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A Heat Treatment Process for Rapid Aging of ZM6 Magnesium Alloy Castings

An aging treatment and magnesium alloy technology, applied in the field of heat treatment of metal structural materials, can solve the problems of long production cycle, long aging time, long time required, etc., and achieve the effect of easy operation, simple method and improved production efficiency.

Active Publication Date: 2017-12-26
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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  • A Heat Treatment Process for Rapid Aging of ZM6 Magnesium Alloy Castings
  • A Heat Treatment Process for Rapid Aging of ZM6 Magnesium Alloy Castings
  • A Heat Treatment Process for Rapid Aging of ZM6 Magnesium Alloy Castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The ZM6 magnesium alloy composition used is (wt.%): Nd 3.27%, Zn 0.5%, Zr 0.6%, Mg is surplus, above-mentioned magnesium alloy is cut into standard tensile sample with wire cutting, puts into box-type resistance furnace After heating at 525°C in medium temperature for 14 hours, water cooling. Then, the water-cooled magnesium alloy tensile sample was subjected to aging treatment, and the treatment conditions were as follows: put it into a box-type resistance furnace, heat it to 250°C, keep it warm for 20 minutes, take it out, and then air-cool it.

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

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

[0021] like image 3 As shown, after aging treatment, some spherical...

Embodiment 2

[0028] The ZM6 magnesium alloy composition used is (wt.%): Nd 3.27%, Zn 0.5%, Zr 0.6%, Mg is surplus, above-mentioned magnesium alloy is cut into standard tensile sample with wire cutting, puts into box-type resistance furnace After heating at 525°C in medium temperature for 14 hours, water cooling. Then, the water-cooled magnesium alloy tensile sample was subjected to aging treatment, and the treatment conditions were as follows: put it into a box-type resistance furnace, heat it to 275°C, keep it warm for 20 minutes, take it out, and then air-cool it.

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

[0030] Table 2 Mechanical Properties of ZM6 Magnesium Alloy at Room Temperature Through Example 2 and Comparative Example 1 Heat Treatment

[0031]

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Abstract

The invention discloses a heat treatment process for rapid aging of ZM6 magnesium alloy castings, belonging to the technical field of heat treatment of metal structural materials. In this process, the ZM6 magnesium alloy casting is first subjected to solid solution treatment, taken out and cooled; then it is subjected to aging treatment in a heat treatment furnace at a temperature of 225-325°C, kept for 10min-2h, taken out and then cooled. The present invention uses short-term high-temperature treatment to promote the formation of spherical phases arranged in an orderly manner in the matrix, which can significantly increase the yield strength of ZM6 magnesium alloy castings, greatly shorten the aging treatment time compared with traditional aging treatment, improve production efficiency, reduce Cost, has important production and 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 stiffness, and has good casting and cutting process performance. And it has high damping and shock absorption and electromagnetic shielding properties, and its thermal conductivity is 100 times higher than that of engineering plastics, so it is especially suitable for manufacturing electronic devices. In addition, magnesium alloy recycling is relatively easy, and the energy consumed in the recycling process is only about 5% of the energy consumed in production. Therefore, it is known as "the green engineering material of the 21st century". [0003] ZM6 is one of the Mg-RE-Zr alloys, one of the three major series of cast magnesium alloys. It is one of the earliest and best...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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