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影响因子：9.5

DOI码：10.1021/acs.nanolett.2c03852

发表刊物：Nano Letters

关键字：5-fold twin; in situ nanomechanical testing; grain boundary; decomposition partial dislocation

摘要：A 5-fold twin is usually observed in nanostructured metals after mechanical tests and/or annealing treatment. However, the formation mechanism of a 5-fold twin has not been fully elaborated, due to the lack of direct time-resolved atomic-scale observation. Here, by using in situ nanomechanical testing combined with atomistic simulations, we show that sequential twinning slip in varying slip systems and decomposition of high-energy grain boundaries account for the 5-fold twin formation in a nanoscale gold single crystal under bending as well as the reversible formation and dissolution of a 5-fold twin in a nanocrystal with a preexisting twin under tension and shearing. Moreover, we find that the complex stress state in the neck area results in the breakdown of Schmid’s law, causing 5-fold twin formation in a gold nanocrystal with a twin boundary parallel to the loading direction. These findings enrich our understanding of the formation process of high-order twin structures in nanostructured metals.

合写作者：Christopher R Weinberger

第一作者：Xiang Wang, SixueZheng

论文类型：期刊论文

通讯作者：Chuang Deng,Guofeng Wang, Scott X Mao

学科门类：工学

文献类型：J

卷号：23

期号：2

页面范围：514−522

是否译文：否

发表时间：2023-01-12

收录刊物：SCI

发布期刊链接：https://pubs.acs.org/doi/full/10.1021/acs.nanolett.2c03852