Abstract
Friction stir processing (FSP) was used to achieve grain refinement on Mg-Al-Zn alloys, which also brought in significant texture modification. The different micro-texture characteristics were found to cause irregular micro-hardness distribution in FSPed region. The effects of texture and grain size were investigated by comparative analyses with strongly textured rolling sheet. Grain refinement improved both strength and elongation in condition of a basal texture while such led to an increment in yield stress and a drop in elongation and ultimate stress when the basal texture was modified by FSP.
Highlights
Magnesium (Mg) alloys gained increasing interest for aerospace and automotive industries in the past few decades due to their prominent performance in weight saving
All these results invariably showed that the hardness was higher in FSPed region than in BM, which might be attributed to the grain refinement effect caused by DRX
The grain size did not show much variation within the processed region, the observed irregular hardness distribution in friction-stir processing (FSP) region was attributed to local micro-texture effect based on EBSD results
Summary
Magnesium (Mg) alloys gained increasing interest for aerospace and automotive industries in the past few decades due to their prominent performance in weight saving. Due to the limited number of available slip systems in the hexagonal closed-packed (HCP) structure, Mg alloys show poor formability especially at lower temperature[1]. This was widely believed to be one of the most important factors to restrict their wider application in industry. The influence of SPD on the mechanical properties of Mg alloys has been frequently reported, including equal-channel angular pressing (ECAP)[15,16], friction-stir processing (FSP)[17,18], high-pressure torsion (HPT)[19,20], accumulative rolling (AR)[21,22], etc. The micro-texture related micro-hardness distribution in FSPed region was thoroughly studied
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