In the present investigation, annealing treatment at a temperature of 623 K for 5 min has been carried out on Mg-4Zn-0.5Ca-0.16Mn (wt%) alloy specimens forged at various temperatures viz., 523 K, 573 K, and 623 K. Furthermore, the specimen forged at 573 K was isothermally annealed at 623 K for different durations up to 120 min. Significant basal texture weakening along with typical heterogeneous distribution of grain size, is observed due to static recrystallization in the specimens forged at 523 and 573 K and each annealed at 623 K for 5 min, as compared to their forged counterparts. A better combination of tensile properties is achieved in the specimen forged at 573 K and subsequently annealed at 623 K for 5 min, than the other two identically annealed specimens, owing to the synergistic contributions of the typical grain size heterogeneity, smaller average grain size, higher basal texture intensity, and simultaneous existence of finer and coarser second phase particles. During the isothermal annealing treatment, the grain growth exponent is observed to be high (n ~ 9) due to the presence of the higher percentage of particles and PSN-assisted DRX grains in the forged specimen. The yield strength value decreases with the annealing duration predominantly due to grain size coarsening, whereas the ductility and work hardening behavior improve gradually under the combined influence of increasing grain size as well as its heterogeneity.

在本研究中，已经在523 K，573 K和523 K的各种温度下锻造的Mg-4Zn-0.5Ca-0.16Mn（wt％）合金试样上，在623 K的温度下进行了5分钟的退火处理。 623K。此外，将在573 K锻造的试样在623 K等温退火长达120分钟。与在锻造时相比，由于在523和573 K锻造并在623 K退火5分钟的试样中进行了静态再结晶，观察到了明显的基础纹理减弱以及典型的晶粒尺寸不均匀分布。由于其他典型的晶粒尺寸异质性的协同作用，与其他两个相同的退火试样相比，在573 K锻造并随后在623 K退火5分钟的试样中获得了更好的拉伸性能组合，较小的平均晶粒尺寸，较高的基础纹理强度，以及同时存在较细和较粗的第二相颗粒。在等温退火处理期间，由于锻造样品中存在较高百分比的颗粒和PSN辅助DRX晶粒，因此观察到晶粒生长指数较高（n〜9）。屈服强度值主要是由于晶粒粗化而随退火时间的延长而降低，而在晶粒尺寸增大及其异质性的综合影响下，塑性和加工硬化行为逐渐提高。由于锻造样品中存在较高百分比的颗粒和PSN辅助DRX晶粒，因此观察到晶粒生长指数很高（n〜9）。屈服强度值主要是由于晶粒粗化而随退火时间的延长而降低，而在晶粒尺寸增大及其异质性的综合影响下，塑性和加工硬化行为逐渐提高。由于锻造样品中存在较高百分比的颗粒和PSN辅助DRX晶粒，因此观察到晶粒生长指数很高（n〜9）。屈服强度值主要是由于晶粒粗化而随退火时间的延长而降低，而在晶粒尺寸增大及其异质性的综合影响下，塑性和加工硬化行为逐渐提高。