报告题目：Composition and Microstructure Design of Structural Materials
报告内容简介：Strong, ductile, and irradiation tolerant structural materials are in urgent demand. Microstructure engineering and composition engineering are two fundamental strategy. In this talk, we demonstrated these strategies in two material systems: amorphous ceramics and high entropy alloys. Amorphous ceramics can exhibit ‘brittle-like’ behavior due to flow instability though they exhibit superior thermo-mechanical properties with respect to strength and hardness, creep and oxidation, and structural stability at high temperatures and under irradiation. We proposed to realize the strength-ductility-irradiation tolerance combination of amorphous ceramic composites (ACCs) through tailoring nanosized heterogeneities. We developed comprehensive understanding of heterogeneities-induced plasticity, heterogeneities-suppressed flow instability, and heterogeneities-enhanced irradiation tolerance in amorphous ceramics. Second, we build the selection principles for metal constituents. Metal elements that will be mixed with amorphous ceramics should prefer to form nanosized metal-rich clusters (or nanosized heterogeneities) in ACCs. For HEAs, we realized multiple strengthening mechanisms in one alloy, including solid solution strengthening, nano-twinning strengthening, precipitation strengthening, and heterogeneous-induced strengthening. More intriguingly, we discovered one novel deformation mode - shear transformation bands (“phase” transformation which promotes strain hardening rate), besides slips and twins.
报告人姓名：Jian Wang
报告人简介：Dr. Jian Wang is a full professor of Materials and Mechanical Engineering at the University of Nebraska-Lincoln. He received his Ph.D from Rensselaer Polytechnic Institute, Troy, NY, USA, in 2006, and worked at Los Alamos National Laboratory (LANL) as technical staff member for 9 years. His research focuses on quantitatively exploring the structure-properties relations of structural and nanostructured materials using multi-scale theory, modeling and experimental methods and techniques. He was awarded the LANL Distinguished Postdoctoral Performance Award (2009), the LDRD/Early Career Award (2011), two LDRD-ER Awards (2013), TMS MPMD Young Leader Award (2013), International Plasticity Young Research Award (2015), Journal Outstanding Reviewer Awards for Scripta Materialia (2016), Modelling and Simulation in Materials Science and Engineering (2016), and Acta Materialia (2017), and Materials Today 2018 Rising Star Award in the category of Materials Genome Innovation (2018). He served as Editorial Board of International Journal of Plasticity (2015~), Scientific Reports (2016~), and several others. He has published more than ~250 peer-reviewed papers (> 9500 citations and H-index = 58, 25 papers selected as Hottest Articles in Materials Science, and 7 papers featured as Journal cover), and delivered 100+ invited/keynote presentations.
报告人单位：University of Nebraska-Lincoln, NE, USA
报告时间：2019-07-07 09:30
报告地点：上大东区材料楼B楼526室
主办单位：bg大游官网官方平台bg大游官网官方平台
联系人：施思齐
