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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 experiment...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6232174/ https://www.ncbi.nlm.nih.gov/pubmed/30420672 http://dx.doi.org/10.1038/s41467-018-07028-w |
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author | Arul Kumar, M. Clausen, B. Capolungo, L. McCabe, R. J. Liu, W. Tischler, J. Z. Tomé, C. N. |
author_facet | Arul Kumar, M. Clausen, B. Capolungo, L. McCabe, R. J. Liu, W. Tischler, J. Z. Tomé, C. N. |
author_sort | Arul Kumar, M. |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6232174 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-62321742018-11-14 Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy Arul Kumar, M. Clausen, B. Capolungo, L. McCabe, R. J. Liu, W. Tischler, J. Z. Tomé, C. N. Nat Commun Article 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. Nature Publishing Group UK 2018-11-12 /pmc/articles/PMC6232174/ /pubmed/30420672 http://dx.doi.org/10.1038/s41467-018-07028-w Text en © This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article 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 |
title | Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
title_full | Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
title_fullStr | Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
title_full_unstemmed | Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
title_short | Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
title_sort | deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6232174/ https://www.ncbi.nlm.nih.gov/pubmed/30420672 http://dx.doi.org/10.1038/s41467-018-07028-w |
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