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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [2];  [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
  3. AVIC Beijing Institute of Aeronautical Materials, Beijing (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
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 Org.:
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)
OSTI Identifier:
1327616
Alternate Identifier(s):
OSTI ID: 1358722; OSTI ID: 1413750
Grant/Contract Number:  
AC05-00OR22725; FE-0008855; FE-0024054; FE-0011194; LDRD-6789; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 121; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnesium alloy; Twinning; Synchrotron X-ray; Deformation mechanism

Citation Formats

Wu, Wei, Gao, Yanfei, Li, Nan, Parish, Chad M., Liu, Wenjun, Liaw, Peter K., and An, Ke. Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.08.058.
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Wu, Wei, Gao, Yanfei, Li, Nan, Parish, Chad M., Liu, Wenjun, Liaw, Peter K., & An, Ke. Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys. United States. https://doi.org/10.1016/j.actamat.2016.08.058
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Wu, Wei, Gao, Yanfei, Li, Nan, Parish, Chad M., Liu, Wenjun, Liaw, Peter K., and An, Ke. Sun . "Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys". United States. https://doi.org/10.1016/j.actamat.2016.08.058. https://www.osti.gov/servlets/purl/1327616.
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@article{osti_1327616,
title = {Intragranular twinning, detwinning, and twinning-like lattice reorientation in magnesium alloys},
author = {Wu, Wei and Gao, Yanfei and Li, Nan and Parish, Chad M. and Liu, Wenjun and Liaw, Peter K. and An, Ke},
abstractNote = {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.},
doi = {10.1016/j.actamat.2016.08.058},
journal = {Acta Materialia},
number = ,
volume = 121,
place = {United States},
year = {Sun Sep 11 00:00:00 EDT 2016},
month = {Sun Sep 11 00:00:00 EDT 2016}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.actamat.2016.08.058
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    Works referencing / citing this record:

    Bending Behavior of a Wrought Magnesium Alloy Investigated by the In Situ Pinhole Neutron Diffraction Method
    journal, August 2018

    The effect of strain rate on the mechanisms of plastic flow and failure of an ECAE AZ31B magnesium alloy
    journal, July 2019

    • Kannan, Vignesh; Ma, Xiaolong; Krywopusk, Nicholas M.
    • Journal of Materials Science, Vol. 54, Issue 20
    • DOI: 10.1007/s10853-019-03838-5

    Study on the hot tensile behavior, microstructure and fracture of Mg-13Gd-4Y-2Zn-0.5Zr alloy
    journal, May 2018

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