骆建
University of California, San Diego
地点：唐楼A313
时间：2018-11-06 14:00
A piece of ice melts at 0 C, but a nanometer-thick surface layer of the ice can melt at tens of degrees below zero. This phenomenon, known as “premelting,” was first recognized by the physicist Michael Faraday. Materials scientists have discovered that interfaces in engineered materials can exhibit more complex phase-like behaviors at high temperatures, which can affect the fabrication and properties of a broad range of metallic alloys and ceramic materials [see, e.g., an Overview in Acta Mater. 62:1 (2014)]. Specifically, recent studies of 2-D grain-boundary (GB) phases (also called “complexions”) shed light on several long-standing mysteries in materials science, including the origins and atomic-level mechanisms of solid-state activated sintering [see, e.g., Acta Mater. 130:329 (2017) for a recent example of CuO-doped TiO2, with applications in low-temperature co-fired ceramics], as well as liquid metal and GB embrittlement [Science 333: 1730 (2011); Science 358:97 (2017); Nature Comm. 9:2764 (2018)]. Since bulk phase diagrams are arguably one of the most useful tools for materials design, it is conceived that GB “phase” diagrams can be developed as a useful materials science tool [see, e.g., JACerS 95:2358 (2012); Acta Mater. 20:268 (2016); Scripta Mater. 130:165 (2017); Phys. Rev. Lett. 120: 085702 (2018); Scripta Mater. 158:11 (2019)].
Jian Luo graduated from Tsinghua University with dual Bachelor's degrees. After receiving his Ph.D. degree from M.I.T. in 2001, Luo worked in the industry for more than two years with Lucent Technologies Bell Laboratories and OFS/Fitel. In 2003, he joined the Clemson faculty, where he served as an Assistant/Associate/Full Professor of Materials Science and Engineering. In 2013, he moved to UCSD as a Professor of NanoEngineering and Professor of Materials Science and Engineering. He received a National Science Foundation CAREER award in 2005 (from the Ceramics program) and an Air Force Office of Scientific Research Young Investigator award in 2007 (from the Metallic Materials program). Professor Luo is a Vannevar Bush Faculty Fellow and a Fellow of the American Ceramic Society. He served as the Chair of the Basic Science Division of the American Ceramic Society (2012-2013), the Chair of the Thin Films and Interfaces committee of TMS (2012-2014), and the 2018 Chair of the Ceramics Gordon Conference.