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Orientation dependence of the indentation impression morphology in a Mg alloy

Gollapudi, S and Azeem, MA and Tewari, A and Ramamurty, U (2011) Orientation dependence of the indentation impression morphology in a Mg alloy. In: Scripta Materialia, 64 (2). pp. 189-192.

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Official URL: http://dx.doi.org/10.1016/j.scriptamat.2010.09.041

Abstract

The formation of anomalous indentations, with two opposite faces describing a pin-cushion effect and the other two faces normal, in long elongated grains of an extruded Mg-2Al-1Zn alloy is reported. Subsurface microstructural observations combined with Schmid factor calculations suggest that extension twinning accompanied by basal slip are the reasons for these. Johnson's expanding cavity model is invoked for further substantiation. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Extrusion; Magnesium alloy; Twinning; Microindentation; Work hardening
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 21 Dec 2010 07:22
Last Modified: 21 Dec 2010 07:22
URI: http://eprints.iisc.ernet.in/id/eprint/34547

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