Phase transformations «Amorphization ↔ Crystallization» in metallic materials induced by severe plastic deformation

Abstract

In this review we are considered systematically the phenomenon of deformationinduced phase transformations from crystalline intermetallic compounds and complex phases to amorphous state and vice versa phase transformations from amorphous state to crystalline one upon severe plastic deformation at different temperatures. The nature and structural features of these transitions essentially for high pressure torsion deformation are analyzed in the frame of basic principles of nonequilibrium thermodynamics. The effects of phase cycling and a stationary amorphous-nanocrystalline state formation at significant deformations is discussed in details.