High-strength magnesium alloy and method for preparing high-strength magnesium alloy by inducing orientation of precipitated phase to change

A magnesium alloy, high-strength technology, applied in the field of magnesium alloys, can solve the problems of reduced strengthening effect, slip resistance of magnesium base surface, etc., and achieve the effect of improving strength

Inactive Publication Date: 2016-05-18
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Along the magnesium cone or prism face The precipitated second phase will hinder the sliding of the magnesium basal plane and thus improve the room temperature strength of the magnesium alloy, while the second phase precipitated along the magnesium basal plane (0001) will greatly reduce its strengthening effect

Method used

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  • High-strength magnesium alloy and method for preparing high-strength magnesium alloy by inducing orientation of precipitated phase to change
  • High-strength magnesium alloy and method for preparing high-strength magnesium alloy by inducing orientation of precipitated phase to change
  • High-strength magnesium alloy and method for preparing high-strength magnesium alloy by inducing orientation of precipitated phase to change

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Experimental program
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Effect test

Embodiment 1

[0022] A high-strength magnesium alloy is composed of the following components by weight: 5.0% tin, 3.02% zinc, 0.15% unavoidable impurities, and 91.83% magnesium.

[0023] A method of inducing and changing the precipitation phase to prepare high-strength magnesium alloys:

[0024] a. Melting: in SF 6 +CO 2 Under the protection of the gas, in the cast iron crucible, the industrial pure magnesium is smelted at 720°C according to the above weight ratio. The preheating temperature is about 200℃ before adding zinc and industrial pure tin. After the alloy is melted, stir evenly, let the melt stand at 720°C for 10 minutes, and remove the scum on the surface, and pour it in an iron mold preheated to 250°C at 720°C to prepare an ingot .

[0025] b. Alloy homogenization: heat the above-mentioned ingot at 400°C for 3 hours first to eliminate the segregation structure of the alloy, and then rise to the homogenization temperature of the alloy at 450°C, and the heating rate is 100°C / h....

Embodiment 2

[0028] A high-strength magnesium alloy is composed of the following components by weight: 2.0% of tin, 5.0% of zinc, 0.10% of unavoidable impurities, and 92.9% of magnesium.

[0029] A method of inducing and changing the precipitation phase to prepare high-strength magnesium alloys:

[0030] a. Melting: in SF 6 +CO 2 Under the protection of the gas, in the cast iron crucible, the industrial pure magnesium is smelted at 740°C according to the above weight ratio. After the pure magnesium is completely melted and the temperature is stable at 740°C, add industrial pure zinc and industrial pure tin, industrial pure zinc and industrial The preheating temperature is about 350°C before adding pure tin. After the alloy is melted, stir evenly, let the melt stand at 720°C for 20 minutes, and remove the scum on the surface, and pour it in an iron mold preheated to 350°C at 720°C to prepare an ingot .

[0031] b. Alloy homogenization: heat the above-mentioned ingot at 400°C for 3 hours...

Embodiment 3

[0034] A high-strength magnesium alloy is composed of the following components by weight: 4.0% tin, 0.5% zinc, 0.12% unavoidable impurities, and 95.38% magnesium.

[0035] A method of inducing and changing the precipitation phase to prepare high-strength magnesium alloys:

[0036] a. Melting: in SF 6 +CO 2 Under the protection of the gas, in the cast iron crucible, the industrial pure magnesium is smelted at 730°C according to the above weight ratio. After the pure magnesium is completely melted and the temperature rises to 740°C, add industrial pure zinc and industrial pure tin. And the preheating temperature is about 250℃ before adding industrial pure tin. After the alloy is melted, stir evenly, let the melt stand at 720°C for 15 minutes, and remove the scum on the surface, and pour it in an iron mold preheated to 280°C at 720°C to prepare an ingot .

[0037] b. Alloy homogenization: heat the above-mentioned ingot at 400°C for 3 hours first to eliminate the segregation s...

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Abstract

The invention discloses high-strength magnesium alloy. The high-strength magnesium alloy is prepared from, by weight, 2.0%-5.0% of tin, 0.5%-5.0% of zinc, 0-0.15% of inevitable impurities and the balance magnesium. The high-strength magnesium alloy has the Mg2Sn precipitated phase which is precipitated along the conical surface or the prismatic surface of the magnesium. A method for preparing the high-strength magnesium alloy by inducing the orientation of the precipitated phase to change comprises the following steps that a, smelting is conducted; b, alloy is homogenized; and C, heat treatment is conducted on an extruded bar. According to the method for preparing the high-strength magnesium alloy by inducing the orientation of the precipitated phase to change, the high-strength magnesium alloy is prepared by adding the alloy element Zn for achieving aging precipitation of MgZn2 in advance, the Mg2Sn precipitated phase is not completely parallel to the base plane any more, and a second phase which is precipitated along the conical surface or the prismatic surface of the magnesium is obtained, so that the orientation relationship between the Mg2Sn precipitated phase and a magnesium matrix is changed, and the strength of the magnesium alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, and in particular relates to a high-strength magnesium alloy and a method for preparing a high-strength magnesium alloy by inducing and changing the precipitation phase direction. Background technique [0002] At present, heat-treatable and strengthened commercial magnesium alloys such as AZ series, ZK series and Mg-RE alloys have the disadvantages of low strength, non-weldability and high cost, which largely limit their application in aviation, aerospace, national defense and military industries. Especially for civilian applications such as automobiles, 3C and other fields. High-strength ZK-series magnesium alloys that can be strengthened by heat treatment, although the precipitated phase Mg 2 Zn has a good aging strengthening effect, but its cost is high due to its Zr content, and it has non-weldability due to its high Zn content. However, age-strengthenable Mg-Sn-based alloys may ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
CPCC22C23/00C22C1/02C22F1/002C22F1/06
Inventor 罗素琴潘复生汤爱涛蒋斌李鑫刘文君董含武程仁菊
Owner CHONGQING ACADEMY OF SCI & TECH
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