This article provides a report on the effect of multiaxial deformation (MAD) on the structure, texture, mechanical characteristics, and corrosion resistance of the Mg-0.8 (wt.)% Ca alloy. MAD was carried out on the alloy in the as-cast and the annealed states in multiple passes, with a stepwise decrease in the deformation temperature from 450 to 250 °C in 50 °C steps. The cumulative true strain at the end of the process was 22.5. In the case of the as-cast alloy, this resulted in a refined microstructure characterized by an average grain size of 2.7 µm and a fraction of high-angle boundaries (HABs) of 57.6%. The corresponding values for the annealed alloy were 2.1 µm and 68.2%. The predominant mechanism of structure formation was associated with discontinuous and continuous dynamic recrystallization acting in concert. MAD was also shown to lead to the formation of a rather sharp prismatic texture in the as-cast alloy, whilst in the case of the annealed one the texture was weakened. A displacement of the basal poles {00.4} from the periphery to the center of a pole figure was observed. These changes in the microstructure and texture gave rise to a significant improvement of the mechanical characteristics of the alloy. This included an increase of the ultimate tensile strength reaching 308 MPa for annealed material and 264 MPa for the as-cast one in conjunction with a twofold increase in ductility. A further important result of the MAD processing was a reduction of the rate of electrochemical corrosion, as indicated by a significant decrease in the corrosion current density in both microstructural states of the alloy studied.

本文报告了多轴变形 (MAD) 对 Mg-0.8 (wt.)% Ca 合金的结构、织构、机械特性和耐腐蚀性能的影响。对铸态和退火状态的合金进行多道次 MAD，变形温度从 450 到 250°C 以 50°C 为步长逐步降低。过程结束时的累积真实应变为 22.5。在铸态合金的情况下，这导致了精细的微观结构，其特征是平均晶粒尺寸为 2.7 µm，高角边界 (HAB) 的比例为 57.6%。退火合金的相应值为 2.1 µm 和 68.2%。结构形成的主要机制与不连续和连续动态再结晶协同作用有关。MAD 还被证明会导致铸态合金中形成相当尖锐的棱柱状织构，而在退火合金的情况下织构被削弱。观察到基极 {00.4} 从外围到极图中心的位移。显微组织和织构的这些变化使合金的机械特性得到显着改善。这包括将退火材料的极限抗拉强度提高到 308 MPa，将铸态材料提高到 264 MPa，同时延展性提高了两倍。MAD 处理的另一个重要结果是电化学腐蚀速率的降低，正如所研究合金的两种微观结构状态下腐蚀电流密度的显着降低所表明的那样。