Mechanism of formation of shear bands upon cold deformation of a commercial Fe-3% Si alloy

Autor: I. V. Kagan, G. M. Rusakov, M. L. Lobanov, A. A. Redikul’tsev
Rok vydání: 2010
Předmět:
Zdroj: The Physics of Metals and Metallography. 109:662-669
ISSN: 1555-6190
0031-918X
Popis: 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.
Databáze: OpenAIRE
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