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Title: Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy

Abstract

Pervasive deformation twinning in magnesium greatly affects its strength and formability. The local stress fields associated with twinning play a key role on deformation behavior and fracture but are extremely difficult to characterize experimentally. In this study, we perform synchrotron experiments with differential-aperture X-ray microscopy to measure the 3D stress fields in the vicinity of a twin with a spatial resolution of 0.5 micrometer. The measured local stress field aids to identify the sequence of events involved with twinning. We find that the selected grain deforms elastically before twinning, and the twin formation splits the grain into two non-interacting domains. Under further straining one domain of the grain continued to deform elastically, whereas the other domain deforms plastically by prismatic slip. This heterogeneous deformation behavior may be mediated by the surrounding medium and it is likely to lead to asymmetric twin growth.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2];  [2];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Photon Source
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1483536
Alternate Identifier(s):
OSTI ID: 1502501
Report Number(s):
LA-UR-18-24916
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
89233218CNA000001; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; mechanical properties; metals and alloys

Citation Formats

Arul Kumar, M., Clausen, B., Capolungo, L., McCabe, R. J., Liu, W., Tischler, J. Z., and Tomé, C. N. Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy. United States: N. p., 2018. Web. doi:10.1038/s41467-018-07028-w.
Arul Kumar, M., Clausen, B., Capolungo, L., McCabe, R. J., Liu, W., Tischler, J. Z., & Tomé, C. N. Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy. United States. doi:10.1038/s41467-018-07028-w.
Arul Kumar, M., Clausen, B., Capolungo, L., McCabe, R. J., Liu, W., Tischler, J. Z., and Tomé, C. N. Mon . "Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy". United States. doi:10.1038/s41467-018-07028-w. https://www.osti.gov/servlets/purl/1483536.
@article{osti_1483536,
title = {Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy},
author = {Arul Kumar, M. and Clausen, B. and Capolungo, L. and McCabe, R. J. and Liu, W. and Tischler, J. Z. and Tomé, C. N.},
abstractNote = {Pervasive deformation twinning in magnesium greatly affects its strength and formability. The local stress fields associated with twinning play a key role on deformation behavior and fracture but are extremely difficult to characterize experimentally. In this study, we perform synchrotron experiments with differential-aperture X-ray microscopy to measure the 3D stress fields in the vicinity of a twin with a spatial resolution of 0.5 micrometer. The measured local stress field aids to identify the sequence of events involved with twinning. We find that the selected grain deforms elastically before twinning, and the twin formation splits the grain into two non-interacting domains. Under further straining one domain of the grain continued to deform elastically, whereas the other domain deforms plastically by prismatic slip. This heterogeneous deformation behavior may be mediated by the surrounding medium and it is likely to lead to asymmetric twin growth.},
doi = {10.1038/s41467-018-07028-w},
journal = {Nature Communications},
number = ,
volume = 9,
place = {United States},
year = {2018},
month = {11}
}

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Cited by: 7 works
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Figures / Tables:

Fig 1 Fig 1 : Orientation mapping of twin microstructure using polychromatic beam. a Schematic representation of the experimental geometry and mapping area at different height. b Orientation map of the region of interest with 1 μm step size. The selected grain with twin is highlighted. c Basal pole figure of themore » orientation map for all the voxels present in the scan. The orientation of the selected grain for strain measurement is marked in the pole figure. d–f Orientation maps of the same region of interest at different height with 2 μm step size« less

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