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Method for refining crystal grains of magnesium alloy plate

A technology for refining grains and magnesium alloy plates, which is applied in the field of preparation of magnesium alloy grains through multiple cycles of "cold rolling-annealing" method, can solve the problems that are not suitable for commercial production, and achieve fine grains , refined grain size, high strength and plasticity

Inactive Publication Date: 2011-03-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have been proven to refine grains, many such methods are not suitable for commercial production due to their own process limitations

Method used

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  • Method for refining crystal grains of magnesium alloy plate
  • Method for refining crystal grains of magnesium alloy plate
  • Method for refining crystal grains of magnesium alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 The preparation process of magnesium alloy sheet grain refinement is as attached figure 1 As shown, a 2mm thick AZ31 magnesium alloy sheet is used. First, the magnesium alloy sheet is homogenized, heated to 350°C and kept for 6 hours. The metallographic microscope shows that the grain size is 80μm; the processed magnesium alloy sheet is cooled Rolling, the rolling speed is 20m / min, the amount of deformation (rolling amount) is 10%, and a plate with a thickness of 1.8mm is obtained; then the cold-rolled plate is annealed, and the annealing process is 350°C for 0.5 hours. Observe the grain size of the sample with a metallurgical microscope. After the first round of cold rolling and annealing, the grain size of the plate is 35μm;

[0036] The AZ31 magnesium alloy sheet prepared above is subjected to the second cold rolling and annealing treatment. First, cold-roll the 1.8mm-thick plate at a rolling speed of 20m / min and a reduction of 15% to obtain a plate with a ...

Embodiment 2

[0038] Using 1mm thick AZ31 magnesium alloy sheet, the magnesium alloy sheet is first homogenized, heated to 400℃ and kept for 12 hours, the metallographic microscope shows that the grain size is 100μm; the processed magnesium alloy sheet is cold rolled and rolled The production speed is 15m / min, the rolling reduction is 12%, and a sheet with a thickness of 0.88mm is obtained; then the cold-rolled sheet is annealed, the annealing process is 300°C for 0.5 hours, and the sample is observed with a metallographic microscope The grain size, the grain size of the plate obtained after the first round of cold rolling and annealing is 30 μm.

[0039] The AZ31 magnesium alloy sheet prepared above is subjected to the second cold rolling and annealing treatment. First, cold-roll a 0.88mm thick plate at a rolling speed of 25m / min and a rolling reduction of 15% to obtain a plate with a thickness of 0.75mm; then the cold-rolled plate is annealed with an annealing process of 280 The temperature...

Embodiment 3

[0041] Using 2mm thick AZ61 magnesium alloy sheet, the magnesium alloy sheet is homogenized first, heated to 400°C and kept for 12 hours, the metallographic microscope shows that the grain size is 60μm; the processed magnesium alloy sheet is cold rolled and rolled The production speed is 12m / min, the rolling reduction is 8%, and a plate with a thickness of 1.84mm is obtained; then the cold-rolled plate is annealed, and the annealing process is 310℃ for 0.5 hours. The sample is observed with a metallurgical microscope The grain size, the grain size of the plate obtained after the first cold rolling and annealing is 35 μm.

[0042] The AZ61 magnesium alloy sheet prepared above is subjected to the second cold rolling and annealing treatment. First, cold-roll a 1.84mm thick plate at a rolling speed of 20m / min and a rolling reduction of 12% to obtain a plate with a thickness of 1.62mm. Then, the cold-rolled plate is annealed with an annealing process of 270 The temperature is kept fo...

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Abstract

The invention relates to a method for refining crystal grains of a magnesium alloy plate, in particular to a preparation method for refining the crystal grains of the magnesium alloy plate by a circular cold rolling-annealing method. In the method, the magnesium alloy plate with refined crystal grains is obtained by repeatedly circulating cold rolling deformation and annealing according to such a rule that next cold rolling deformation is more than previous deformation and next annealing temperature is lower than the previous processing temperature, wherein the magnesium alloy plate comprises 0.1 to 10 weight percent of alloy element; and the size of the crystal grains of the magnesium alloy plate is greatly refined through several cold rolling deformation and annealing processes. The method is low in cost and simple in operation, can be used for mass production and is a method for economically and effectively preparing the magnesium alloy plate; and the magnesium alloy plate prepared by the method has the characteristics of low cost, high strength and plasticity and the like, and can be widely applied to various fields such as automobiles, aviation, communication, buildings and the like.

Description

technical field [0001] The invention relates to a method for refining magnesium alloy grains, in particular to a preparation method for refining magnesium alloy grains through multiple cycles of "cold rolling-annealing". [0002] Background technique [0003] Magnesium alloy is the lightest alloy among practical metals. Magnesium alloy is 36% lighter than aluminum alloy, 73% lighter than zinc alloy, and 77% lighter than steel. It is the metal with the highest specific strength among practical metals. Magnesium alloys are widely used in portable equipment and the automotive industry to achieve lightweight purposes. For example: the size of LCD screens on mobile phones and notebook computers is increasing year by year, and magnesium alloys are used on their support frames and back shells. Although the specific gravity of magnesium alloy is heavier than that of plastic, the strength and elastic rate per unit weight are higher than that of plastic. Therefore, in the case of ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 陈兴品林震霞肖睿孙灿陈雪尚都刘庆
Owner CHONGQING UNIV
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