Influence of strain path change on static recrystallisation behaviour of an extruded pure magnesium

Abstract

ABSTRACT The present work has examined the influence of strain path change on the deformation behaviour, texture evolution and recrystallisation process in an extruded pure magnesium. The samples were compressed at room temperature along ED, ND and ND–ED directions to the same total strain. Electron back-scattered diffraction (EBSD), hardness testing and X-ray diffraction were utilised to examine the deformed and annealed samples at different conditions. The texture evolution in the ND–ED samples showed a more significant difference than the samples monotonically deformed along ED and ND directions. As-deformed microstructures illustrate the presence of lenticular shaped twins in the ND–ED samples, while the complete flipping of original grains owing to twinning was observed in the ED and ND samples. The recrystallisation of ED deformed sample showed the fastest kinetics followed by the ND–ED and ND samples, respectively. This was rationalised based on the variation in deformation mechanisms. For all the three conditions, the formation of new grains at prior grain boundaries appeared to be the prevalent mechanism for recrystallisation. Additionally, for the ND–ED deformed samples, evidence of recrystallisation within twin was reported.