Aiming at the forward extrusion forming and its parameter optimization of high-strength and heat-resistant Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr alloy, the isothermal compression stress–strain behavior was investigated. The high-temperature plastic deformation constitutive equation and the microstructure evolution of the alloy were obtained. According to the results of variation of stress–strain with strain rates and processing temperatures, a thermal processing map of the alloy was constructed, to obtain a safe processing area where the material is not prone to be unstable. Based on the results of thermal processing map, the experiments were carried out with the punching speed of 2 mm/s, the temperatures of 400 °C, 425 °C and 450 °C and the extrusion ratio of 12. The results showed that the best comprehensive properties of the alloy were obtained at the extrusion temperature of 425 °C. In addition, our findings were in good agreement with the prediction of the thermal processing map.

针对高强度耐热Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr合金的正向挤压成形及其参数优化，研究了等温压缩应力-应变行为。得到了合金的高温塑性变形本构方程和组织演变。根据应力-应变随应变速率和加工温度变化的结果，绘制了合金的热处理图，以获得了一个安全的加工区域，材料不易不稳定。根据热处理图的结果，以2 mm / s的冲孔速度，400°C，425°C和450°C的温度以及12的挤出比进行实验。结果表明，在425°C的挤压温度下可获得最佳的合金综合性能。此外，我们的发现与热处理图的预测非常吻合。