Faulted dipoles in a nanostructured 7075 Al alloy produced via high-pressure torsion
Faulted dipoles in a nanostructured 7075 Al alloy produced via high-pressure torsion
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通过高压扭转产生的纳米结构 7075 铝合金中的缺陷偶极子
DOI：
10.1016/j.msea.2019.03.081
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发表时间：
2019-04
期刊：
影响因子：
6.4
通讯作者：
Lin Yaojun
中科院分区：
文献类型：
--
作者：
Yan Zhigang;Lin Yaojun
The faulted dipoles in face-centered cubic materials have been well proposed theoretically to comprise two opposing-sign Shockley dislocations and two opposing-sign sessile stair-rod dislocations connected by three stacking faults; however, studies on them have hitherto received limited attention. In the present study, the faulted dipoles in a nanostructured Al alloy produced via high-pressure torsion were observed and identified using high resolution transmission electron microscopy. The mechanisms underlying the formation of the faulted dipoles were discussed. As strong barriers to dislocation motion, the sessile faulted dipoles present a potential to entrap dislocations, enhancing work-hardening ability and ductility of nanostructured metals and alloys.
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