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Method for improving plasticity of magnesium alloy sheets

A magnesium alloy and thin plate technology, which is applied in the field of improving the plasticity of magnesium alloy thin plates, can solve problems such as the lack of effective methods for plasticizing magnesium alloy thin plates, and achieve the effects of easy deformation in the thickness direction, improved plasticity, and reduced yield strength

Inactive Publication Date: 2014-07-09
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on improving the basal texture of magnesium alloy sheets is based on the theoretical stage, and there is still a lack of effective methods that can guide the industrial production of plastic magnesium alloy sheets.

Method used

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  • Method for improving plasticity of magnesium alloy sheets
  • Method for improving plasticity of magnesium alloy sheets
  • Method for improving plasticity of magnesium alloy sheets

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 A kind of method for improving the plasticity of magnesium alloy sheet

[0024] A method for improving the plasticity of a magnesium alloy sheet in this embodiment comprises the following steps:

[0025] S1) Take samples from the AZ31 magnesium alloy sheet products to be improved and stretch them at room temperature at 0° along the extrusion or rolling direction of the sheet. You can choose to stretch at room temperature on an electronic universal testing machine, and the stretching rate is 10 -3 -10 -1 the s -1 , make a true stress-strain curve, make a work hardening curve according to the true stress-strain curve, and determine the work hardening rate (θ) and strength (σ-σ 0.2 ) in relation to each other;

[0026] S2) Find the maximum inflection point of the curve from the work hardening curve obtained in step S1 and define it as the critical value a, such as figure 1 As shown in , values ​​A, B, and C represent different work hardening stages near th...

Embodiment 2

[0029] Embodiment 2 A kind of method for improving the plasticity of magnesium alloy sheet

[0030] A method for improving the plasticity of a magnesium alloy sheet in this embodiment comprises the following steps:

[0031] S1) Take samples from the AZ31 magnesium alloy sheet products to be improved and stretch them at room temperature at 45° along the extrusion or rolling direction of the sheet, and the stretching rate is 10 -3 -10 -1 the s -1 , make a true stress-strain curve, make a work hardening curve according to the true stress-strain curve, and determine the work hardening rate (θ) and strength (σ-σ 0.2 ) in relation to each other;

[0032] S2) Find the maximum inflection point of the curve from the work hardening curve obtained in step S1 and define it as the critical value b, such as figure 2 As shown in , values ​​A, B, and C represent different work hardening stages near the range of critical value b. In this embodiment, A, B, and C are respectively 2%, 4%, an...

Embodiment 3

[0035] Embodiment 3 A kind of method for improving the plasticity of magnesium alloy sheet

[0036] A method for improving the plasticity of a magnesium alloy sheet in this embodiment comprises the following steps:

[0037] S1) Take samples from the AZ31 magnesium alloy sheet products to be improved and stretch them at room temperature at 90° along the extrusion or rolling direction of the sheet, and the stretching rate is 10 -3 -10 -1 the s -1 , make a true stress-strain curve, make a work hardening curve according to the true stress-strain curve, and determine the work hardening rate (θ) and strength (σ-σ 0.2 ) in relation to each other;

[0038] S2) Find the maximum inflection point of the curve from the work hardening curve obtained in step S1 and define it as the critical value c, such as image 3 As shown in , values ​​A, B, and C represent different work hardening stages near the range of critical value c, and A, B, and C described in this embodiment are respectivel...

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Abstract

The invention discloses a method for improving plasticity of magnesium alloy sheets. The method comprises the following steps: (S1) sampling, respectively drawing a true stress-strain curve, and drawing a work hardening curve capable of determining the relationship between the work hardening rate and the strength according to the true stress-strain curve; (S2) finding the biggest inflection point, which is defined as a critical value, from the work hardening curve obtained in the step S1; (S3) referring to the critical value obtained in the step S2, firstly prestretching a magnesium alloy sheet material to the work hardening stage of the material; and (S4) annealing the material which is prestretched in the step S3 so as to remove stress concentration, thereby obtaining the magnesium alloy sheet product with improved plasticity. The method can be used for pointedly improving the plasticity of the magnesium alloy sheets with different components and basal textures, thereby obtaining the magnesium alloy sheets reaching the expected mechanical performance index and consequently providing a reliable guarantee for the follow-up industrial production of the magnesium alloy sheets.

Description

technical field [0001] The invention belongs to the field of plastic processing of nonferrous metals, in particular to a method for improving the plasticity of a magnesium alloy sheet. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good thermal and electrical conductivity, damping and shock absorption, electromagnetic shielding, easy processing and easy recycling, etc. It has extremely important application value in the fields of automobiles, electronic communications, aerospace and national defense and military and broad application prospects. Most magnesium alloys have a hexagonal close-packed crystal structure (HCP), and plastic deformation at room temperature is limited to basal {0001}<11-20> slip and conical {10-12}<1011> twinning, which is a difficult Working and forming metal materials. The results show that the critical shear stress (CRSS) of each deformation mode of magnesium alloys at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 杨青山蒋斌何俊杰蒋显全董含武罗素琴潘复生
Owner CHONGQING ACADEMY OF SCI & TECH
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