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Explanation for deviations from the Hall-Petch Relation based on the creep behavior of an ultrafine-grained Mg-Li alloy with low diffusivity
- Authors
- Kim, W. J.
- Issue Date
- Sep-2009
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Severe plastic deformation (SPD); Magnesium alloys; Ductility; Ultrafine-grained microstructure
- Citation
- SCRIPTA MATERIALIA, v.61, no.6, pp.652 - 655
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 61
- Number
- 6
- Start Page
- 652
- End Page
- 655
- ISSN
- 1359-6462
- Abstract
- Deviation from the normal Hall-Petch relationship was observed in an ultrafine-grained Mg-Li alloy at low strain rates where plastic flow was governed by power-law creep. Based on the deformation analysis, the abnormal Hall-Petch relation for many metals often observed at nanograin sizes could be explained in terms of a transition from power-law breakdown to a grain-size-independent creep mechanism or a transition from a grain-size-independent to a grain-size-dependent mechanism, the condition of which depends greatly on strain rate and diffusivity. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Related Researcher
- Kim, Woo Jin
- Graduate School (Department of Materials Science and Engineering)