Luo Xuan, Huang Tianlin, Wang Yuhui, Xin Yunchang, Wu Guilin
International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China.
National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, China.
Sci Rep. 2019 Apr 1;9(1):5428. doi: 10.1038/s41598-019-41987-4.
AZ31 Mg alloy was processed by accumulative roll-bonding (ARB) and hot rolling (HR), respectively, followed by annealing. Layered bimodal structures characterized by an alternative distribution of fine-grained layers and coarse-grained layers were obtained in the ARB samples, while mixed bimodal structures were achieved in the HR samples. The ARB samples have superior combinations of high strength and good elongation compared to the HR samples, indicating a clear effect of layered bimodal structures on mechanical properties of the alloy. The strength of the ARB samples is related to the grain size; while the ductility is attributed to the activity of non-basal slip and the strong backstress.
AZ31镁合金分别通过累积轧制复合（ARB）和热轧（HR）工艺进行加工，随后进行退火处理。在ARB样品中获得了以细晶层和粗晶层交替分布为特征的层状双峰结构，而在HR样品中则实现了混合双峰结构。与HR样品相比，ARB样品具有高强度和良好伸长率的优异组合，表明层状双峰结构对合金力学性能有明显影响。ARB样品的强度与晶粒尺寸有关；而延展性则归因于非基面滑移的活性和强大的背应力。
