To investigate the effect of LPSO orientation on the compression behavior and workability of Mg alloys, a Mg-5.3Gd-3.3Y-1.1Zn-0.5Zr (wt%) alloy was extruded to obtain the bimodal microstructure with a certain amount of directionally arranged LPSO phases. The subsequent compression tests indicate that the values of activation energy of deformation (Q) are approaching (180–194 kJ/mol) along different orientations (ED, 45°, and TD), which are much lower compared with the as-homogenized Mg-Gd-Y-Zn-Zr alloys due to the sufficient initial grain boundaries (I-GBs). Enhanced kinking and DRX at kink bands at the higher Zener-Hollomon (Z) parameters result in the slight decrease of Q and the movement of optimal processing domains for the ED orientation. The I-GBs overshadow the effect of LPSO orientation via kinking deformation on the DRX ratio and workability. The increase of Z parameter tends to reduce the DRXed grain size and the homogeneity of both the microstructure and hardness. Different α-Mg and LPSO orientations of the extruded alloy induce the anisotropy of peak flow stress (${\sigma }_p$) during compression and the extraordinary elliptical shape of the compressed TD specimens. This work provides useful information for the industrial production of wrought LPSO-containing Mg alloys.

为研究LPSO取向对镁合金压缩行为和加工性能的影响，对Mg-5.3Gd-3.3Y-1.1Zn-0.5Zr（wt%）合金进行挤压，得到一定量定向排列的双峰显微组织。 LPSO 阶段。随后的压缩测试表明，沿不同方向（ED、45°和 TD），变形活化能 ( Q ) 值接近 (180–194 kJ/mol)，与均质化 Mg 相比要低得多-Gd-Y-Zn-Zr 合金由于足够的初始晶界 (I-GBs)。在较高的 Zener-Hollomon ( Z)参数下，在扭结带处增强的扭结和 DRX导致Q略有下降以及 ED 方向的最佳加工域的移动。I-GB 通过扭结变形掩盖了 LPSO 取向对 DRX 比和可加工性的影响。Z参数的增加往往会降低DRXed晶粒尺寸以及显微组织和硬度的均匀性。挤压合金的不同 α-Mg 和 LPSO 取向导致峰值流动应力的各向异性（${\sigma }_p$) 在压缩过程中和压缩 TD 试样的非同寻常的椭圆形状。这项工作为含 LPSO 的变形镁合金的工业生产提供了有用的信息。