METALLIC MATERIAL HAVING ULTRA-FINE GRAIN STRUCTURE AND METHOD FOR ITS MANUFACTURE

摘要

A method for producing a metallic material having an ultra-fine microstructure, the metallic material exhibiting a phase transformation of a low-temperature phase into a hightemperature phase is disclosed, the method comprising the steps of: preparing a metallic material which comprises at least a low-temperature phase; applying plastic deformation to the metallic material; and increasing the temperature of the metallic material to a point beyond a transformation point while applying the plastic deformation to effect reverse transformation of the lowtemperature phase into a high-temperature phase.