Formation of Single and Multiple Deformation Twins in Nanocrystalline fcc Metals
Formation of Single and Multiple Deformation Twins in Nanocrystalline fcc Metals
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DOI：
10.1016/j.actamat.2009.04.020
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发表时间：
2009-05
期刊：
影响因子：
9.4
通讯作者：
Yuntian Zhu;J. Narayan;J. Hirth;S. Mahajan;Xiaolei Wu;Xiaozhou Liao
中科院分区：
文献类型：
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作者：
Yuntian Zhu;J. Narayan;J. Hirth;S. Mahajan;Xiaolei Wu;Xiaozhou Liao
在纳米结构面心立方(FCC)金属中，经常观察到形变孪晶彼此相遇，形成多重孪晶。在这里，我们提出了四个不同的单孪晶和多孪晶的形核和生长的两种机制。这些机制为孪晶形核后的生长提供了连续的孪生部分。需要一个相对较高的应力或高应变率来激活这些机制，使它们在纳米晶材料中比在粗晶材料中更普遍。给出了支持所提出机制的实验观察结果。
Deformation twins are often observed to meet each other to form multi-fold twins in nanostructured face-centered cubic (fcc) metals. Here we propose two types of mechanism for the nucleation and growth of four different single and multiple twins. These mechanisms provide continuous generation of twinning partials for the growth of the twins after nucleation. A relatively high stress or high strain rate is needed to activate these mechanisms, making them more prevalent in nanocrystalline materials than in their coarse-grained counterparts. Experimental observations that support the proposed mechanisms are presented.