Journal article
Three-dimensional in situ observations of short fatigue crack growth in magnesium
- Abstract:
- Three-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917). Copyright 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Accepted manuscript, pdf, 3.9MB, Terms of use)
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- Publisher copy:
- 10.1016/j.actamat.2011.07.034
Authors
- Publisher:
- Elsevier
- Journal:
- Acta Materialia More from this journal
- Volume:
- 59
- Issue:
- 17
- Pages:
- 6761-6771
- Publication date:
- 2011-08-06
- DOI:
- ISSN:
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1359-6454
- Keywords:
- Pubs id:
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pubs:179620
- UUID:
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uuid:f0ca80f6-d307-4de8-9a75-ffbd1c46895a
- Local pid:
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pubs:179620
- Source identifiers:
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179620
- Deposit date:
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2012-12-19
- ARK identifier:
Terms of use
- Copyright holder:
- Acta Materialia Inc
- Copyright date:
- 2011
- Notes:
- Copyright 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. NOTICE: this is the author's version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia 59 (17) , pp. 6761-6771 (DOI: 10.1016/j.actamat.2011.07.034).
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