Heat Resistance of Precipitates in Mg-9Gd-4Y-0.6Zr Alloy at Elevated Temperature

Xiao Yang; Zhang Xinming; Deng Yunlai

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Heat Resistance of Precipitates in Mg-9Gd-4Y-0.6Zr Alloy at Elevated Temperature
Issue 11, Pages: 829-831(2007)
Published： 2007 ，
DOI：

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[1]肖阳,张新明,邓运来.Mg-9Gd-4Y-0.6Zr析出相在高温拉伸中的相变[J].特种铸造及有色合金,2007(11):829-831+815.

Xiao Yang, Zhang Xinming, Deng Yunlai. Heat Resistance of Precipitates in Mg-9Gd-4Y-0.6Zr Alloy at Elevated Temperature. [J]. Special Casting & Nonferrous Alloys (11):829-831(2007)
[1]肖阳,张新明,邓运来.Mg-9Gd-4Y-0.6Zr析出相在高温拉伸中的相变[J].特种铸造及有色合金,2007(11):829-831+815. DOI：

Xiao Yang, Zhang Xinming, Deng Yunlai. Heat Resistance of Precipitates in Mg-9Gd-4Y-0.6Zr Alloy at Elevated Temperature. [J]. Special Casting & Nonferrous Alloys (11):829-831(2007) DOI：

摘要

通过透射电镜观察Mg-9Gd-4Y-0.6Zr合金挤压T5态在300℃和350℃的高温短时拉伸过程中析出相的变化情况。结果表明

合金在350℃拉伸过程中（拉伸持续时间约1h）析出相没有发生转变

仍为β′相。合金在300℃和350℃拉伸时β′相从拉伸前的网状分布逐渐转变为平行于变形方向的条状分布

降低了对变形的阻力;部分溶质原子回溶造成析出相的体积分数下降;合金在300℃时拉伸过程中没有发生交滑移

而在350℃时拉伸过程中则发生交滑移现象;这些都导致合金强度和耐热性的下降。

Abstract

The precipitates change of the extruded T5 treatment Mg-9Gd-4Y-0.6Zr alloy with tensioning at 300 ℃ and 350 ℃ was observed by transmission electron microscope（TEM）.The results indicate that the precipitates phase β’ in the alloy did not transform into new equilibrium phase with tensioning at 350 ℃ for 1 hours.In the process of tension at both 300 ℃ and 350 ℃

the precipitates phase β’in the alloy was changed from network structure into strip structure parallel to deformed orientation

which can reduce the deformation resistance.Meanwhile

the re-dissolution of solute atoms in precipitates into the magnesium matrix can result in the decrease of the volume fraction of precipitates.In addition

the cross slip was observed not at 300 ℃ but at 350 ℃.All of above reasons can be responsible for the decrease of strength and heat resistance of the alloy.