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影响因子：18.9

DOI码：10.1038/s41467-024-44837-8

发表刊物：Nature Communications

摘要：Twinning is an essential mode of plastic deformation for achieving superior strength and ductility in metallic nanostructures. It has been generally believed that twinning-induced plasticity in body-centered cubic (BCC) metals is controlled by twin nucleation, but facilitated by rapid twin growth once the nucleation energy barrier is overcome. By performing in situ atomic-scale transmission electron microscopy straining experiments and atomistic simulations, we find that deformation twinning in BCC Ta nanocrystals larger than 15 nm in diameter proceeds by reluctant twin growth, resulting from slow advancement of twinning partials along the boundaries of finite-sized twin structures. In contrast, reluctant twin growth can be obviated by reducing the nanocrystal diameter to below 15 nm. As a result, the nucleated twin structure penetrates quickly through the cross section of nanocrystals, enabling fast twin growth via facile migration of twin boundaries leading to large uniform plastic deformation. The present work reveals a size-dependent transition in the nucleation- and growth-controlled twinning mechanism in BCC metals, and provides insights for exploiting twinning-induced plasticity and breaking strength-ductility limits in nanostructured BCC metals.

合写作者：Yin Zhang, Xiang Wang

第一作者：Li Zhong

论文类型：期刊论文

通讯作者：Ting Zhu, Scott X. Mao

学科门类：工学

文献类型：J

卷号：15

期号：1

页面范围：560

是否译文：否

发表时间：2024-01-16

收录刊物：SCI

发布期刊链接：https://www.nature.com/articles/s41467-024-44837-8