserving the temperature for 2min and pouring off ash. Putting the preheated magnesium ingot into a graphite crucible, heating to 720 ℃, and introducing protective gas (SF) into the graphite crucible2+N2). Respectively adding preheated Mg-Er intermediate alloy and zinc ingots after magnesium ingots in the graphite crucible are completely melted, preserving heat for 5min after a newly added metal ingot is completely melted to obtain Mg-Zn-Er alloy solution, stirring for 3min, and standing for 5 min. Removing surface floatingAnd (3) slag and oxide skin, and pouring the Mg-Zn-Er alloy solution into a metal mold to obtain the Mg-6Zn-1Er as-cast alloy.
2. Under protective gas conditions (SF)2+N2) Processing the as-cast Mg-Zn-Er alloy into an extrusion ingot, putting the extrusion ingot into an extrusion die, and heating the extrusion ingot to 250 ℃ in a muffle furnace; placing two extrusion gaskets with different extrusion proportions on the extrusion ingot heated in the step (1), wherein the extrusion ratio of the first-level extrusion gasket is 5: 1; the extrusion ratio of the secondary extrusion gasket is 16: 1. and then placing the assembled extrusion die on an extruder, and extruding to obtain the Mg-6Zn-1Er alloy bar through secondary continuous deformation. And only a single pass 16: the yield strength after 1 extrusion is changed from 163MPa to 186MPa, which is improved by 14.1%. The specific properties are as follows:
example 2
1. 864.2g of magnesium ingot, 55.6g of zinc ingot and 100.2g of Mg-Er intermediate alloy ingot are weighed according to the components of the magnesium alloy, the magnesium alloy is put into a muffle furnace to be heated to 200 ℃, dried and preheated, and protective gas (SF) is introduced2+N2). Heating the graphite crucible in an induction furnace to 200 ℃, preserving the temperature for 2min and pouring off ash. Putting the preheated magnesium ingot into a graphite crucible, heating to 720 ℃, and introducing protective gas (SF) into the graphite crucible2+N2). Respectively adding preheated Mg-Er intermediate alloy and zinc ingots after magnesium ingots in the graphite crucible are completely melted, preserving heat for 5min after a newly added metal ingot is completely melted to obtain Mg-Zn-Er alloy solution, stirring for 3min, and standing for 5 min. Removing dross and oxide skin on the surface, and pouring the Mg-Zn-Er alloy solution into a metal mold to obtain the Mg-6Zn-3Er as-cast alloy.
2. Under protective gas conditions (SF)2+N2) Processing the as-cast Mg-Zn-Er alloy into an extrusion ingot, putting the extrusion ingot into an extrusion die, and heating the extrusion ingot to 300 ℃ in a muffle furnace; placing two extrusion gaskets with different extrusion proportions on the extrusion ingot heated in the step (1), wherein the extrusion ratio of the first-level extrusion gasket is 10: 1; the extrusion ratio of the secondary extrusion gasket is 25: 1. then the assembled extrusion die is placed onAnd extruding on an extruder to obtain the Mg-6Zn-3Er alloy bar through secondary continuous deformation. And only a single pass 25: the yield strength of the extruded product is changed from 172MPa to 191MPa, which is improved by 12.8 percent. The specific properties are as follows:
example 3
1. 254.5g of magnesium ingot, 33.3g of zinc ingot and 187.5g of Mg-Er intermediate alloy ingot are weighed according to the components of the magnesium alloy, the magnesium alloy is put into a muffle furnace to be heated to 200 ℃, dried and preheated, and protective gas (SF) is introduced2+N2). Heating the graphite crucible in an induction furnace to 200 ℃, preserving the temperature for 3min, and pouring off ash. Putting the preheated magnesium ingot into a graphite crucible, heating to 720 ℃, and introducing protective gas (SF) into the graphite crucible2+N2). Respectively adding preheated Mg-Er intermediate alloy and zinc ingots after magnesium ingots in the graphite crucible are completely melted, preserving heat for 5min after a newly added metal ingot is completely melted to obtain Mg-Zn-Er alloy solution, stirring for 3min, and standing for 5 min. Removing dross and oxide skin on the surface, and pouring the Mg-Zn-Er alloy solution into a metal mold to obtain the Mg-6Zn-6Er as-cast alloy.
