2019年8月13日，悉尼大学安详海老师应邀前来课题组访问交流，安老师是金属材料领域知名的青年学者，共发表学术论文60余篇，包括Progress in Materials Science, Applied Physics Review, Nano letters, Acta Materialia, Materials Research Letters, Scripta Materialia, Applied Physics Letters等， 引用1700余次，H-index:24 (Google Scholar)。安老师报告题目为《Nanostructure engineering for improvement of fatigue properties of metallic materials》，报告结束后详细回答了在座老师及学生的问题，随后参观了国家增材制造研究院，并商讨了潜在合作方向及后续人员交流计划。

 报告摘要：

    With respect to the perspective engineering applications of nanostructured (NS) metallic materials, their cyclic deformation response is another essentially crucial concern owning to safety issues. Compared with their coarse grained references, NS materials generally exhibit enhanced high-cycle fatigue (HCF) and decreased low-cycle fatigue (LCF) properties. Our recent investigations revealed that prominent improvement of the LCF lives and HCF strengths, especially fatigue endurance limits, of NS metals and alloys, can be simultaneously achieved with decreasing their stacking fault energy (SFE). These upgraded fatigue performances with lowering the SFE in NS materials can be attributed not only to the simultaneous increase of their monotonic strength and ductility in macroscale, but also to the crucially decreased cyclic softening behavior in terms of grain coarsening and shear banding in microscale. In addition, the dominant fatigue damage micro-mechanism was also transformed inherently from extensive grain boundary (GB) migration to other local GB activities such as atom shuffling or GB sliding/rotation with the reduction of the SFE. Owing to the limitation of their intrinsic fatigue mechanisms, the fatigue endurance limits of NS alloys cannot always acquire appreciable improvement with their monotonic strengths. However, tuning the microstructures to harvest a recrystallized nanostructure can significantly enhance the fatigue strength of NS materials despite the lower tensile strength. These results is important both scientifically, for the in-depth comprehension of their deformation behavior, and technologically, for assessing their service utilities in safety-critical structural components, and also open up promising venues for materials design to possess optimal mechanical properties.