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A two-stage continuous extrusion preparation method for increasing the yield strength of mg-zn-er alloy

A mg-zn-er, yield strength technology, applied in the field of two-stage continuous extrusion preparation for improving the yield strength of Mg-Zn-Er alloys, can solve the problem of poor plastic deformation ability of magnesium alloys, complex mechanical properties of magnesium alloys, and influences Industrial application and other problems, to achieve the effect of improving yield strength, solving poor mechanical properties and short process

Active Publication Date: 2021-12-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical purpose of the present invention is mainly to solve the problem that the current magnesium alloy has poor plastic deformation ability and affects the industrial application. Through the continuous extrusion deformation device, the yield strength of the magnesium alloy can be effectively improved. The method is simple in equipment and simple in operation, and is expected to be applied in industrial production
[0006] The present invention aims at the disadvantages of the current complex process for improving the mechanical properties of magnesium alloys, and proposes a two-stage extrusion device and its extrusion method, especially suitable for Mg-Zn-Er alloys

Method used

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  • A two-stage continuous extrusion preparation method for increasing the yield strength of mg-zn-er alloy
  • A two-stage continuous extrusion preparation method for increasing the yield strength of mg-zn-er alloy
  • A two-stage continuous extrusion preparation method for increasing the yield strength of mg-zn-er alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Weigh 435.2g magnesium ingot, 27.7g zinc ingot and 35.1gMg-Er intermediate alloy ingot according to the composition of magnesium alloy as Mg-6Zn-1Er, put them into a muffle furnace and heat them to 200°C for drying and preheating, and pass into the shielding gas (SF 2 +N 2 ). Heat the graphite crucible in an induction furnace to 200°C for 2 minutes and pour off the ash. Put the preheated magnesium ingot into the graphite crucible and heat it to 720°C, and pass protective gas (SF 2 +N 2). After the magnesium ingot in the graphite crucible is completely melted, add the preheated Mg-Er intermediate alloy and zinc ingot respectively. After the newly added metal ingot is completely melted, keep it warm for 5 minutes to obtain the Mg-Zn-Er alloy solution, stir for 3 minutes and then let it stand 5min. The surface scum and scale are removed, and the Mg-Zn-Er alloy solution is poured into a metal mold to obtain the Mg-6Zn-1Er cast alloy.

[0040] 2. Under protective g...

Embodiment 2

[0043] 1. Weigh 864.2g magnesium ingot, 55.6g zinc ingot, 100.2g Mg-Er intermediate alloy ingot according to the composition of magnesium alloy as Mg-6Zn-3Er and put them into a muffle furnace and heat to 200°C for drying and preheating, and Into the shielding gas (SF 2 +N 2 ). Heat the graphite crucible in an induction furnace to 200°C for 2 minutes and pour off the ash. Put the preheated magnesium ingot into the graphite crucible and heat it to 720°C, and pass protective gas (SF 2 +N 2 ). After the magnesium ingot in the graphite crucible is completely melted, add the preheated Mg-Er intermediate alloy and zinc ingot respectively. After the newly added metal ingot is completely melted, keep it warm for 5 minutes to obtain the Mg-Zn-Er alloy solution, stir for 3 minutes and then let it stand 5min. The surface scum and scale are removed, and the Mg-Zn-Er alloy solution is poured into a metal mold to obtain the Mg-6Zn-3Er cast alloy.

[0044] 2. Under protective gas cond...

Embodiment 3

[0047] 1. Weigh 254.5g magnesium ingot, 33.3g zinc ingot and 187.5g Mg-Er intermediate alloy ingot according to the composition of magnesium alloy as Mg-6Zn-6Er and put them into a muffle furnace and heat to 200°C for drying and preheating, and Into the shielding gas (SF 2 +N 2 ). Heat the graphite crucible to 200°C for 3 minutes in an induction furnace and pour off the ash. Put the preheated magnesium ingot into the graphite crucible and heat it to 720°C, and pass protective gas (SF 2 +N 2 ). After the magnesium ingot in the graphite crucible is completely melted, add the preheated Mg-Er intermediate alloy and zinc ingot respectively. After the newly added metal ingot is completely melted, keep it warm for 5 minutes to obtain the Mg-Zn-Er alloy solution, stir for 3 minutes and then let it stand 5min. The surface scum and scale are removed, and the Mg-Zn-Er alloy solution is poured into a metal mold to obtain the Mg-6Zn-6Er cast alloy.

[0048] 2. Under protective gas c...

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Abstract

A two-stage continuous extrusion preparation method for improving the yield strength of Mg-Zn-Er alloys belongs to the field of magnesium alloy preparation. In the two-stage extrusion preparation method provided by the present invention, two continuously placed extrusion gaskets are used to achieve The effect of two-stage continuous extrusion. Wherein the inner diameter of the first-stage extruded gasket is larger than the inner diameter of the second-stage extruded gasket. After two consecutive extrusion deformations, the yield strength of the magnesium alloy can be increased by more than 12%. This method is simple and easy to operate, can further improve the mechanical properties of existing magnesium alloy rods, and expand the application of magnesium alloys in aerospace, automotive engines and other fields.

Description

technical field [0001] The invention belongs to the field of magnesium alloy preparation, and in particular relates to the development of a two-stage continuous extrusion preparation method for improving the yield strength of Mg-Zn-Er alloy. Background technique [0002] As the lightest engineering structural material at present, magnesium metal has a density of only 1 / 4 of steel and 2 / 3 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, etc., and has been widely used in the automotive industry, textile and printing industries, aerospace and 3C products and other industries that require lightweight and high-efficiency materials. The resource reserves of magnesium on the earth are quite abundant, and its content in the earth's crust ranks eighth, accounting for about 2.35% of the total amount of the earth's crust, accounting for 0.14% of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C1/03
CPCC22F1/06C22C1/03
Inventor 杜文博李硕王朝辉于子健刘轲李淑波杜宪赵晨辰
Owner BEIJING UNIV OF TECH