Hot compression deformation behavior and processing parameters of a cast Mg-Gd-Y-Zr alloy

▶ The apparent activation energy (Q) was calculated to be 209 kJ mol−1. The stress exponents (n) were measured to be 3.2 and 5.1 for the low stress region and high stress region, respectively. ▶ DRX initiated from deformation bands. ▶ Through processing-map technique, the practical processing window can be determined as 703-723 K and ε˙=0.006-0.03 s−1. ▶ Utilizing the hot processing parameters, cast ingot was directly used to manufacture the thin-walled cone with excellent shape accuracy.