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Heat treatment technique for rapidly conducting ageing on ZM6 magnesium alloy casting

An aging treatment, magnesium alloy technology, applied in the field of heat treatment of metal structural materials, can solve the problems of long aging time, long required time, long production cycle, etc., to achieve the effect of improving yield strength, improving production efficiency and reducing energy consumption

Active Publication Date: 2016-03-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the as-cast ZM6 magnesium alloy cannot meet the higher performance requirements of spacecraft and cutting-edge weapons. Usually, solid solution + aging heat treatment is used to improve or adjust its mechanical properties. The traditional aging process for ZM6 alloy usually has a lower temperature ( 150~200℃), aging strengthening is a process in which supersaturated solid solution atoms are slowly precipitated to form disc-shaped columnar precipitates, and it takes a long time, usually more than 10 hours. The aging treatment conditions of ZM6 magnesium alloy castings stipulated in the heat treatment of magnesium alloy castings are 195-205°C, 12-16h, the aging time is long, the production cycle is long, the energy consumption is high, and the efficiency is low

Method used

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  • Heat treatment technique for rapidly conducting ageing on ZM6 magnesium alloy casting
  • Heat treatment technique for rapidly conducting ageing on ZM6 magnesium alloy casting
  • Heat treatment technique for rapidly conducting ageing on ZM6 magnesium alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The composition of the ZM6 magnesium alloy used is (wt.%): Nd3.27%, Zn0.5%, Zr0.6%, and Mg as the balance. Cut the above-mentioned magnesium alloy into standard tensile specimens by wire cutting and put them into the box After being heated at 525°C in an electric resistance furnace, the temperature is kept for 14 hours and then water cooled. Then the water-cooled magnesium alloy tensile specimen was subjected to aging treatment, and the treatment conditions were as follows: put it into a box-type resistance furnace and heat it to 250°C, then keep it for 20 minutes, and then take it out and air-cool it.

[0019] Such as figure 1 As shown, the scanning electron micrograph of the ZM6 magnesium alloy in the as-cast state shows a large number of eutectic phases precipitated at the grain boundaries.

[0020] Such as figure 2 As shown, in the metallographic phase of the ZM6 magnesium alloy after solution treatment, the eutectic phase is almost completely dissolved.

[0021] Such as...

Embodiment 2

[0028] The composition of the ZM6 magnesium alloy used is (wt.%): Nd3.27%, Zn0.5%, Zr0.6%, and Mg as the balance. Cut the above-mentioned magnesium alloy into standard tensile specimens by wire cutting and put them into the box After being heated at 525°C in an electric resistance furnace, the temperature is kept for 14 hours and then water cooled. Then the water-cooled magnesium alloy tensile specimens were subjected to aging treatment, and the treatment conditions were as follows: put it into a box-type resistance furnace and heat it to 275°C, then keep it for 20 minutes, and then take it out and air-cool it.

[0029] Table 2 shows the test results of room temperature tensile properties of the samples heat-treated in Example 2 and Comparative Example 1.

[0030] Table 2 Room temperature mechanical properties of ZM6 magnesium alloy heat-treated in Example 2 and Comparative Example 1

[0031]

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Abstract

The invention discloses a heat treatment technique for rapidly conducting ageing on a ZM6 magnesium alloy casting and belongs to the technical field of heat treatment of metal structural materials. According to the technique, the ZM6 magnesium alloy casting is subjected to solid solution treatment at first and taken out for cooling; and the ZM6 magnesium alloy casting is subjected to the ageing treatment in a heat treatment furnace, the ageing treatment temperature is 225-325 DEG C, heat is preserved for 10 min-2 h, and the ZM6 magnesium alloy casting is taken out and cooled. According to the heat treatment technique for rapidly conducting ageing on the ZM6 magnesium alloy casting, globular phases arrayed in order are urged to form in a substrate through the short-time high-temperature treatment, and the yield strength of the ZM6 magnesium alloy casting can be obviously improved. Compared with traditional ageing treatment, the ageing treatment time is greatly shortened, the production efficiency is improved, the cost is reduced, and the heat treatment technique has important production application value.

Description

Technical field [0001] The invention relates to the technical field of heat treatment of metal structural materials, in particular to a heat treatment process for rapid aging of ZM6 magnesium alloy castings. Background technique [0002] Magnesium alloy has low density, high specific strength and specific rigidity, and has good casting and cutting process performance. And it has high damping, shock absorption and electromagnetic shielding characteristics, and its thermal conductivity is 100 times higher than that of engineering plastics, so it is particularly suitable for manufacturing electronic devices. In addition, magnesium alloy recovery is relatively easy, and the energy consumed during the recovery process is only about 5% of the energy consumed during production. Therefore, it is known as the "green engineering material of the 21st century". [0003] ZM6 is one of the Mg-RE-Zr series alloys, one of the three major series of cast magnesium alloys. It is one of the earliest...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 陈荣石吴迪王文辉柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI