A high-performance Mg-4.9Gd-3.2Y-1.1Zn-0.5 Zr alloy has been fabricated by multidirectional forging (MDF) after analyzing its compression behavior. The as-homogenized alloy exhibits a high activation energy Q of deformation (∼285 kJ/mol). The size of DRXed grains after compression tends to decrease as the Z-H parameter (Z) increases, showing a grain size exponent m of ∼4.0. Lamellar LPSO phases, kinking deformation, and bimodal microstructure are detected at the relatively low compression temperature of 350 and 400 °C, while sufficient DRX can be achieved at 500 °C, accompanied by the dissolution of lamellar LPSO. According to the processing maps, MDF was successfully conducted under an appropriate condition. After peak-aged at 200 °C for 78 h, the MDFed billet exhibits a tensile yield strength (TYS) of 331 and 305 MPa at room temperature and 200 °C, respectively. The high strength mainly results from the combination of fine grains, low Schmid factor for basal slip, sufficient ${\beta }^{\text{'}}$ ageing precipitates, and directionally arranged interdendritic LPSO phases, etc. This paper provides a feasible way for the fabrication of high-performance, low-RE-content, and large-scale Mg components for industrial production.

通过分析其压缩行为，通过多方向锻造（MDF）制备了高性能Mg-4.9Gd-3.2Y-1.1Zn-0.5 Zr合金。均质合金表现出高的变形活化能Q（〜285 kJ / mol）。随着ZH参数（Z）的增加，压缩后的DRXd晶粒尺寸趋于减小，显示出晶粒尺寸指数m约4.0。在相对较低的350和400°C压缩温度下，可检测到层状LPSO相，扭结变形和双峰微观结构，而在500°C时可获得足够的DRX，并伴随着层状LPSO的溶解。根据处理图，在适当的条件下成功进行了MDF。在200°C时效达到峰值78 h后，MDF坯料在室温和200°C下分别显示出331和305 MPa的拉伸屈服强度（TYS）。高强度主要归因于细晶粒的结合，低的施密德因子（Schmid），基滑${\beta }^{\text{'}}$ 老化的析出物和定向排列的枝晶间LPSO相等。本文为工业化生产高性能，低稀土含量的大规模镁组分提供了可行的方法。