Abstract
The effects of heating rate prior to tension on the microstructure and superplastic behavior of friction stir processed (FSP) 7075Al alloy, with an initial grain size of 6.2 μm, were investigated. Under both slow and fast heating rates, the FSP specimens exhibited excellent grain stability without abnormal growth at elevated temperatures up to 535 °C. At temperatures lower than 500 °C, both specimens exhibited similar microstructure and superplastic behavior. At 535 °C, specimens heated via slow heating rate exhibited worse superplasticity compared with those heated by fast heating rate, because of significantly coarsened second-phase particles after high temperature exposure for a long time, which blocked grain boundary sliding during superplastic deformation and resulted in a premature fracture of specimens. It was identified that fast heating rate can prevent the particle coarsening and thus the grain growth during heating process effectively, thereby favoring obtaining an excellent superplasticity at elevated temperatures.
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