Journal article
The brittle-ductile transition in single-crystal iron
- Abstract:
- The fracture behaviour of single-crystal pure iron was studied by four-point bending of pre-cracked specimens at temperatures between 77 and 180 K and strain rates between 4.46 × 10-5 and 4.46 × 10-3 s-1. Fracture behaviour changes from brittle to ductile with increasing temperature. The brittle-ductile transition (BDT) temperature increases with increasing strain rate. The relation between BDT temperature and strain rate follows an Arrhenius relation, giving an activation energy for the BDT of 0.33 eV. Dislocation-dynamics simulations of the crack-tip plasticity and resultant shielding of the crack tip were performed using two different variants of the dislocation velocity/stress/temperature relation. The models predict an explicit BDT, and give a good quantitative fit to the experimental transition temperatures.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, pdf, 457.7KB, Terms of use)
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- Publisher copy:
- 10.1016/j.actamat.2008.06.025
Authors
- Publisher:
- Elsevier
- Journal:
- Acta Materialia More from this journal
- Volume:
- 56
- Issue:
- 18
- Pages:
- 5123-5129
- Publication date:
- 2008-01-01
- DOI:
- ISSN:
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1359-6454
- Language:
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English
- Keywords:
- Pubs id:
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pubs:17552
- UUID:
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uuid:ba68d73c-5514-4dc8-8d09-3c43d9a55ce5
- Local pid:
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pubs:17552
- Source identifiers:
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17552
- Deposit date:
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2012-12-19
- ARK identifier:
Terms of use
- Copyright holder:
- Acta Materialia Inc
- Copyright date:
- 2008
- Notes:
- 2008 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, [VOL 56, ISSUE 18, (October 2008)] DOI: http://dx.doi.org/10.1016/j.actamat.2008.06.025
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