Effects of Temperature and Strain Rate on Deformation Twinning in Fe–Si Alloy

Abstract

In this study, the effects of temperature and strain rate on the deformation twinning behavior in Fe–5%Si alloy were investigated. Tensile tests at various temperatures (198–248 K) and strain rates (0.1–0.01 s⁻¹) were carried out up to a strain of 0.8%. The presence of deformation twins was confirmed in all the tensiled specimens. The results of crystal orientation analysis by SEM–EBSP indicated that the {112} plane is the twinning plane for the twins formed in the grains. The area fraction and the width of deformation twin increased with decreasing temperature or with increasing strain rate. This tendency can be explained by the relationship between the resolved shear stress and the dislocation velocity.