Cryogenic Plasticity Analysis of Mg-9Gd-4Y-0.6Zr Alloy

Xiao Yang1; Zhang Xinming2

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Cryogenic Plasticity Analysis of Mg-9Gd-4Y-0.6Zr Alloy
Vol. 30, Issue 9, Pages: 794-796(2010)
Published： 2010 ，
DOI：

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[1]肖阳,张新明.Mg-9Gd-4Y-0.6Zr合金的低温塑性分析[J].特种铸造及有色合金,2010,30(09):794-796+777-778.

Xiao Yang1, Zhang Xinming2. Cryogenic Plasticity Analysis of Mg-9Gd-4Y-0.6Zr Alloy. [J]. Special Casting & Nonferrous Alloys 30(9):794-796(2010)
[1]肖阳,张新明.Mg-9Gd-4Y-0.6Zr合金的低温塑性分析[J].特种铸造及有色合金,2010,30(09):794-796+777-778. DOI：

Xiao Yang1, Zhang Xinming2. Cryogenic Plasticity Analysis of Mg-9Gd-4Y-0.6Zr Alloy. [J]. Special Casting & Nonferrous Alloys 30(9):794-796(2010) DOI：

摘要

对Mg-9Gd-4Y-0.6Zr合金挤压T5态在-196℃条件下进行低温拉伸

低温伸长率比25℃时提高了1倍。用X射线衍射仪测定Mg-9Gd-4Y-0.6Zr合金晶格常数（c/a）

结果表明

Gd、Y元素的加入使合金挤压T5态的c/a值降低到1.6148

c/a值的变小能降低柱面滑移系的临界剪切应力

使合金在低温拉伸时进入多系滑移。用透射电镜能观察到棱柱面与基面滑移系同时启动

结果显示该合金的低温塑性好于室温塑性。

Abstract

A cryogenic plasticity phenomenon appears in the extruded-T5 treated Mg-9Gd-0.6Zr alloy with tensioning at -196℃. Elongation of the alloy at -196℃ is one time higher than that at 25℃. The lattice constant （c/a values） of Mg-9Gd-4Y-0.6Zr alloy was measured by XRD （X-ray diffraction）. The results show that c/a values of extruded-T5 treated alloys are decreased to 1.6148 with adding Gd and Y elements

and it is further decreased to 1.6113 at -196℃

which results in the occurrence of multi-system slip by decreasing the critical shearing stress of prismatic slip systems at cryogenic tension. So the cryogenic plasticity of the alloy is superior to room plasticity.