Deformation structure in Alloy-type creep of Cantor alloy

Abstract

Compression creep tests were conducted in order to investigate the creep behavior of high entropy alloy Cantor at high temperatures. It was found that the creep behavior of Alloy-type was observed in low stress region and that of Metal-type was observed in high stress region. In addition, the activation energy of creep increased with increasing stress. This suggests that a kind of rate controlling diffusion atoms is changing depending on the stress. Microstructures after creep were observed using the Electron Back Scatter Diffraction method. The generation of dynamic recrystallized grains and formation of sub-boundaries were observed in high stress region. This is known as a typical deformation structure of Metal-type creep. In addition, a lot of low-angle grain boundaries were observed. These characteristic structures are similar to that observed in FCC metals in which stacking fault energy is relatively low.