Extrusion Mg-Gd based alloy has the excellent mechanical properties, but usually at the sacrifice of productivity. In this paper, we designed a Mg-10Gd-1Sm-0.5Zr alloy, and have successfully extruded it with a die-exit speed of 3.2 m min⁻¹, and the extrudability is improved by indirect extrusion under differential-thermal condition. The microstructure and mechanical properties of as-extruded and peak-aged alloys were investigated in detail. The results indicate that as-extruded alloys exhibit the bimodal structure composed of dynamic recrystallized (DRXed) grains and UnDRXed grains with good ductility, and its elongation (El) is 14.3% at room temperature and 26.2% at 250 C. Aging treatment remarkably enhance the strength of as-extruded alloy, and the peak-aged alloy exhibits ultimate tensile strength (UTS) of 345 MPa, yield strength (YS) of 287 MPa and EL of 6.3% at room temperature, and has UTS of 316 MPa, YS of 268 MPa, and EL of 7.8% at 250 C. β′ precipitation strengthening, fine-grain strengthening, solution strengthening, texture strengthening have responsible for improving strength of peak-aged alloy.

挤压Mg-Gd基合金具有优良的机械性能，但通常以牺牲生产率为代价。在本文中，我们设计了一种 Mg-10Gd-1Sm-0.5Zr 合金，并以 3.2 m min ^{-1 的}出模速度成功挤出，在差热条件下通过间接挤出提高了挤出性。详细研究了挤压态和峰时效合金的显微组织和力学性能。结果表明，挤压态合金呈现动态再结晶(DRXed)晶粒和UnDRXed晶粒组成的双峰结构，具有良好的延展性，其室温伸长率(El)为14.3%，250 C时伸长率为26.2%。时效处理显着提高挤压态合金的强度，峰值时效合金的极限抗拉强度 (UTS) 为 345 MPa，屈服强度 (YS) 为 287 MPa，室温下 EL 为 6.3%，UTS 为 316 MPa，YS 268 MPa，EL 为 7.8% 在 250 C. β′ 析出强化、细晶强化、固溶强化、织构强化对提高峰时效合金的强度起到了重要作用。