Five-fold local symmetry in metallic liquids and glasses**Project supported by the National Natural Science Foundation of China (Grant Nos. 51271195 and 51271197), the National Basic Research Program of China (Grant No. 2015CB856800), the Fundamental Research Funds for the Central Universities, China, and the Research Funds of Renmin University of China (Grnat No. 16XNLQ01).

Abstract

The structure of metallic glasses has been a long-standing mystery. Owing to the disordered nature of atomic structures in metallic glasses, it is a great challenge to find a simple structural description, such as periodicity for crystals, for establishing the structure–property relationship in amorphous materials. In this paper, we briefly review the recent developments of the five-fold local symmetry in metallic liquids and glasses and the understanding of the structure–property relationship based on this parameter. Experimental evidence demonstrates that five-fold local symmetry is found to be general in metallic liquids and glasses. Comprehensive molecular dynamics simulations show that the temperature evolution of five-fold local symmetry reflects the structural evolution in glass transition in cooling process, and the structure–property relationship such as relaxation dynamics, dynamic crossover phenomena, glass transition, and mechanical deformation in metallic liquids and glasses can be well understood base on the simple and general structure parameter of five-fold local symmetry.