Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	李秀艳研究员，中国科学院金属研究所
Inviter:
Title:	Schwarz crystal in metals
Language:	Chinese
Time & Venue:	2023.05.23 14:00 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.