Twinning and Detwinning during Cyclic Deformation of Mg Alloy AZ31B
Twinning and Detwinning during Cyclic Deformation of Mg Alloy AZ31B
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DOI：
10.4028/www.scientific.net/msf.539-543.3407
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
D. Brown;A. Jain;S. Agnew;B. Clausen
中科院分区：
文献类型：
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作者：
D. Brown;A. Jain;S. Agnew;B. Clausen
变形镁合金由于机械孪晶而表现出拉压强度的不对称性。这种区别是由于材料的变形主要是在一个方向上滑动而在另一个方向上孪生而产生的。在挤压杆的拉伸和压缩循环加载过程中，原位中子衍射允许研究孪晶对随后的载荷逆转的影响。衍射数据揭示了织构的演变和内应力的发展是变形的函数。在初始循环中，去孪生导致织构完全反转，但最终“疲劳”导致一些残余的孪生成分。
Textured Mg alloys exhibit tension – compression strength asymmetry due to mechanical twinning. The distinction arises as the material deforms primarily by slip in one direction and by twinning in the other. In-situ neutron diffraction during cyclic loading in tension and compression of extruded bar allows study of the effect of twinning on subsequent load reversals. The diffraction data reveal the texture evolution and internal stress development as a function of deformation. De-twinning resulted in complete texture reversal during initial cycles, but eventually “fatigued” resulting in some residual twin component.