报告人：邹宇博士  麻省理工学院 博士后

报告时间：2017年6月7日下午3点

报告地点：四号楼315教室

邹宇博士简介：

邹宇目前在麻省理工学院机械系做博士后研究，主要从事小尺度金属材料增材制造的研究。他于2015年底在瑞士苏黎世联邦理工学院材料系获得博士学位，主要研究材料在微纳米尺度下的力学性能。读博期间，他在JSPS资助下在京都大学机械系访问半年。此前，他于2010年硕士毕业于加拿大麦吉尔大学材料工程系，主要从事冷喷涂变形机理研究以及应用。之前，他于2007年本科毕业于北航材料学院，在王华明老师指导下完成毕业设计。他的研究包括小尺度材料力学性能，高熵合金，准晶体，冷喷涂成型，激光增材制造等。

他将于2018年初在加拿大多伦大大学材料系开始助理教授工作。

Dr. Yu Zou is currently working as a postdoctoral fellow with Prof. A John Hart in the Mechanosythesis Group of the Laboratory for Manufacturing & Productivity at MIT. From January 2018, he will be Assistant professor in the department of Materials science and Engineering at University of Toronto. Before his postdoc, he completed his PhD thesis with Prof. Ralph Spolenak in the Laboratory of Nanometallurgy at ETH Zurich (Switzerland) in the end of 2015. During his PhD studies, he worked as a visiting JSPS scholar with Prof. T. Kitamura in the Department of Mechanical Engineering at Kyoto University (Japan) for half a year in 2014. Before his PhD studies, he got his master’s degree from McGill University (Canada), and his bachelor degree from Beihang University (China), in Materials Science and Engineering. His research covers materials, mechanics, and manufacturing, including metal additive manufacturing (selective laser melting), cold spray process, design of alloys and composites, microstructure characterization, and nanomechanics.

报告摘要：

Mechanical characterization and additive manufacturing across length scales

Throughout history, exploration of different length scales – both large and small – have fundamentally reshaped human understanding of the physical world and catalyzed industrial growth. Now, the fast development of nanotechnology and advanced manufacturing challenges us to deeply understand material properties at small sizes and develop new manufacturing methodologies. Towards this vision, in the first part of my seminar I will explore mechanical properties of materials at the micrometer and nanometer scales. I will share insights on mechanical characterization of emerging nanostructured high-entropy alloys, in which I achieve mechanically strong (yield strength of ~10 GPa) and thermally stable (after annealing at 1100 °C for 3 days) materials. Then, I will demonstrate superior room-temperature ductility and high strength-to-density ratios (~1 MJ/kg) of typically brittle quasicrystals at small sizes.

In the second part, I will also talk about my research on “building the big from the small” based on selective laser melting – a metal additive manufacturing process. I will demonstrate a strategy for the selection of the most optimized parameters for “3D printing”. In closing, I will present my future work: 1) development of gradient porous metals for biomedical implantation; 2) discovery of low-density, high-strength, and thermally stable alloys for aerospace applications.