An Ultrafine-Grained AZ31 Magnesium Alloy Sheet With Enhanced Superplasticity Prepared by Accumulative Roll Bonding

摘要: Abstract An ultrafine-grained AZ31 magnesium alloy sheet was produced using three-run accumulative roll bonding (ARB) performed at a rolling temperature of 350°C and reduction 80% for each pass, based on examination the bond interface influenced by ranged from 10% to 80%. The microstructural change different ARB stages observed superplasticity final examined fixed 300°C strain rates varied 10 −4 −1 s . It is shown that good AZ31/AZ31 formed as result dynamic recrystalization (DRX) accumulation original separate interface, which consistent with high reduction. Moreover, significant grain refinement achieved mainly in first run process expanding DRX reaction mass gradual uniformity size next successive occurred alloy. Besides, superplastic tension elongation 316% successfully rate −2 indicating low processed ARB. results indicate promising approach produce enhanced superplasticity.