Rational design of fatigue-free phase-transforming solids
讲座名称：
Rational design of fatigue-free phase-transforming solids
讲座时间：
2018-05-21
讲座人：
陈弦
形式：
校区：
兴庆校区
实践学分：
讲座内容：
讲座题目：Rational design of fatigue-free phase-transforming solids
讲座时间：2018年5月21日（星期一），上午10:00
讲座地点：西二楼A102，曲江校区
讲座人：陈弦 博士（Dr. Xian Chen）香港科技大学 助理教授
讲座内容：Materials undergoing reversible solid-solid phase transformations provide emerging applications such as biomedical implants and stents, microelectronic actuators and sensors. The essential functionality of these materials is the ability to recover large deformation (i.e. 5~8%) before and after the structural transformation driven by temperature/stress/electromagnetic fields. It has been theorized that the macroscopic behaviors depend strongly on the kinematic conditions at atomistic scales [1]. This set of mathematical conditions underlie the material design strategy and have been proven by experiments that when the lattice parameters closely meet such conditions, the materials do not fatigue even under demanding loads up to millions of cycles [2, 3, 4]. This talk will present the idea for the design of fatigue-free phase-changing materials from three aspects: fundamental theories; rationalization of the strategy for alloy development; in situ and ex situ quantitative microstructure and micromechanics characterizations.
References:
[1] X. Chen, V. Srivastava, V. Dabade and R. D. James, J. Mech. Phys. Solids 61(2013): 2566.
[2] Y. Song, X. Chen, V. Dabade, TW. Shield and R. D. James, Nature 502(2013): 85.
[3] X. Ni, J. Greer, K. Bhattacharya, R. D. James and X. Chen, Nano Lett. 16 (12) (2016): 7621.
[4] C. Chluba, W. Ge, R. Lima de Miranda, J. Strobel, L. Kienle, E. Quandt, and M. Wuttig. Science, 348(6238):1004, 2015.
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