Effect of heating rate to test temperature on superplastic response in an A1-8%Mg-1%Li-0.2%Zr alloy
O'Mara, Duncan F.
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The effect of heating rate to tension test temperature on superplastic response in an Al-8%Mg-1%Li-0.2% Zr alloy was studied. A thermomechanical process (TMP) was used that involved warm rolling with controlled reheating between rolling passes. During the TMP, microstructural evolution was controlled by a continuous reaction (CRX). In this work, superplastic response was studied using five heating rates, ranging from 7.1X10-3 C/s to 2.4 x 10+1 C/s, following TMP. Heating rates greater than 10 C/s resulted in a discontinuous reaction (DRX) with a likely coarsening of grain size. Conversely, high ductilities and enhancement of superplasticity resulted from slower heating rates (1 deg C/s) that facilitated recovery and CRX in a microstructure already highly refined by CRX during the TMP. Heating rate studies; Aluminum-magnesium-lithium the alloys; Superplastic
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