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A heat treatment strengthened high-strength cast magnesium alloy and its preparation method

A casting magnesium alloy, high-strength technology, applied in the field of metal material magnesium alloy, can solve the problem of high cost, achieve the effect of improving corrosion resistance, improving ignition point and oxidation resistance, and reducing heat performance

Active Publication Date: 2017-08-25
山东山科智镁新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of alloy contains a large amount of rare earth elements, and the cost is extremely high. It is mainly used in aerospace and military fields

Method used

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  • A heat treatment strengthened high-strength cast magnesium alloy and its preparation method
  • A heat treatment strengthened high-strength cast magnesium alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The alloy composition (weight fraction) is: 8.0% Zn, 3.0% Al, 2.0% Sn, 1.0% Cu, 0.5% Mn, 0.5% Ca, and the rest are Mg and unavoidable impurity elements.

[0030] (1) Preheating pure magnesium, pure zinc, pure aluminum, pure tin and magnesium-manganese master alloy at 100-150°C for 20-30 minutes, and drying;

[0031] (2) Melt pure magnesium under gas protection. After melting, when the melt temperature is 700-720°C, add pure zinc, pure aluminum, pure tin and magnesium-manganese intermediate alloy to the melt, and then stir until the alloy elements are completely Dissolve in the melt, raise the temperature of the melt to 730-750°C and keep it warm for 20-30 minutes, then cool down to 680-730°C;

[0032] (3) Under gas protection, pour the melt into a metal mold for casting to form an ingot.

[0033] (4) The alloy obtained in step (3) is solution treated at 360° C. for 12 hours, cooled in air, and aged at 200° C. for 16 hours to obtain a high-strength cast magnesium alloy....

Embodiment 2

[0038] The alloy composition (weight fraction) is: 10.0% Zn, 1.0% Al, 1.0% Sn, 0.5% Cu, 0.5% Mn, 0.5% Ca, and the rest are Mg and unavoidable impurity elements.

[0039] (1) Preheating pure magnesium, pure zinc, pure aluminum, pure tin and magnesium-manganese master alloy at 100-150°C for 20-30 minutes, and drying;

[0040] (2) Melt pure magnesium under gas protection. After melting, when the melt temperature is 700-720°C, add pure zinc, pure aluminum, pure tin and magnesium-manganese intermediate alloy to the melt, and then stir until the alloy elements are completely Dissolve in the melt, raise the temperature of the melt to 730-750°C and keep it warm for 20-30 minutes, then cool down to 680-730°C;

[0041] (3) Under gas protection, pour the melt into a metal mold for casting to form an ingot.

[0042] (4) The alloy obtained in step (3) was solution treated at 380° C. for 10 hours, cooled in air, and aged at 175° C. for 16 hours to obtain a high-strength cast magnesium allo...

Embodiment 3

[0045]The alloy composition (weight fraction) is: 9.0% Zn, 1.0% Al, 3.0% Sn, 0.5% Cu, 0.5% Mn, 0.3% Ca, and the rest are Mg and unavoidable impurity elements.

[0046] (1) Preheating pure magnesium, pure zinc, pure aluminum, pure tin and magnesium-manganese master alloy at 100-150°C for 20-30 minutes, and drying;

[0047] (2) Melt pure magnesium under gas protection. After melting, when the melt temperature is 700-720°C, add pure zinc, pure aluminum, pure tin and magnesium-manganese intermediate alloy to the melt, and then stir until the alloy elements are completely Dissolve in the melt, raise the temperature of the melt to 730-750°C and keep it warm for 20-30 minutes, then cool down to 680-730°C;

[0048] (3) Under gas protection, pour the melt into a metal mold for casting to form an ingot.

[0049] (4) The alloy obtained in step (3) is solution treated at 360° C. for 12 hours, cooled in air, and aged at 200° C. for 16 hours to obtain a high-strength cast magnesium alloy. ...

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Abstract

The invention provides a heated and reinforced high-strength cast magnesium alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 8.0-10.0 of Zn, 1.0-5.0 of Al, 1.0-5.0 of Sn, 0.1-1.0 of Cu, 0.3-0.8 of Mn, 0.3-0.5 of Ca, and the balance of Mg and inevitable impurity elements. According to the high-strength cast magnesium alloy, under a room-temperature stretch test, the tensile strength reaches 320-350 MPa, and the yield strength reaches 220-260 MPa. A heat treatment process of the magnesium alloy comprises solution treatment by 4-8 hours at a temperature of 330-380 DEG C, air cooling, aging by 8-16 hours at a temperature of 150-220 DEG C and obtaining of the high-strength cast magnesium alloy. The heat treatment process of the alloy is simple and easy to realize; and the aging treatment can form a lot of nanoscale strengthening phases in an alloy structure, so that the alloy strength can be prominently improved. The alloy contains no such noble metal as rare earth, and is an alloy system with low cost and wide applicability.

Description

technical field [0001] The invention relates to the field of metal material magnesium alloys, in particular to a heat treatment strengthened high-strength cast magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structural material in practical application at present, magnesium alloy has many excellent properties, such as low density, high specific strength and specific stiffness, and good electromagnetic shielding and shock absorption performance. It is known as "the most potential for development in the 21st century." and promising green engineering materials”, in the face of the global energy crisis and environmental pollution, magnesium alloys present good prospects for development in many industrial fields. [0003] At present, more than 80% of the magnesium alloy parts currently used are formed by casting, and the main application field is the automobile industry. At present, the commercial magnesium alloy grades used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 周吉学吴建华赵东清王金伟刘运腾李卫红刘玉
Owner 山东山科智镁新材料科技有限公司
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