Three-dimensional character of the deformation twin in magnesium

Liu, Y.; Tang, P.Z.; Gong, M.Y.; Mccabe, R.J.; Wang, J.; Tome, C.N.

doi:10.1038/s41467-019-10573-7

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

Journal Article · Thu Jul 25 00:00:00 EDT 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-10573-7· OSTI ID:1558214

^[1]; Tang, P.Z. ^[2]; Gong, M.Y. ^[3];

^[4]; Wang, J. ^[5]; Tome, C.N. ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Shanghai Jiao Tong Univ. (China)
Shanghai Jiao Tong Univ. (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Nebraska, Lincoln, NE (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Nebraska, Lincoln, NE (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1558214

Report Number(s):: LA-UR-18-31163

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Twin hopping in nanolayered Zr-2.5Nb Zhang, Jie-Wen; Leu, Brandon; Kumar, M. Arul Taylor & Francis https://doi.org/10.6084/m9.figshare.12204653	text	January 2020

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