Dislocation–twin interactions in nanocrystalline fcc metals
Dislocation–twin interactions in nanocrystalline fcc metals
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DOI：
10.1016/j.actamat.2010.10.028
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发表时间：
2011
期刊：
影响因子：
9.4
通讯作者：
Yuntian Zhu;Xiaolei Wu;X. Liao;J. Narayan;L. Kecskes;S. Mathaudhu
中科院分区：
文献类型：
--
作者：
Yuntian Zhu;Xiaolei Wu;X. Liao;J. Narayan;L. Kecskes;S. Mathaudhu
位错与孪晶界的相互作用和孪晶界处的位错积累可以显著提高纳米结构面心立方（fcc）金属和合金的强度和塑性。在这里，我们系统地描述合理的位错在孪晶界的相互作用。取决于位错的特性和驱动应力，在孪晶边界处可能的位错反应包括交叉滑移到孪晶平面中以引起孪晶生长或去孪晶、在孪晶边界处形成固着阶梯杆位错以及穿过孪晶边界的传输。这些位错反应的能量势垒的描述和比较。
Dislocation interaction with and accumulation at twin boundaries have been reported to significantly improve the strength and ductility of nanostructured face-centered cubic (fcc) metals and alloys. Here we systematically describe plausible dislocation interactions at twin boundaries. Depending on the characteristics of the dislocations and the driving stress, possible dislocation reactions at twin boundaries include cross-slip into the twinning plane to cause twin growth or de-twinning, formation of a sessile stair-rod dislocation at the twin boundary, and transmission across the twin boundary. The energy barriers for these dislocation reactions are described and compared.