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

CN107219105BActive Publication Date: 2020-02-07NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-02-07

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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.
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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...

Examples

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 ...