Effect of Heating Rate to Test Temperature on Superplastic Response in an Al-8%Mg-1%Li-0.2%Zr Alloy

The effect of heating rate to tension test temperature on superplastic response in an Al-8Mg-1Li-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 Cs to 2.4 x 101 Cs, following TMP. Heating rates greater than 10 Cs 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 Cs 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.