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Indentation size effect and strain rate sensitivity of nanocrystalline Mg-Al alloys

Diao, Hui, Yan, Cheng, Bell, John, Lu, Li, & Zhang, Guangping (2010) Indentation size effect and strain rate sensitivity of nanocrystalline Mg-Al alloys. In 5th World Congress on Engineering Asset Management (WCEAM-AGIC 2010), 25-27 October 2010, Brisbane Convention & Exhibition Centre, Brisbane. (In Press)

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Abstract

Deformation Behaviour of microcrystalline (mc) and nanocrystalline (nc) Mg-5%Al alloys produced by hot extrusion of ball-milled powders were investigated using instrumented indentation tests. The hardness values of the mc and nc metals exhibited indentation size effect (ISE), with nc alloys showing weaker ISE. The highly localized dislocation activities resulted in a small activation volume, hence enhanced strain rate sensitivity. Relative higher strain rate sensitivity and the negative Hall-Petch Relationship suggested the increasingly important role of grain boundary mediated mechanisms when the grain size decreased to nanometer region.

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ID Code: 38110
Item Type: Conference Paper
Keywords: nanocrystalline Mg alloy, strain rate sensitivity, indentation size effect, deformation mechanism
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 Please consult the authors.
Deposited On: 22 Oct 2010 14:54
Last Modified: 11 Aug 2011 04:36

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