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Title: Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals

Abstract

Design and processing of advanced lightweight structural alloys based on magnesium and titanium rely critically on a control over twinning which, however, remains elusive to date and is dependent on an explicit understanding on the twinning nucleation mechanism in hexagonal close-packed (HCP) crystals. Here, by using in-situ high resolution transmission electron microscopy, we directly reveal a “dual-step” twinning nucleation mechanism in HCP rhenium nanocrystals. It is found that nucleation of the predominant {10 -12} twinning is initiated by disconnections on the Prismatic¦Basal interfaces which establish the lattice correspondence of the twin with a minor deviation from the ideal orientation. Subsequently, the minor deviation is corrected by the formation of coherent twin boundaries through rearrangement of the disconnections on the Prismatic¦Basal interface; thereafter, the coherent twin boundaries propagate by twinning disconnections. The findings provide much-needed high-resolution evidences to the twinning nucleation mechanism in HCP crystals, with crucial implications for engineering advanced structural alloys.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of Pittsburgh, PA (United States)
  2. Univ. of Nevada, Reno (NV)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
OSTI Identifier:
1638496
Report Number(s):
PNNL-SA-152795
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
AC05-76RL01830; DMR 1808046; CMMI 1635088
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Metals and alloys; structural properties

Citation Formats

He, Yang, Li, Bin, Wang, Chongmin, and Mao, Scott X. Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals. United States: N. p., 2020. Web. https://doi.org/10.1038/s41467-020-16351-0.
He, Yang, Li, Bin, Wang, Chongmin, & Mao, Scott X. Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals. United States. https://doi.org/10.1038/s41467-020-16351-0
He, Yang, Li, Bin, Wang, Chongmin, and Mao, Scott X. Mon . "Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals". United States. https://doi.org/10.1038/s41467-020-16351-0. https://www.osti.gov/servlets/purl/1638496.
@article{osti_1638496,
title = {Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals},
author = {He, Yang and Li, Bin and Wang, Chongmin and Mao, Scott X.},
abstractNote = {Design and processing of advanced lightweight structural alloys based on magnesium and titanium rely critically on a control over twinning which, however, remains elusive to date and is dependent on an explicit understanding on the twinning nucleation mechanism in hexagonal close-packed (HCP) crystals. Here, by using in-situ high resolution transmission electron microscopy, we directly reveal a “dual-step” twinning nucleation mechanism in HCP rhenium nanocrystals. It is found that nucleation of the predominant {10 -12} twinning is initiated by disconnections on the Prismatic¦Basal interfaces which establish the lattice correspondence of the twin with a minor deviation from the ideal orientation. Subsequently, the minor deviation is corrected by the formation of coherent twin boundaries through rearrangement of the disconnections on the Prismatic¦Basal interface; thereafter, the coherent twin boundaries propagate by twinning disconnections. The findings provide much-needed high-resolution evidences to the twinning nucleation mechanism in HCP crystals, with crucial implications for engineering advanced structural alloys.},
doi = {10.1038/s41467-020-16351-0},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {5}
}

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