A kind of magnesium alloy and processing method for improving its tension-compression asymmetry

A technology of tension-compression asymmetry and processing methods, applied in the field of magnesium alloys, can solve problems such as unfavorable formability, achieve fine grain size, and expand the effect of industrial application fields

Active Publication Date: 2022-03-25
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is disadvantageous for parts that require good formability and are used in certain critical application areas

Method used

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  • A kind of magnesium alloy and processing method for improving its tension-compression asymmetry
  • A kind of magnesium alloy and processing method for improving its tension-compression asymmetry
  • A kind of magnesium alloy and processing method for improving its tension-compression asymmetry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A processing method for improving the tension-compression asymmetry of magnesium alloys, comprising the following steps:

[0040] Step 1: batching according to the mass ratio, and carrying out smelting; the ratio of each component in the magnesium alloy is 0.2wt% of tin, 1.7wt% of yttrium, and the balance is magnesium. The raw material is 99.9wt.% industrial pure magnesium, the tin is 99.9wt.% pure tin and Mg-Y gold alloy, and the mass fraction of Y in the Mg-Y gold alloy is 30wt.%. Due to the limitation of process conditions, some unavoidable impurities may still exist in the actual alloy.

[0041] The melting process is as follows:

[0042] Use a steel brush to polish and remove the scale on the surface of the raw materials, and dry the raw materials, crucibles, metal molds and other tools in a preheating furnace at 150-200 °C. Then the pure magnesium ingots were placed in the crucible in the well-type resistance furnace. And pass into CO 2 and SF 6 A mixed shiel...

Embodiment 2

[0048] A processing method for improving the tension-compression asymmetry of magnesium alloys, the steps are as follows:

[0049] Step 1: batching according to the mass ratio, and carrying out smelting; the ratio of each component in the magnesium alloy is 0.3wt% of tin, 1.8wt% of yttrium, and the balance is magnesium. The raw material is 99.9wt.% industrial pure magnesium, the tin is 99.9wt.% pure tin and Mg-Y gold alloy, and the mass fraction of Y in the Mg-Y gold alloy is 30wt.%. Due to the limitation of process conditions, some unavoidable impurities may still exist in the actual alloy.

[0050] Other steps are with embodiment 1.

Embodiment 3

[0052]A processing method for improving the tension-compression asymmetry of magnesium alloys, the steps are as follows:

[0053] Step 1: batching according to the mass ratio, and carrying out smelting; the ratio of each component in the magnesium alloy is 0.4wt% of tin, 1.9wt% of yttrium, and the balance is magnesium. The raw material is 99.9wt.% industrial pure magnesium, the tin is 99.9wt.% pure tin and Mg-Y gold alloy, and the mass fraction of Y in the Mg-Y gold alloy is 30wt.%. Due to the limitation of process conditions, some unavoidable impurities may still exist in the actual alloy.

[0054] Other steps are with embodiment 1.

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Abstract

The invention discloses a magnesium alloy and a processing method for improving its tension-compression asymmetry. The magnesium alloy comprises the following components by mass: 0.2wt.%-0.8wt.% of tin, 1.7wt.%-2.3wt.% of yttrium. %, the balance is magnesium; the processing method includes the following steps: step 1: batching according to the mass ratio, and smelting; step 2: pouring the molten slurry obtained in step 1 to obtain an ingot; step 3: casting the ingot obtained in step 2 Carry out heat treatment; Step 4: Carry out hot extrusion once to the cast ingot obtained in Step 3; Step 5: Carry out secondary hot extrusion to the product obtained in Step 4, can obtain desired magnesium alloy; Magnesium alloy among the present invention is passed Secondary extrusion, the obtained Mg‑Sn‑Y alloy has fine grains and precipitated phase Sn 3 Y 5 The content is large and the distribution is wide; the magnesium alloy in the invention effectively improves the asymmetry of tension and compression of the alloy through secondary extrusion molding, and expands the industrial application field of the deformed magnesium alloy on the basis of low cost.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a magnesium alloy and a processing method for improving its tension-compression asymmetry. Background technique [0002] Magnesium and magnesium alloys are known as "green engineering structural materials in the 21st century" due to their advantages such as low density, high specific stiffness and specific strength, excellent damping and shock absorption performance, environmental protection and energy saving. Although magnesium and its alloys have been successfully used in automation industry, aviation industry and electronic 3C and other fields. But because of its own special HCP structure, it has different mechanical properties. Generally, the mechanical properties of wrought magnesium alloys are significantly different in tension and compression at room temperature, such as the compression yield strength is usually lower than the tension yield strength, thus exhibit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06
Inventor 曾迎熊训飞钱晓英万杨杰孙可欣张英波蒋斌
Owner SOUTHWEST JIAOTONG UNIV
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