Amorphization at twin-twin intersected region in FeCoCrNi high-entropy alloy subjected to high-pressure torsion

Using high-resolution electron microcopy, amorphization was observed in a FeCoCrNi high-entropy alloy subjected to high-pressure torsion. The amorphous phase nucleated and grew at twin-twin intersected regions, while its expansion was restricted by the intersected twin boundaries. We show direct experimental evidence that the amorphization in FeCoCrNi high-entropy alloy was driven from the defects accumulation under high pressure and shear stress. These observations provide new insight into the twin-twin intersection and deformation mechanism of high-entropy alloy. (C) 2017 Elsevier Inc. All rights reserved.