Superplasticity of a friction stir processed overaged WE54 magnesium alloy

The coarse-grained WE54 magnesium alloy was heat treated in order to have minimum hardness minimizing the effects of precipitates and solid solution. Friction stir processing (FSP) applied severe conditions obtain fine, equiaxed highly misoriented grains, with grain sizes even less than 1 µm. high severity demonstrated a strong impact microstructure. Consequently, processed materials exhibited excellent superplasticity at strain rate 10−2 s−1, temperatures between 300 400 °C. maximum tensile superplastic elongation 756% achieved °C thanks operation boundary sliding mechanism (GBS). Besides new data obtained through testing, paper deals transcendental question regarding large differences values given stress regime compared other magnesium-based alloys. With this is mind, 19 alloys from 22 different investigations were analyzed give some light behavior that never before. It proposed has be attributed accommodation process, necessary for GBS occur, which hindered by reinforcing solutes.