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

By Hui Diao, Cheng Yan, John M. Bell and Li Lu

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

Topics: 091207 Metals and Alloy Materials, Nanocrystalline Mg Alloy, Hall-Petch Relationship, Strain Rate Sensitivity, Deformation Mechanism
Publisher: Queensland University of Technology
Year: 2011
OAI identifier: oai:eprints.qut.edu.au:42504

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