Title: Numerical and experimental characterization of twin transmission across grain boundaries along the forward and lateral directions

Abstract

Pervasive deformation twinning and transmission events across grain boundaries (GBs) affect the strength and failure of hexagonal close-packed (HCP) magnesium. A three-dimensional twin can transmit along the twinning shear direction, (forward), and along the direction perpendicular to both the twinning plane normal and the shear direction, (lateral). For the first time, phase-field calculations and electron backscatter diffraction (EBSD)-based statistical analysis are combined to investigate the effect of the twinned grain boundary characteristics on twin transmission (TT) along the forward and lateral directions. This combined analysis reveals that TT propensity decreases with increasing misorientation angle across the GB for both forward and lateral directions. Also, the TT is more favorable along the lateral than along the forward direction. Twin transmission seems harder across GBs with a misorientation axis closer to the twin -direction than the other directions ( and ). Further, the PF calculations reveal that, at the onset of a transmission process, the crystallography tends to be preserved in the case of lateral transmission, whereas, in the forward transmission case, the transmitted twin punches straight through the GBs and its morphology prevails. Additionally, the EBSD analysis finds that pure forward and lateral transmissions do not occur often, yet reveals amore » preference for lateral propagation consistent with PF simulations. Further, the local twin transmission configurations observed in the actual material do not correspond to pure tilt or twist GBs, which are most commonly considered as model cases.« less

Authors:

Arul Kumar, M.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-1686-3391"

Dang, K.  ^[1];

• Search DOE PAGES for author "Dang, K."
• Search DOE PAGES for ORCID "0000-0002-9686-4270"

Taupin, V. ^[2]; McCabe, R. J.  ^[1];

• Search DOE PAGES for author "McCabe, R. J."
• Search DOE PAGES for ORCID "0000-0002-6684-7410"

Tomé, C. N.  ^[1];

• Search DOE PAGES for author "Tomé, C. N."
• Search DOE PAGES for ORCID "0000-0003-3405-0500"

Capolungo, L.  ^[1]

• Search DOE PAGES for author "Capolungo, L."
• Search DOE PAGES for ORCID "0000-0001-8079-7790"

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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Univ. de Lorraine, Metz (France)

Publication Date:

Thu Apr 28 00:00:00 EDT 2022

Research Org.:

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE Office of Science (SC). Office of Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1867178

Alternate Identifier(s):

OSTI ID: 1962176

Report Number(s):

LA-UR-22-20388
Journal ID: ISSN 2589-1529

Grant/Contract Number:  

89233218CNA000001; FWP 06SCPE401

Resource Type:

Accepted Manuscript

Journal Name:

Materialia

Additional Journal Information:

Journal Volume: 23; Journal ID: ISSN 2589-1529

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; twin transmission; grain boundaries; EBSD; phase-field model; statistics; magnesium