Applying the grain orientation dependence of deformation twinning to improve the deformation properties of an Fe-6.5 wt%Si alloy

摘要

The deformation behaviours of the equiaxed-grained and columnar-grained Fe-6.5 wt% Si alloy were comparatively studied and the mechanism of the enhanced deformation properties of columnar-grained alloys was discussed. A grain orientation dependence of the deformation twinning was identified in the Fe-6.5 wt% Si alloy. Twins tend to occur in grains with a tensile orientation near the < 001 > corner and a compressive orientation near the < 101 >-< 111 > line, which is closely related to the Schmid factor value of each orientation. The significant enhancement of the deformation properties of the columnar-grained Fe-6.5 wt% Si alloy was mainly ascribed to the promotion of twinning deformation by the grain orientation control. These results provide a theoretical guide for the microstructure design of brittle metals, such as Fe-6.5 wt% Si alloy. (C) 2016 Elsevier B.V. All rights reserved.