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Hall-petch relationship and strain rate sensitivity of nanocrystalline Mg - 5wt% A1 alloy

Diao, Hui, Yan, Cheng, Bell, John M., & Lu, Li (2011) Hall-petch relationship and strain rate sensitivity of nanocrystalline Mg - 5wt% A1 alloy. In The First International Postgraduate Conference on Engineering, Designing and Developing the Built Environment for Sustainable Wellbeing, 27-29 April 2011, Queensland University of Technology, Brisbane, Qld.

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Abstract

This study investigated the grain size dependence of mechanical properties and deformation mechanisms of microcrystalline (mc) and nanocrystalline (nc: grain size below 100 nm) Mg-5wt% Al alloys. The Hall-Petch relationship was investigated by both instrumented indentation tests and compression tests. The test results from the indentation tests and compression tests match well with each other. The breakdown of Hall-Petch relationship and the elevated strain rate sensitivity (SRS) of present Mg-5wt% Al alloys when the grain size was reduced below 58nm indicated the more significant role of GB mediated mechanisms in plastic deformation process. However, the relatively smaller SRS values compared to GB sliding and coble creep process suggested the plastic deformation in the current study is still dislocation mediated mechanism dominant.

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ID Code: 42504
Item Type: Conference Paper
Keywords: Nanocrystalline Mg Alloy, Hall-Petch Relationship, Strain Rate Sensitivity, Deformation Mechanism
ISBN: 9780980582741
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Metals and Alloy Materials (091207)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 DIAO, H., YAN, C., BELL, J.M., & LU, L.
Copyright Statement: This publication contains conference proceedings. Reproduction, but not modification, is permissible without the authors‘ consent provided that the authors‘ work is referenced appropriately. No modification of the contents of this publication is allowed. The Organising Committee and Queensland University of Technology are not responsible for the statements or opinions expressed in this publication. Any statements or views expressed in the papers contained in these Proceedings are those of the author(s). Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Deposited On: 08 Jul 2011 08:18
Last Modified: 12 Aug 2011 20:12

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