Hidden phase transitions in metallic glasses and their applications
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| 报告题目 | Hidden phase transitions in metallic glasses and their applications |
| 报告人 | 兰司 教授 |
| 报告人单位 | 南京理工大学教授、香港城市大学（深圳研究院） |
| 报告时间 | 2018-01-29 10:30 |
| 报告地点 | 合肥微尺度物质科学国家研究中心九楼会议室（9004） |
| 主办单位 | 合肥微尺度物质科学国家研究中心 |
| 报告介绍 | 报告摘要：
Metallic glasses (MGs) constitute a new class of metastable metallic materials with unique properties, including high strength, high elastic limit, high wear and corrosion resistance, and excellent soft magnetic behavior, and promising high catalysis efficiency, for structural and functional applications. Phase transformations, including devitrification, liquid-liquid phase transition, liquid phase decompositions, in MGs, are suppressed upon quenching the molten liquids to room temperature. The hidden phase transitions thus open a window for studying the origin of the glass formation and shed lights on potential applications. In this talk, I will first briefly introduce the history of MGs and a half-century mystery about an anomalous exothermic phenomenon (AEP) which relates to a hidden liquid phase transition during heating the prototypical MGs with an AEP above glass transition temperature. The results, revealed by unitizing a suite of in-situ techniques including X-ray and neutron scattering as well as double Cs-corrected transmission electron microscopy, will be presented to solve the half-century problem. At the second part of the talk, I will present how to develop a prototypical free-standing porous metallic glasses based on the hidden phase transitions for electrocatalyst applications.
Selected Publications
1. Lan S, Ren Y, Wei X Y, Wang B, Gilbert E P, Shibayama T, Watanabe S, Ohnuma M, and Wang X -L, Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses [J]. Nature Communications, 8, 14679 (2017): 1-8. Doi: 10.1038/NCOMMS14679
2. Lan S, Blodgett M, Kelton K F, et al. Structural crossover in a supercooled metallic liquid and the link to a liquid-to-liquid phase transition [J]. Applied Physics Letters, 2016, 108(21): 211907.
3. Lan S, Wei X, Zhou J, et al. In-situ study of crystallization kinetics in ternary bulk metallic glass alloys with different glass forming abilities [J]. Applied Physics Letters, 2014, 105(20): 201906.
报告人简介：
兰司，南京理工大学教授、香港城市大学（深圳研究院）研究员。获得江苏省“双创”人才计划资助。2012年博士毕业于香港中文大学物理系材料科学与工程专业，获得杨振宁奖学金；2012年底至2016年，博士后工作于香港城市大学物理与材料科学系，后担任高级研究员岗位。2017年8月起担任戈登研讨会中子散射会议主席。科技部“大科学装置前沿研究”重点专项骨干成员、获得国家自然基金及江苏省自然科学基金资助。在Nature Communications、Advanced Materials、Small、Applied Physics Letters等SCI期刊上发表论文30余篇。2017年3月发表的自然通讯文章揭示了非晶合金中所发生的非晶多形性转变的微观结构机制，被国家基金委于首页以要闻报道，同时以中、英、日三种文字被中外各大媒体报道‘解决了金属玻璃领域逾四十年谜题’。 |
