Microstructure and texture evolution of Pure magnesium during ecae

Abstract

Initially hot rolled commercially pure magnesium and having a basal texture was deformed by Equal Channel Angular Extrusion (ECAE). ECAE was carried out up to 4 passes in a 90° die following three different routes (A, Bc and C) at a temperatures of 523 K. Systematic analysis of microstructures, grain size distributions, texture and grain boundary character distributions was carried out using electron back scattered diffraction in field emission gun scanning electron microscope in the transverse plane. In addition to significant reduction in grain size, strong <0002> fiber texture inclined at an angle ~ 45o from the extrusion axis formed in the material. Texture was also analyzed by orientation distribution function (ODF) and compared vis-à-vis shear texture. A significant amount of dynamic recrystallization occurred during ECAE, which apparently did not influence the deformation texture.