Effect of temperature and strain rate on the deformation behavior and microstructure of a homogenized AZ31 magnesium alloy

Bajargan, Govind and Singh , Gaurav and Sivakumar, D and Ramamurty, U (2013) Effect of temperature and strain rate on the deformation behavior and microstructure of a homogenized AZ31 magnesium alloy. In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 579 . pp. 26-34.

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Abstract

The plastic deformation behavior and dynamic recrystallization (DRX) in homogenized AZ31 Mg alloy was investigated in uniaxial compression in the temperature range between 150 and 400 degrees C with strain rates ranging from 10(-3) to 10(2) s(-1). Twinning was found to contribute significantly during the early stages of deformation. The onset of twinning was examined in detail by recourse to the examination of the appearance of first local maxima before peak strain in the stress-strain responses and the second derivative of stress with strain. High strain hardening rate was observed immediately after the onset of twinning and was found to increase with the Zener-Hollomon parameter. DRX was observed at temperatures above 250 degrees C whereas deformation at lower temperatures (< 250 degrees C) leads to extensive twinning at all the strain rates. At intermediate temperatures of 250-300 degrees C, plastic strains tend to localize near grain/twin boundaries, confining DRX only to these regions. Increase in the temperature promotes non-basal slip, which, in turn, leads to uniform deformation; DRX too becomes uniform. Deformation behavior in three different regimes of temperature is discussed. The dependence of critical stress for the onset of DRX and peak flow stress on temperature and strain rate are also described. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copy right of this aerticle is belongs to ELSEVIER
Keywords:	Magnesium alloys; Twinning; Dynamic recrystallization; Grain boundary; High temperature; Dislocations
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	20 Aug 2013 11:19
Last Modified:	20 Aug 2013 11:34
URI:	http://eprints.iisc.ac.in/id/eprint/47026

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