2. Under protective gas conditions (SF)2+N2) Processing the as-cast Mg-Zn-Er alloy into an extrusion ingot, putting the extrusion ingot into an extrusion die, and heating the extrusion ingot to 350 ℃ in a muffle furnace; placing two extrusion gaskets with different extrusion proportions on the extrusion ingot heated in the step (1), wherein the extrusion ratio of the first-level extrusion gasket is 10: 1; the extrusion ratio of the secondary extrusion gasket is 30: 1. and then placing the assembled extrusion die on an extruder, and extruding to obtain the Mg-6Zn-6Er alloy bar through secondary continuous deformation. And only a single pass of 30: the yield strength after 1 extrusion is improved by 17.1% from 145MPa to 171 MPa. The specific properties are as follows:
although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the following claims.
Claims (9)
1. A two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy is characterized in that magnesium alloy is continuously extruded twice, wherein the inner diameter of a circular ring of an extrusion gasket used for first-stage extrusion is larger than that of a circular ring of an extrusion gasket used for second-stage extrusion, namely the first-stage extrusion ratio is smaller than that of the second-stage extrusion ratio.
2. The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy according to claim 1, wherein the two-stage extrusion is continuous extrusion, the extrusion ingot is extruded by the two-stage extrusion gasket immediately after being deformed in the first-stage extrusion gasket, and no other deformation process is arranged in the middle.
3. The method for preparing Mg-Zn-Er alloy with two-stage continuous extrusion for improving yield strength according to claim 1, wherein the extrusion ratio of the first stage extrusion can be any extrusion ratio of 1 to 20, and the extrusion ratio of the second stage extrusion is any extrusion ratio larger than the first stage extrusion ratio.
4. The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy according to claim 1, wherein the extrusion ratio is the ratio of the area formed by the outer diameter of the annular extrusion gasket to the area formed by the inner diameter.
5. The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy according to claim 1, wherein the die and the extrusion ingot are heated to more than 250 ℃ together for extrusion, and the Mg-Zn-Er bar is obtained through two times of continuous extrusion deformation.
6. The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy according to claim 1, is characterized by comprising the following steps:
1) preparing an as-cast alloy material; 2) two-stage continuous extrusion process
The method comprises the following specific steps:
1) preparation of as-cast alloy material
(1) Preparing magnesium ingots, zinc ingots and Mg-Er intermediate alloy according to the weight percentage of the components in the target alloy, and drying in a muffle furnace;
(2) heating the graphite crucible in an induction furnace to 200-250 ℃, preserving the temperature for 2min, and pouring off ash;
(3) putting the preheated magnesium ingot in the step (1) into the graphite crucible in the step (2), heating to 700-750 ℃, and introducing protective gas (SF) into the graphite crucible2+N2)；
(4) Adding the Mg-Er intermediate alloy and the zinc ingot in the step (1) after the magnesium ingot in the graphite crucible is completely melted, preserving heat for 5min after the magnesium ingot is completely melted to obtain a Mg-Zn-Er alloy solution, stirring for 3min, standing for 5min, removing floating slag and oxide skin on the surface, and pouring the Mg-Zn-Er alloy solution into a metal mold to obtain a Mg-Zn-Er as-cast alloy;
2) thermomechanical treatment process
(1) Under protective gas conditions (SF)2+N2) Processing the as-cast Mg-Zn-Er alloy into an extrusion ingot, putting the extrusion ingot into an extrusion die, and heating the extrusion ingot to 250-400 ℃ in a muffle furnace;
(2) under protective gas conditions (SF)2+N2) Placing two extrusion gaskets with different extrusion ratios on the extrusion ingot heated in the step (1), wherein the extrusion ratio of the primary extrusion gasket is smaller than that of the secondary extrusion gasket, namely the inner diameter of the primary extrusion gasket is larger than that of the secondary extrusion gasket;
(3) and (3) placing the assembled extrusion die on an extruder, and extruding to obtain the magnesium alloy bar through secondary continuous deformation.
