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Effect of friction stir processing on the kinetics of superplastic deformation in an Al-Mg-Zr alloy

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Abstract

The effect of friction stir processing on the superplastic behavior of extruded Al-4Mg-1Zr was examined at 350 °C to 600 °C and at initial strain rates of 1×10−3 to 1 s−1. A combination of a fine grain size of 1.5 μm and high-angle grain boundaries in the friction stir-processed (FSP) alloy led to considerably enhanced superplastic ductility, much-reduced flow stress, and a shift to a higher optimum strain rate and lower optimum temperature. The as-extruded alloy exhibited the highest superplastic ductility of 1015 pct at 580 °C and an initial strain rate of 1×10−2s−1, whereas a maximum elongation of 1280 pct was obtained at 525 °C and an initial strain rate of 1×10−1s−1 for the FSP alloy. The FSP alloy exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. A possible origin for enhanced superplastic deformation kinetics in the FSP condition is proposed.

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Ma, Z.Y., Mishra, R.S., Mahoney, M.W. et al. Effect of friction stir processing on the kinetics of superplastic deformation in an Al-Mg-Zr alloy. Metall Mater Trans A 36, 1447–1458 (2005). https://doi.org/10.1007/s11661-005-0237-6

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