Evaluation of Recovery Process of Pure Magnesium at Room Temperature By Acoustic Emission

Abstract

Present study was conducted in order to expand the applications of acoustic emission (AE) as a tool in evaluation of the recovery behavior of pure magnesium after deformation at room temperature. From our previous research, we confirmed that AE from magnesium and its alloys during recovery process at room temperature is a unique characteristic and AE measurement should also be a promising approach in investigating such characteristic phenomenon. In present research, magnesium with purity of 99.95% was selected as the main research objective, and the cylinder specimen was compressed with strain rate of 1.67×10-4/s and unloaded with extremely high strain rate of 0.56/s for the forthcoming AE evaluation in anelastic recovery process. The AE behavior during anelastic recovery process and parameters such as anelastic recovery strain and twin densities etc. were analyzed in detail. Pseudoelastic behavior of pure magnesium was considered to be related to the detwinning and dislocation motions by the driving force of internal stress.