7. The two-stage continuous extrusion preparation method for improving the yield strength of the Mg-Zn-Er alloy according to claim 1, which is characterized in that a two-stage extrusion device is adopted, and comprises the following steps: the extrusion die comprises a base (1), an extrusion deformation cavity gasket (2), an extrusion deformation cavity (3), a two-stage continuous extrusion device (4) and an extrusion top barrel (5), wherein the two-stage extrusion deformation mechanism is a core component of the die and comprises 2 parts of devices, the first part is a first-stage deformation device (4-1) with an extrusion ratio of 1: n, and the second part is a second-stage deformation device (4-2) with an extrusion ratio of 1: m; the center of the base is a circular groove, the extrusion deformation cavity is a barrel, and the extrusion deformation cavity is placed in the groove; the gasket (2) is a round extrusion gasket and is placed on the base (3) in the extrusion deformation cavity; the primary deformation device (4-1) is a circular gasket, the ratio of the area of an outer diameter circle to the area of an inner hole circle is n: 1, the primary deformation device is placed on a deformation material in the extrusion deformation cavity (3), the secondary deformation device (4-2) is closely attached to the primary deformation device, the secondary deformation device is a circular gasket, the ratio of the area of the outer diameter circle to the area of the inner hole circle is m: 1, and m is more than n; an extrusion top barrel (5) is arranged on the circular ring surface of the secondary deformation device, and the extrusion top barrel is a round barrel and is not matched with the extrusion deformation cavity. In the backward extrusion processing process, the assembled two-stage continuous extrusion device is placed into a groove corresponding to a base of a vertical extruder, then an ejection device of the extruder acts on the top of a cylindrical extrusion top cylinder (5), the extrusion top cylinder (5), a secondary deformation device (4-2) and a primary deformation device (4-1) are driven to move downwards in the downward movement process of the ejection device of the extruder, and meanwhile, deformation materials in an extrusion cavity sequentially move upwards through the primary deformation device (4-1) and the secondary deformation device (4-2), and finally magnesium alloy bars are obtained;
the extrusion deformation cavity is placed in the groove of the base, and the fit clearance of the extrusion deformation cavity is 1 mm; the fit clearance between the gasket and the extrusion deformation cavity is less than 1 mm; the fit clearance between the device of the double-stage extrusion deformation mechanism and the extrusion deformation cavity is smaller than 1 mm.
8. The method for preparing Mg-Zn-Er alloy with improved yield strength by two-stage continuous extrusion according to claim 7, wherein the values of n and m are not limited, such as n is 1-20 and m is 16-50.
9. The two-stage continuous extrusion process for producing an Mg-Zn-Er alloy with improved yield strength according to claim 1, wherein the Mg-Zn-Er alloy is not limited to the above-mentioned composition, such as the Mg-Zn-Er alloy with a Zn content of 6% and an Er content of 1-6%.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266873A (en) * | 2011-07-12 | 2011-12-07 | 北京工业大学 | Two-stage backward extrusion device and extrusion method for Mg-Gd-Er-Zr alloy |
| CN102632095A (en) * | 2012-04-25 | 2012-08-15 | 上海交通大学 | Secondary continuous extrusion processing method of magnesium alloy and die plate insert for secondary continuous extrusion processing method |
| CN109825751A (en) * | 2019-04-02 | 2019-05-31 | 北京工业大学 | A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266873A (en) * | 2011-07-12 | 2011-12-07 | 北京工业大学 | Two-stage backward extrusion device and extrusion method for Mg-Gd-Er-Zr alloy |
| CN102632095A (en) * | 2012-04-25 | 2012-08-15 | 上海交通大学 | Secondary continuous extrusion processing method of magnesium alloy and die plate insert for secondary continuous extrusion processing method |
| CN109825751A (en) * | 2019-04-02 | 2019-05-31 | 北京工业大学 | A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof |
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