Speaker

　　Title

　　Time

　　Venue

N204

　　Abstract

　　Metals usually exist in form of polycrystalline solids, in which the networks of disordered grain boundaries tend to get eliminated through grain coarsening upon heating or straining, or to transform into metastable amorphous states when the grains are small enough. Through experiments and molecular dynamic simulations, we recently discovered a novel metastable structure in metals with grains of few nanometers in size, namely Schwarz crystal structure. The GB-network of the metal is characterized by 3D minimal interfaces structure with a zero-mean-curvature constrained by twin boundaries. The unique structure is thermally stable against grain coarsening at temperatures close to the equilibrium melting point and exhibits a hardness in vicinity of the theoretical value.

　　Affiliation

　　女，1979年5月生，中共党员，沈阳材料科学国家研究中心副主任，中国科学院金属研究所研究员，军委科技委基础领域专家委员会委员，国家杰出青年科学基金获得者。近年来在纳米金属研究方面取得系列原创成果：发现纳米晶晶界自发弛豫现象；发现Schwarz crystal受限晶体结构等；提出材料素化概念及原理，被列入科技部、军科委等规划。发表5篇Science论文在内的文章90余篇。