Research progress of ultrafine grained magnesium alloy prepared by equal channel angular pressing

Abstract

In this paper, the research status of equal channel angular pressing (ECAP) in the preparation of ultrafine grained magnesium alloy is introduced. The research results in recent ten years are summarized, including the principle and improvement method of ECAP process, plastic deformation mechanism of magnesium alloy, microstructure characteristics, texture evolution and mechanical properties of ultrafine grained magnesium alloy prepared by ECAP. It is pointed out that the influences of grain refinement and texture evolution on mechanical properties such as strength, superplasticity and anisotropy must be considered comprehensively. At the same time, the principle of grain refinement and texture modification in ECAP is also discussed; On the other hand, this paper summarizes the research progress of ECAP numerical simulation in analyzing the influence of ECAP process parameters on strain distribution uniformity, damage prediction, texture evolution and ductile fracture behavior. Finally, the development trend of ECAP process for preparing ultrafine grained magnesium alloy and its application prospect in the field of commercial manufacturing are introduced. Some urgent problems to be solved at this stage are discussed and solutions are put forward, which can provide references for in-depth research in the future.