Mechanism of formation of shear bands upon cold deformation of a commercial Fe-3%Si alloy
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- 作者：G. M. Rusakov (1)
A. A. Redikul鈥檛sev (2)
I. V. Kagan (2)
M. L. Lobanov (2) - 关键词：Key words anisotropic electrical ; sheet steel ; cold deformation ; shear bands ; twinning ; special misorientations
- 刊名：The Physics of Metals and Metallography
- 出版时间：June 2010
- 出版年：2010
- 期刊代码：pc391_0031-918x
- 类别：ch
- 卷：109
- 期：6
- 页码：662-669
- 数据来源：sp
摘要
A model of the formation of shear bands upon cold deformation of {111}〈112〉 crystals of a commercial Fe-3%Si alloy is proposed. The model suggests a two-stage mechanism for the formation of a shear band and its fine structure. At the first stage, there occurs an anomalous twinning in the {114}〈221〉 system; at the second stage, an almost complete secondary twinning of the band in two standard {112}〈111〉 systems occurs. As a result of these transformations, the shear band consists of regions with an almost cube-on-edge orientation {11 11 1}〈1 1 22〉 and an “octahedral” {111}〈112〉 orientation, which is symmetrical with respect to the initial {111}〈112〉 orientation. A crystallographic mechanism responsible for an anomalous twinning in the {114}〈221〉 system by the slip of (8a/18)〈221〉 partial dislocations is proposed. It is supposed that the shear bands observed consist of groups of different numbers of shear microbands.