报告题目(中文)：超高循环稳定性的马氏体相变功能材料

报告题目(英文)：Beyond Fatigue: Million-Cycle Reversibility in Martensitic Phase Transformations

报告内容简介：Functional materials capable of stress-induced martensitic phase transformations are central to technologies spanning biomedical devices, microelectronics, and energy systems. A key requirement for their long-term reliability is the ability to undergo fully reversible transformations under repeated mechanical cycling. In this talk, I will present recent breakthroughs in understanding the fatigue behavior of such materials via micropillar tensile tests. Specifically, I will highlight the discovery that an alloy system with satisfaction of Cofactor Conditions can endure over 10 million transformation cycles with minimal energy dissipation and no structural degradation. This unprecedented reversibility is governed by crystallographic compatibility conditions that suppress defect accumulation and propagation during stress-induced martensitic transformations. These findings open new avenues for the design of ultra-durable functional devices in small scales.

Reference:

1. M. Karami, Z. Zhu, K. H. Chan, P. Hua, N. Tamura, X. Chen, Non-dissipative martensitic phase transformation after multi-million superelastic cycles. Phys. Rev. Lett. 132, 066101 (2024).

2. X. Ni, J. Greer, K. Bhattacharya, R. D. James and X. Chen*, Exceptional resilience of small- scale AuCuZn under cyclic stress-induced phase transformation. Nano Letters 16 (12) (2016): 7621-7625.

3. Y. Song, X. Chen (equally contributed), V. Dabade, TW. Shield and R. D. James, Enhanced reversibility and un- usual microstructure of a phase-transforming material, Nature, 502(2013), 85.

4. X. Chen, V. Srivastava, V. Dabade and R. D. James, Study of Cofactor Conditions: conditions of supercompatibility between phases, J. Mech. Phys. Solids, 61(2013), 2566.

报告人姓名：陈弦（Sherry Chen）

报告人简介(中文)：陈弦（Sherry CHEN）现任香港科技大学机械及航空航天工程系副教授，研究方向聚焦晶体学、材料力学与相变材料，其团队开发的超弹性合金材料在国际期刊《自然》等发表多项突破性成果。

报告人简介(英文)：Prof. Chen received her B.S. in Materials Science and Engineering from Huazhong University of Science and Technology, China, and her Ph.D. in Solid Mechanics from the University of Minnesota, United States. Prior to joining HKUST, she was an ALS Fellow at Lawrence Berkeley National Laboratory and a visiting faculty member in Mechanical and Civil Engineering at the California Institute of Technology. Prof. Chen is a recipient of the Early Career Award from the Hong Kong RGC and the Simons Fellowship from the Isaac Newton Institute, University of Cambridge. She currently serves as an Associate Editor of the ASME Journal of Applied Mechanics and has organized multiple international workshops and scientific programs. Her research focuses on the mechanics theories and design principles of phase-transforming functional materials, combining continuum mechanics, advanced in-situ characterization, and AI-driven algorithms to uncover microstructure–property relationships and guide the development of materials with superior reversibility and fatigue resistance. Her group’s work has advanced fundamental understanding of martensitic transformations and ferroelectric phase transitions, enabling new applications in medical devices, solid-state cooling, and energy conversion. Prof. Chen has published extensively in top-tier journals, including Nature, PRL, JMPS, Nat. Comm. and npj Comput. Mater. Nano Letters etc. She has been awarded over HKD 10 million in competitive research funding including multiple RGC General Research Fund projects, an Innovation and Technology Fund project, and collaborative research grants, establishing her as a leading researcher in the field of functional materials mechanics.

报告人单位(中文)：香港科技大学

报告时间：2025-11-17 09:00

报告地点：宝山东区16号楼520

主办单位：上海大学

联系人：刘剑