Mechanics of Heterogeneous Nanostructured Materials
报告人：Ting Zhu（朱廷） Georgia Institute of Technology
时 间：2017年6月29日 （星期四）下午2:30
地 点: 土木工程楼232
Metals and alloys can be processed to reach ultra-high strength, but usually at a drastic loss of ductility. In this talk, I will review recent advances in the mechanics study in order to overcome this strength-ductility tradeoff. Several case studies will be presented, including the gradient nano-grained metals, gradient nano-twinned metals, nanocluster-enhanced high-entropy alloys, and 3D-printed steel. By integrating experiments with atomistic/crystal plasticity simulations, we show that these systems share a unifying design principle in that the structural heterogeneities induce non-homogeneous plastic deformation, and the nanometer-scale features dictate steep strain gradients, thereby enhancing strain hardening and consequently uniform tensile ductility at high flow stresses. Our studies provide new insight into the design of the strong and ductile materials with heterogeneous nanostructures.
Ting Zhu is the professor and Woodruff Faculty Fellow in the Woodruff School of Mechanical Engineering, Georgia Institute of Technology. He holds a joint appointment in the School of Materials Science and Engineering at Georgia Tech. He received his B.S. in Engineering Mechanics in 1995 and Ph.D. in Solid Mechanics (advisor - Professor Wei Yang) in 1999 from Tsinghua University. He received his Ph.D. in Mechanical Engineering from Massachusetts Institute of Technology in 2004. He was a postdoctoral associate at Harvard University, before joining Georgia Tech in 2005. His research is focused on the nanomechanics of the advanced engineering materials and energy materials. Zhu received the Te Deng Scholarship at Tsinghua University in 1998 and was a recipient of the National Excellent Doctoral Dissertation Award, China. He received the Sia Nemat-Nasser Early Career Award from the American Society of Mechanical Engineers (ASME), the Young Investigator Medal from the Society of Engineering Science (SES), and the Yue-Kong Pao Visiting Chair Professorship in Zhejiang University.