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Title: Three-dimensional character of the deformation twin in magnesium

Abstract

Deformation twins are three-dimensional domains, traditionally viewed as ellipsoids because of their two-dimensional lenticular sections. In this work, we performed statistical analysis of twin shapes viewing along three orthogonal directions: the ‘dark side’ (DS) view along the twin shear direction (η 1), the twinning plane normal (TPN) view (k 1) and the ‘bright side’ (BS) view along the direction λ(=k 1 × η 1). Our electron back-scatter diffraction results show that twins in the DS and BS views normally exhibit a lenticular shape, whereas they show an irregular shape in the TPN view. Moreover, the findings in the TPN view revealed that twins grow faster along λ the lateral direction than along η 1 the forward propagation direction at the initial stages of twin growth. These twin sections are irregular, indicating that growth is locally controlled and the overall shape is not perfectly ellipsoidal. We explain these findings using atomistic models, and ascribe them to differences in the mobility of the edge and screw components of the twinning dislocations.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Shanghai Jiao Tong Univ. (China)
  2. Shanghai Jiao Tong Univ. (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Nebraska, Lincoln, NE (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1558214
Report Number(s):
LA-UR-18-31163
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Liu, Y., Tang, P.Z., Gong, M.Y., Mccabe, R.J., Wang, J., and Tome, C.N. Three-dimensional character of the deformation twin in magnesium. United States: N. p., 2019. Web. doi:10.1038/s41467-019-10573-7.
Liu, Y., Tang, P.Z., Gong, M.Y., Mccabe, R.J., Wang, J., & Tome, C.N. Three-dimensional character of the deformation twin in magnesium. United States. doi:10.1038/s41467-019-10573-7.
Liu, Y., Tang, P.Z., Gong, M.Y., Mccabe, R.J., Wang, J., and Tome, C.N. Thu . "Three-dimensional character of the deformation twin in magnesium". United States. doi:10.1038/s41467-019-10573-7. https://www.osti.gov/servlets/purl/1558214.
@article{osti_1558214,
title = {Three-dimensional character of the deformation twin in magnesium},
author = {Liu, Y. and Tang, P.Z. and Gong, M.Y. and Mccabe, R.J. and Wang, J. and Tome, C.N.},
abstractNote = {Deformation twins are three-dimensional domains, traditionally viewed as ellipsoids because of their two-dimensional lenticular sections. In this work, we performed statistical analysis of twin shapes viewing along three orthogonal directions: the ‘dark side’ (DS) view along the twin shear direction (η1), the twinning plane normal (TPN) view (k1) and the ‘bright side’ (BS) view along the direction λ(=k1 × η1). Our electron back-scatter diffraction results show that twins in the DS and BS views normally exhibit a lenticular shape, whereas they show an irregular shape in the TPN view. Moreover, the findings in the TPN view revealed that twins grow faster along λ the lateral direction than along η1 the forward propagation direction at the initial stages of twin growth. These twin sections are irregular, indicating that growth is locally controlled and the overall shape is not perfectly ellipsoidal. We explain these findings using atomistic models, and ascribe them to differences in the mobility of the edge and screw components of the twinning dislocations.},
doi = {10.1038/s41467-019-10573-7},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {7}
}

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