報告題目：Interfacial complexions within polycrystalline metals and ceramics and their roles in tailoring microstructures

報告人：喻志陽 研究員，福州大學化學學院  能源與光催化國家重點實驗室

報告時間：2021年12月8日（周三）10:00

報告地點：逸夫技術科學樓A205

摘要：

Interfaces, such as surface, heterophase boundary, and grain boundary, can be treated as thermodynamically stable states, with their structure, chemistry, and property greatly deviating from the abutting bulk phases. In order to differentiate them from bulk phases, interfacial states exhibiting phase-like behaviors are termed “complexion”. Aberration-corrected transmission electron microscopy greatly motivated the development of interfacial complexions, the transition of which are closely related to crystal growth, grain growth, sintering, and grain boundary embrittlement phenomena. Here, I will present our recent efforts in uncovering the unprecedentedly atomistic details of interfacial complexions within a variety of commonly used material systems by advanced electron microscopy, including general grain boundaries of metals (Ni, Al) and ceramics (WC, SiC, B4C, etc.) as well as their phase boundaries (WC-Co). Complexion diagrams are created as a powerful tool to guide the rational microstructure design of nanostructures and polycrystalline materials.

報告人簡介：

喻志陽，福州大學化學學院和能源與光催化國家重點實驗室研究員。2011年博士畢業于清華大學，導師朱靜院士；2011-2015年在美國裡海大學從事博士後研究；2016-2017任廈門理工學院講師，副教授；2018年受聘福州大學閩江特聘教授。主要研究方向為使用球差校正電鏡技術探讨材料、化學和物理等交叉學科中的表界面科學問題，在Science，Nature Catalysis，Science Advances，Material Horizons等知名期刊發表論文60餘篇。共主持國家自然科學基金面上和青年項目2項，福建省雛鷹計劃青年拔尖人才項目1項，福建省自然科學基金等省部級項目2項等。