TWINNING AND TWIN INTERSECTION IN AZ31 Mg ALLOY DURING WARM DEFORMATION

Acta Metall Sin

2009, Vol. 45

Issue (11): 1303-0308 DOI:

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TWINNING AND TWIN INTERSECTION IN AZ31 Mg ALLOY DURING WARM DEFORMATION

YANG Xuyue ZHANG Lei

1) School of Materials Science and Engineering; Central South University; Changsha 410083
2) Key Laboratory of Nonferrous Metal Materials Science and Engineering; Ministry of Education; Central South University; Changsha 410083

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YANG Xuyue ZHANG Lei. TWINNING AND TWIN INTERSECTION IN AZ31 Mg ALLOY DURING WARM DEFORMATION. Acta Metall Sin, 2009, 45(11): 1303-0308.

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Abstract

Though electron backscattering diffraction (EBSD) is widely employed for the orientation analysis of deformed microstructures in many metallic materials, its applications to Mg and its alloys are not widespread because of the difficulties involved in sample preparation. In this work, uniaxial compression tests were performed on samples cut along the extrusion direction from AZ31 Mg alloy bars, and then the twins and their intersections were analyzed by SEM/EBSD microscopy. Deformation and deformation mechanisms operating in Mg alloy depend sensitively on temperatures. Flow curve at 523 K shows a sharper and larger stress peak following slow strain hardening and rapid strain hardening. At slow hardening stage (0.02≦ε<0.06) a few of {1012} twinning was commonly observed, but at rapid hardening stage (0.06≦ε<0.22$) more twins and twin intersections appeared. There are five possible types of twin intersections, which are strongly depended on the stress direction. The two types of (1012)-(0112) and (1012)-(0112) twin intersections were observed at stress axis near to <1120> and <1010> in the samples compressed to a true strain of 0.06.

Key words: magnesium alloy warm deformation twining twin intersection orientation map

Received: 05 May 2009

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