Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys

Wu, Wei; Gao, Yanfei; Li, Nan; Parish, Chad M.; Liu, Wenjun; Liaw, Peter K.; An, Ke

doi:10.1016/j.actamat.2016.08.058

Title: Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys

Journal Article · Sun Sep 11 00:00:00 EDT 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.08.058· OSTI ID:1327616

Wu, Wei ^[1]; Gao, Yanfei ^[2]; Li, Nan ^[3]; Parish, Chad M. ^[4]; Liu, Wenjun ^[5]; Liaw, Peter K. ^[2]; An, Ke ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
AVIC Beijing Institute of Aeronautical Materials, Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Deformation twinning plays a critical role on improving metals or alloys ductility, especially for hexagonal close-packed materials with low symmetry crystal structure. A rolled Mg alloy was selected as a model system to investigate the extension twinning behaviors and characteristics of parent-twin interactions by nondestructive in situ 3D synchrotron X-ray microbeam diffraction. Besides twinning-detwinning process, the "twinning-like" lattice reorientation process was captured within an individual grain inside a bulk material during the strain reversal. The distributions of parent, twin, and reorientated grains and sub-micron level strain variation across the twin boundary are revealed. A theoretical calculation of the lattice strain confirms that the internal strain distribution in parent and twinned grains correlates with the experimental setup, grain orientation of parent, twin, and surrounding grains, as well as the strain path changes. The study suggests a novel deformation mechanism within the hexagonal close-packed structure that cannot be determined from surface-based characterization methods. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; FE-0008855; FE-0024054; FE-0011194; LDRD-6789; AC02-06CH11357

OSTI ID:: 1327616

Alternate ID(s):: OSTI ID: 1358722; OSTI ID: 1413750

Journal Information:: Acta Materialia, Vol. 121; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Title: Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys

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