A preparation method of fine-grained magnesium alloy with superplastic deformation ability

A magnesium alloy and superplastic technology, which is applied in the field of rolling and preparation of fine-grained magnesium alloys with superplastic deformation ability, and can solve the problems of difficulty in obtaining superplastic deformation characteristics, disadvantage of sheet strength stamping and forming, and difficulty in preparing large-sized materials. , to achieve the effect of easy operation, improve forming ability and reduce cracking

Active Publication Date: 2016-01-20
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the traditional rolling method, due to its completely symmetrical upper and lower roll speeds, roll diameters and surface conditions, a strong basal texture will be produced in the rolled plate, resulting in a large grain size in the material structure, and it is difficult to obtain super Plastic deformation characteristics are very unfavorable to the strength of the plate and subsequent stamping forming, thus limiting its application
At present, the existing methods for preparing fine-grained superplastic magnesium alloys mainly include stack rolling method, spinning method, friction stir modification method, and equal channel extrusion method, etc., which are mainly used to prepare small samples for experiments, and it is difficult to prepare large-sized magnesium alloys. materials, and it is difficult to achieve large-scale mass production

Method used

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  • A preparation method of fine-grained magnesium alloy with superplastic deformation ability
  • A preparation method of fine-grained magnesium alloy with superplastic deformation ability
  • A preparation method of fine-grained magnesium alloy with superplastic deformation ability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put the commercial AZ91 magnesium alloy billet into the heating box and heat it. After the temperature rises to 380 degrees Celsius, let it stand for 100 minutes and push the magnesium alloy billet to the entrance of the roll along the transverse direction. Transverse rolling with a small reduction of 8% and 6% respectively;

[0022] (2) Put the sample rolled in the above step (1) back into the heating box, let it stand for 30 minutes, and carry out 1 pass, the different speed ratio of the upper and lower rolls is 1.3, and the single pass reduction is 35%. Longitudinal asynchronous rolling of reduction;

[0023] (3) Put the sample rolled in the above step (2) back into the heating box, let it stand for 20 minutes, and then carry out 8 passes of rolling, and carry out 180 degrees of longitudinal direction reversal after each pass of rolling;

[0024] (4) The temperature of the heating box is reduced to 210 degrees centigrade, the sample after the rolling of the abov...

Embodiment 2

[0027] (1) Put the commercial AZ91 magnesium alloy extrusion billet into the heating box and heat it. After the temperature rises to 350 degrees Celsius, let it stand for 80 minutes and push the magnesium alloy billet to the entrance of the roll along the transverse direction for 2 passes and single pass. Transverse rolling with small reductions of 7% and 6% respectively;

[0028] (2) Put the sample rolled in the above step (1) back into the heating box, let it stand for 50 minutes, and carry out 1 pass, the different speed ratio of the upper and lower rolls is 1.4, and the single pass reduction is 38%. Longitudinal asynchronous rolling of reduction;

[0029] (3) Put the sample rolled in the above step (2) back into the heating box, let it stand for 15 minutes, and then carry out 10 passes of rolling, and carry out 180 degrees of longitudinal direction reversal after each pass of rolling;

[0030] (4) The temperature of the heating box is reduced to 170 degrees centigrade, th...

Embodiment 3

[0033] (1) Put the commercial AZ61 magnesium alloy billet into the heating box and heat it. After the temperature rises to 320 degrees Celsius, let it stand for 145 minutes and push the magnesium alloy billet to the entrance of the roll along the transverse direction. The reductions are respectively 6%, 7%, 6% and small reduction transverse rolling;

[0034] (2) Put the sample rolled in the above step (1) back into the heating box, let it stand for 17 minutes, and carry out 1 pass, the different speed ratio of the upper and lower rolls is 1.1, and the single pass reduction is 29%. Longitudinal asynchronous rolling of reduction;

[0035] (3) Put the sample rolled in the above step (2) back into the heating box, let it stand for 30 minutes, and then carry out 7 passes of rolling, and carry out 180-degree longitudinal direction reversal after each rolling pass;

[0036] (4) The temperature of the heating box is reduced to 290 degrees centigrade, the sample after the rolling of t...

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Abstract

The invention relates to a method for rolling fine-grained magnesium alloy with superplastic deformability. The method comprises the steps of low-rolling-reduction transverse rolling, high-rolling-reduction longitudinal asynchronous rolling, longitudinal reversed-direction rolling, low-temperature longitudinal rolling and annealing, and comprises the specific steps of heating a commercial magnesium alloy blank in a heating box, standing to preserve heat for a period of time after heating to a preset temperature, firstly pushing the magnesium alloy blank to an entrance of a rolling roller along the transverse direction, carrying out transverse rolling firstly, then, carrying out high-rolling-reduction longitudinal asynchronous rolling, then, carrying out longitudinal 180-degree-reversed rolling, then, carrying out low-temperature longitudinal rolling, and finally, carrying out low-temperature long-time annealing treatment or high-temperature short-time annealing treatment. According to the method, cracking during the rolling of the magnesium alloy can be reduced, the crystal grain of the magnesium alloy is refined, the texture is weakened, and the high-temperature plasticity of the magnesium alloy is improved; moreover, the process is simple and easy to operate, large-sized wide-width sheet materials can be prepared, and the formability of the magnesium alloy is improved remarkably, so that the method is applicable to the mass production of superplastic magnesium alloy and is prone to popularization and application.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a rolling preparation method of a fine-grained magnesium alloy with superplastic deformation capability. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering applications. It has light specific gravity, high specific strength and specific stiffness, good damping, thermal conductivity, machinability, casting performance, strong electromagnetic shielding ability, stable size, rich resources, and easy With many advantages such as recycling, it is increasingly widely used in the fields of automobile industry, communication electronics industry and aerospace industry. In recent years, the annual growth rate of magnesium alloy production in the world is as high as 20%, but compared with aluminum containing gold, the forming technology of magnesium alloy needs to be further developed. Rolling is one of the most important processing and fo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22F1/06
Inventor王慧远张恩波于宏辰姜启川王金国王珵刘国军
OwnerJILIN UNIV