MORPHOLOGY AND CRYSTALLOGRAPHIC CHARACTERISTICS OF DEFORMATION BANDS IN Mg ALLOY UNDER HOT DEFORMATION
YANG Xuyue 1;2; JIANG Yupei 1
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
Cite this article:
YANG Xuyue JIANG Yupei. MORPHOLOGY AND CRYSTALLOGRAPHIC CHARACTERISTICS OF DEFORMATION BANDS IN Mg ALLOY UNDER HOT DEFORMATION. Acta Metall Sin, 2010, 46(4): 451-457.
When metals and alloys are subjected to considerable plastic deformation such as cold-or warm–rolling, characteristic inhomogeneities generally appear as a form of deformation or shear bands. Recently much attention has been given to the deformation mechanism and morphology of fcc and bcc materials. It is well known that such inhomogeneities play an essential role in the process of work–hardening, recrystallization, metal fatigue and fracture. Therefore, in order to obtain the guiding principle for controlling those processes in Mg based alloys, it is indispensable to make clear the details of those inhomogeneous deformation structures in hcp materials. In this work, the inhomogeneous deformation and microscopic features of AZ31 Mg based alloy were studied under compression at temperature ranging from 250 to 400℃ and at a strain rate of 3×10−3 s−1. The analysis of experimental data shows that such inhomogeneities depend on deformation temperature and strain sensitively. At 250 ℃, the {1012} c–axis extension twins and deformation bands appear at around 45° with the compression axis in grain interior when straining to ε=0.1, the {1012} twins continue to grow until they impinge each other and finally most of the original grains are replaced by twinned grains at a strain of about ε=0.2. The boundaries between {1012} twins and their neighbors disappear during twinning. At 300 ℃, in contrast, the non–basal slips are activated, the kink bands with low misorientation angles are frequently evolved in grain interior and they are roughly perpendicular to the (0001) basal plane, further deformation leads to an increase in the number and misorientation angle of the kink bands. The initial grains are fragmented by kinking. With temperature increasing, the spacing of kink bands increase rapidly. The difference between kinking and other deformation bands was discussed in some detail.
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