Twining Superplasticity of Mg-9Gd-4Y-0.6Zr Alloy

Xiao Yang1; Zhang Xinming2

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Twining Superplasticity of Mg-9Gd-4Y-0.6Zr Alloy
Vol. 30, Issue 10, Pages: 958-961(2010)
Published： 2010 ，
DOI：

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[1]肖阳,张新明.Mg-9Gd-4Y-0.6Zr合金的孪晶超塑性[J].特种铸造及有色合金,2010,30(10):958-961+986.

Xiao Yang1, Zhang Xinming2. Twining Superplasticity of Mg-9Gd-4Y-0.6Zr Alloy. [J]. Special Casting & Nonferrous Alloys 30(10):958-961(2010)
[1]肖阳,张新明.Mg-9Gd-4Y-0.6Zr合金的孪晶超塑性[J].特种铸造及有色合金,2010,30(10):958-961+986. DOI：

Xiao Yang1, Zhang Xinming2. Twining Superplasticity of Mg-9Gd-4Y-0.6Zr Alloy. [J]. Special Casting & Nonferrous Alloys 30(10):958-961(2010) DOI：

摘要

对Mg-9Gd-4Y-0.6Zr合金Ext-T5态进行高温拉伸时发现

合金在400℃时产生孪晶超塑性

在晶界上有大量的再结晶和晶内有大量的孪晶共存的奇异现象;孪晶的生成调整了晶粒取向并释放了变形过程中产生的局部应力集中

导致组织中不产生裂纹和空洞;合金的变形机制是一种新的超塑性变形机制

即在晶界上以再结晶方式进行晶界滑移和在晶内以孪生方式进行协调的超塑性变形机制。

Abstract

There exists twining superplasticity in extruded-T5treated Mg-9Gd-4Y-0.6Zr alloy during tensile testing at 400℃

meanwhile

a new phenomenon is observed that a great deal of fine recrystallized grain is presented and a lot of twins occur in grains.Creation of twin grain can adjust grain orientation and release local stress concentration during deformation process

resulting in the crack free and void free in the microstructure.Deformation mechanism of the alloy at 400℃is a new superplasticity mechanism

which exhibits slipping in form of recrystallization on grain boundary and coordination in form of twin in grain.