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Title: Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials

Abstract

Hexagonal close packed (HCP) Mg and Zr are being used in transportation and nuclear industries, respectively. The ductility and formability of these materials is significantly limited by the activation of prevalent deformation twinning. Twins in HCP polycrystals usually nucleate at grain boundaries (GBs), propagate into the grain, and they either terminate at opposing GBs (isolated-twins) or transmit into a neighboring grain (adjoining-twin-pairs: ATPs). Because twin interfaces provide a path for crack propagation, twin transmission is relevant to material ductility. This study combines electron backscatter diffraction (EBSD) based statistical analysis of twinning microstructures and crystal plasticity modeling, to characterize twin thickening processes away from and near GBs. Analysis of deformed Mg and Zr microstructures reveals that local twin thicknesses at GBs are statistically larger for ATPs compared to isolated-twins. Further, thicknesses are found to decrease with increasing GB misorientation angle. Full-field Fast-Fourier-Transform micromechanics modeling shows that shear-transformation induced backstress are locally relaxed at GBs for ATPs, but not for isolated-twins. As a consequence, ATPs can thicken locally at GBs and the preferential site for twin thickening shifts from the middle of the twin to common GB.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (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:
1530793
Report Number(s):
LA-UR-18-26101
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mariyappan, Arul Kumar, Capolungo, Laurent, Mccabe, Rodney James, and Tome, Carlos. Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials. United States: N. p., 2019. Web. doi:10.1038/s41598-019-40615-5.
Mariyappan, Arul Kumar, Capolungo, Laurent, Mccabe, Rodney James, & Tome, Carlos. Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials. United States. doi:10.1038/s41598-019-40615-5.
Mariyappan, Arul Kumar, Capolungo, Laurent, Mccabe, Rodney James, and Tome, Carlos. Thu . "Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials". United States. doi:10.1038/s41598-019-40615-5. https://www.osti.gov/servlets/purl/1530793.
@article{osti_1530793,
title = {Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials},
author = {Mariyappan, Arul Kumar and Capolungo, Laurent and Mccabe, Rodney James and Tome, Carlos},
abstractNote = {Hexagonal close packed (HCP) Mg and Zr are being used in transportation and nuclear industries, respectively. The ductility and formability of these materials is significantly limited by the activation of prevalent deformation twinning. Twins in HCP polycrystals usually nucleate at grain boundaries (GBs), propagate into the grain, and they either terminate at opposing GBs (isolated-twins) or transmit into a neighboring grain (adjoining-twin-pairs: ATPs). Because twin interfaces provide a path for crack propagation, twin transmission is relevant to material ductility. This study combines electron backscatter diffraction (EBSD) based statistical analysis of twinning microstructures and crystal plasticity modeling, to characterize twin thickening processes away from and near GBs. Analysis of deformed Mg and Zr microstructures reveals that local twin thicknesses at GBs are statistically larger for ATPs compared to isolated-twins. Further, thicknesses are found to decrease with increasing GB misorientation angle. Full-field Fast-Fourier-Transform micromechanics modeling shows that shear-transformation induced backstress are locally relaxed at GBs for ATPs, but not for isolated-twins. As a consequence, ATPs can thicken locally at GBs and the preferential site for twin thickening shifts from the middle of the twin to common GB.},
doi = {10.1038/s41598-019-40615-5},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Tensile twinning microstructure in HCP metals. Electron backscatter diffraction (EBSD) image of (a) Mg compressed to 3% strain at 273 K and (b) Zr compressed to 10% strain at 77 K shows extensive activation of {10$\bar{1}$2} tensile twinning. EBSD images are cleaned using Grain confidence index (CI) standardizationmore » cleanup followed by an iterative Neighbor CI correlation with a minimum CI of 0.3. A few isolated (yellow) and ATPs (black) twins are marked.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.