Unstable twin in body-centered cubic tungsten nanocrystals

Wang, Xiang; Wang, Jiangwei; He, Yang; Wang, Chongmin; Zhong, Li; Mao, Scott X.

doi:10.1038/s41467-020-16349-8

Unstable twin in body-centered cubic tungsten nanocrystals

Journal Article · Tue May 19 00:00:00 EDT 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-16349-8· OSTI ID:1638497

Wang, Xiang ^[1]; Wang, Jiangwei ^[2]; He, Yang ^[1]; ^[3]; ^[1]; ^[1]

Univ. of Pittsburgh, PA (United States)
Univ. of Pittsburgh, PA (United States); Zhejiang Univ., Hangzhou (China). Center of Electron Microscopy and State Key Lab. of Silicon Materials
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

Twinning is commonly activated in plastic deformation of low stacking fault face-centered cubic (Fcc) metals but rarely found in body-centered cubic (Bcc) metals under room temperature and slow strain rates. Here, by conducting in situ transmission electron microscopy (TEM) at atomic scale, we discovered that, in stark contrast to those in most Fcc metals, a majority of deformation twins in Bcc metals are unstable and undergo spontaneously detwinning upon unloading. Such unexpected instability of Bcc twins was found to be closely related to the prevalence of the inclined twin boundaries—a peculiar structure where twin boundaries are not parallel to the twinning plane, and the degree of instability is in direct proportion to the fraction of the inclined twin boundary. This work provides significant insights into the structure and stability of deformation twins in Bcc metals.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1638497

Report Number(s):: PNNL-SA--152500

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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