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Low-cost high-strength-toughness magnesium alloy aging strengthening and toughening method

A magnesium alloy and low-cost technology, which is applied in the field of aging-strengthening and toughening of low-cost, high-strength and tough magnesium alloys, can solve the problems of high cost of magnesium alloy raw materials and unfavorable production of magnesium alloy components, so as to solve the problem of greatly reduced toughness, easy to implement, and good quality. The effect of toughness

Active Publication Date: 2020-02-21
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, magnesium alloys contain a large amount of rare earth elements, which leads to high cost of magnesium alloy raw materials, which is not conducive to the production of a large number of magnesium alloy components.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A low-cost, high-strength and toughness magnesium alloy aging toughening method, the steps include: firstly placing the Mg-6.2%Zn-1.0Y-0.4Nd-0.2La-0.5Zr alloy component in an atmosphere of 110 ° C for primary aging treatment 6h, then place it in a mold at room temperature for molding, the total molding volume is controlled to 6%, and finally the molded component is placed in an atmosphere of 200°C for 12h for secondary aging treatment, and the secondary aging treatment is completed Then carry out strong wind cooling. After the completion, the mechanical performance test of the component was carried out. The tensile strength of the component was measured to be 450MPa, and the elongation after fracture was 14%.

Embodiment 2

[0015] A low-cost, high-strength and toughness magnesium alloy aging toughening method, the steps include: firstly placing the Mg-5.8%Zn-1.3Y-0.2-0.9Nd-0.3La-0.6Mn alloy component in an atmosphere of 80 ° C for a first-level Aging treatment for 8 hours, and then molded in a mold at room temperature, the total molding volume is controlled at 8%, and finally the molded component is placed in an atmosphere of 170°C for 20 hours for secondary aging treatment. Cool with strong wind after processing. After the completion, the mechanical properties of the component were tested. The tensile strength of the component was 448MPa, and the elongation after fracture was 15.1%.

Embodiment 3

[0017] A low-cost, high-strength and toughness magnesium alloy aging toughening method, the steps include: first placing the Mg-5.6Zn-0.7Y-1.0%Nd-0.6La-0.6Zr alloy component in an atmosphere of 120 ° C for primary aging treatment 4h, then place it in a mold at room temperature for molding, the total molding volume is controlled at 5%, and finally the molded component is placed in an atmosphere of 150°C for 30h for secondary aging treatment, and the secondary aging treatment is completed Then carry out strong wind cooling. After the completion, the mechanical properties of the component were tested, and the tensile strength of the component was 454MPa, and the elongation after fracture was 14.6%.

[0018] This method further improves the strength and elongation after fracture of magnesium alloys with low content of rare earth elements from the process route, which further expands the application range of this magnesium alloy; this method can promote the uniform nucleation of st...

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Abstract

The invention provides a low-cost high-strength-toughness magnesium alloy aging strengthening and toughening method. The low-cost high-strength-toughness magnesium alloy aging strengthening and toughening method comprises the steps of conducting primary aging treatment, die pressing treatment, secondary aging treatment and cooling treatment on a magnesium alloy component in sequence, wherein the magnesium alloy component comprises, by mass, 5.5-6.5% of Zn, 0.7-1.4% of Y, 0.2-1.0% of Nd, 0.2-1.0% of La, 0.5-0.8% of Zr or Mn, and the balance Mg and inevitable impurities, and the sum total of themass percentage of rare earth elements Y, Nd and La among components is not more than 2.5% of the total mass fraction; and controlling the mold temperature to be indoor temperature in the die pressing treatment process. Through the low-cost high-strength-toughness magnesium alloy aging strengthening and toughening method, while the high strength of the magnesium alloy component is ensured, the magnesium alloy component can have the enough toughness, and the problem that the strength is improved and the toughness is substantially reduced through the traditional heat treatment process is solved. The low-cost high-strength-toughness magnesium alloy aging strengthening and toughening method is simple in operation, easy to implement and suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to Mg-Zn series alloys, in particular to a method for aging strengthening and toughening magnesium alloys with low cost and high strength and toughness. Background technique [0002] The composition of the high-strength magnesium alloy in the document CN101463441A is: 3%≤Y≤16%, 0%≤GD≤10%, 0.3%≤CA≤5%, 0.1≤ZR≤1.5%, and the rest are MG and impurities; after heat treatment , and its instantaneous ultimate tensile strength at 300°C is 262MPa; the composition of the high-strength magnesium alloy in document CN102732763A is: 8.2≤Gd≤10.2, 5≤Y≤6, 0.5≤Zn≤4, 0.5≤Mn≤0.8, and The content is magnesium and unavoidable impurities; after deformation and heat treatment, the room temperature strength of the alloy reaches more than 496MPa; the composition of the high-strength magnesium alloy in the document CN105525179A is: 7.5≤Gd≤9.5, 3.5≤Y≤5.0, 1.0≤Zn≤1.5 , 0.3≤Mn≤0.6, impurity≤0.13% and the balance is magnesium; after deformation and heat treatme...

Claims

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Application Information

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IPC IPC(8): C22F1/047C22C23/04
CPCC22C23/04C22F1/047
Inventor 夏祥生陈强舒大禹黄树海林军康凤柴舒心
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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