Superplastic tensile behavior of Mg-Y-Nd alloy prepared by submerged friction stir processing (SFSP) is investigated. Microstructure of the SFSP alloy is mainly composed of fine-grained magnesium grains (%1.3 mm) and homogeneously distributed second-phase particles. Elongations are all above 500% within a wide high-temperature range of 708-758 K at 1 Â 10 À1 s À1 , and an elongation of 549% at 1 Â 10 À1 s À1 is achieved at 758 K. The excellent high-strain-rate superplasticity is attributed to the fine-grained microstructure and high thermal stability during superplastic deformation. Grain boundary sliding is the dominated deformation mechanism during superplastic deformation, and the specimens failed through cavity coalescence.
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