In situ observation of the atomic shuffles during the {${{11}}\bar{{{2}}}{{1}}$} twinning in hexagonal close-packed rhenium

He, Yang; Fang, Zhengwu; Wang, Chongmin; Wang, Guofeng; Mao, Scott X.

doi:10.1038/s41467-024-47343-z

In situ observation of the atomic shuffles during the {$${{11}}\bar{{{2}}}{{1}}$$} twinning in hexagonal close-packed rhenium

Journal Article · Sat Apr 06 00:00:00 EDT 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-47343-z· OSTI ID:2335761

He, Yang ^[1]; Fang, Zhengwu ^[1]; ^[2]; ^[1]; ^[1]

Univ. of Pittsburgh, PA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Twinning, on par with dislocations, is critically required in plastic deformation of hexagonal close-packed crystals at low temperatures. In contrast to that in cubic-structured crystals, twinning in hexagonal close-packed crystals requires atomic shuffles in addition to shear. Though the twinning shear that is carried by twinning dislocations has been captured for decades, direct experimental observation of the atomic shuffles, especially when the shuffling mode is not unique and does not confine to the plane of shear, remains a formidable challenge to date. Here, by using in-situ transmission electron microscopy, we directly capture the atomic mechanism of the {$${{11}}\bar{{{2}}}{{1}}$$} twinning in hexagonal close packed rhenium nanocrystals. Results show that the {$${{11}}\bar{{{2}}}{{1}}$$} twinning is dominated by the ($$\textbf{b}$$_1/2, h_1/2) twinning disconnections. In contrast to conventional expectations, the atomic shuffles accompanying the twinning disconnections proceed on alternative basal planes along 1/6 {$${{1\bar1}}{{{0}}}{{0}}$$} , which may be attributed to the free surface in nanocrystal samples, leading to a lack of mirror symmetry across the {$${{11}}\bar{{{2}}}{{1}}$$} twin boundary.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

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

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2335761

Report Number(s):: PNNL-SA--193834

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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In situ observation of the atomic shuffles during the {$${{11}}\bar{{{2}}}{{1}}$$} twinning in hexagonal close-packed rhenium

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