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A Method for Observing Internal Shear Bands of az31 Magnesium Alloy

A magnesium alloy and shear band technology, which is applied in the field of microstructure observation of metal materials, can solve the problems of small contrast difference, difficult to distinguish, small observation range of shear band, etc., achieves low equipment requirements, improves contrast difference, and is easy to The effect of promotion

Active Publication Date: 2020-02-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on shear bands is mainly directly observed through the contrast difference between the shear band area and the non-shear band area after corrosion of the plastically deformed AZ31 magnesium alloy. The contrast of the band area is relatively similar and difficult to distinguish, which makes it difficult to accurately reflect the spatial distribution of the shear band
Observation of shear bands in AZ31 magnesium alloy by scanning electron microscope also has the problem of small contrast difference and difficult determination of shear bands, while the scope of observation of shear bands by transmission electron microscope is small, and it is difficult to achieve accurate detection in a large range. Determining the morphology and distribution of shear bands

Method used

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  • A Method for Observing Internal Shear Bands of az31 Magnesium Alloy
  • A Method for Observing Internal Shear Bands of az31 Magnesium Alloy
  • A Method for Observing Internal Shear Bands of az31 Magnesium Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, use sliding friction to make the surface of AZ31 magnesium alloy plastically deform, and control the strain rate of sliding friction on the surface of AZ31 magnesium alloy to be 10 2 the s -1 ;

[0029] Step 2: Sampling the plastically deformed AZ31 magnesium alloy in step 1 to obtain an AZ31 magnesium alloy sample, and then annealing the AZ31 magnesium alloy sample; the temperature of the annealing treatment is 180° C., and the holding time is 20 minutes;

[0030] Step 3, use 600 sequentially # 、1000 # , 2000 # 、5000 # Grind the surface of the AZ31 magnesium alloy sample after the annealing treatment in step 2 step by step with silicon carbide sandpaper to obtain a flat, finely scratched AZ31 magnesium alloy sample observation plane; Observe that the plane is rotated 90° horizontally and then grind until the scratches from the last grinding are worn off;

[0031] Step 4, using a corrosive agent to corrode the observation plane of the AZ31 magnesium alloy ...

Embodiment 2

[0042] Step 1. Use sliding friction to make the surface of AZ31 magnesium alloy plastically deform, and control the strain rate of sliding friction on the surface of AZ31 magnesium alloy to be 5.5×10 2 the s -1 ;

[0043] Step 2. Sampling the plastically deformed AZ31 magnesium alloy in step 1 to obtain an AZ31 magnesium alloy sample, and then annealing the AZ31 magnesium alloy sample; the temperature of the annealing treatment is 160° C., and the holding time is 20 minutes;

[0044] Step 3, use 600 sequentially # 、1000 # , 2000 # 、5000 # Grind the surface of the AZ31 magnesium alloy sample after the annealing treatment in step 2 step by step with silicon carbide sandpaper to obtain a flat, finely scratched AZ31 magnesium alloy sample observation plane; Observe that the plane is rotated 90° horizontally and then grind until the scratches from the last grinding are worn off;

[0045] Step 4, using a corrosive agent to corrode the observation plane of the AZ31 magnesium al...

Embodiment 3

[0049] Step 1, use sliding friction to make the surface of AZ31 magnesium alloy plastically deform, and control the strain rate of sliding friction on the surface of AZ31 magnesium alloy to be 10 3 the s -1 ;

[0050] Step 2. Sampling the plastically deformed AZ31 magnesium alloy in step 1 to obtain an AZ31 magnesium alloy sample, and then annealing the AZ31 magnesium alloy sample; the temperature of the annealing treatment is 200° C., and the holding time is 20 minutes;

[0051] Step 3, use 600 sequentially # 、1000 # , 2000 # 、5000 # Grind the surface of the AZ31 magnesium alloy sample after the annealing treatment in step 2 step by step with silicon carbide sandpaper to obtain a flat, finely scratched AZ31 magnesium alloy sample observation plane; Observe that the plane is rotated 90° horizontally and then grind until the scratches from the last grinding are worn off;

[0052] Step 4, using a corrosive agent to corrode the observation plane of the AZ31 magnesium alloy ...

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Abstract

The invention discloses an observation method for an internal shear band of AZ31 magnesium alloy. The method comprises the following steps: firstly, adopting sliding friction to make the AZ31 magnesium alloy get plastic deformation; secondly, sampling the AZ31 magnesium alloy after plastic deformation and conducting annealing treatment; thirdly, subjecting the annealed AZ31 magnesium alloy sample to stepwise grinding to obtain AZ31 magnesium alloy sample observation plane; fourthly, corroding the AZ31 magnesium alloy sample observation plane; fifthly, observing the morphology of the internal shear band of the AZ31 magnesium alloy sample through an optical microscope. The observation method for the internal shear band of the AZ31 magnesium alloy improves the contrast difference between the an internal shear band area and a non-shear band area in the AZ31 magnesium alloy sample by annealing, and can clearly observe the morphology and distribution of the internal shear band of the deformed AZ31 magnesium alloy sample, and the process is simple, the cost is low, and the promotion is easy.

Description

technical field [0001] The invention belongs to the technical field of metal material microstructure observation, and in particular relates to an observation method for an internal shear band of an AZ31 magnesium alloy. Background technique [0002] Magnesium alloy is the metal structure material with the lowest density in the world, has high specific strength and specific modulus, and has broad application prospects in the fields of electronics, communications, aerospace and other fields. Magnesium alloy has a close-packed hexagonal crystal structure, so there are few independent slip systems and low plasticity at room temperature. According to different deformation conditions, the plastic deformation mechanisms of magnesium alloys are mainly divided into three types: (1) dislocation slip at high temperature; (2) twinning at low temperature; (3) shear at high strain rate. bring. Under the first two mechanisms, magnesium alloys usually exhibit continuous plastic deformatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32
CPCG01N1/2806G01N1/286G01N1/32G01N2001/2866
Inventor 张伟卢金文张于胜霍望图周宣
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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