skip to main content

DOE PAGESDOE PAGES

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

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:
Report Number(s):
LA-UR-18-24916
Journal ID: ISSN 2041-1723
Grant/Contract Number:
89233218CNA000001; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; mechanical properties; metals and alloys
OSTI Identifier:
1483536

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., 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.. 2018. "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}
}

Works referenced in this record:

Three-dimensional X-ray structural microscopy with submicrometre resolution
journal, February 2002
  • Larson, B. C.; Yang, Wenge; Ice, G. E.
  • Nature, Vol. 415, p. 887-890
  • DOI: 10.1038/415887a