Dynamic Crossover in Metallic Glass Nanoparticles  

作　　者：Shan Zhang Weihua Wang Pengfei Guan 张珊;汪卫华;管鹏飞(Beijing Computational Science Research Center,Beijing 100193,China;Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Beijing Computational Science Research Center,Beijing 100193,China [2]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics Letters》2021年第1期68-72,共5页中国物理快报（英文版）

基　　金：Supported by the Science Challenge Project(Grant No.TZ2018004);the National Natural Science Foundation of China(Grant No.U1930402);S.Z.and P.G.acknowledge the computational support from the Beijing Computational Science Research Center(CSRC).

摘　　要：We report the dynamic crossover behavior in metallic glass nanoparticles(MGNs)with the size reduction based on the extensive molecular dynamics(MD)simulations combined with the activation-relaxation technique(ART).The fragile-to-strong transition of dynamics can be achieved by just modulating the characteristic size of MGNs.It can be attributed to the abnormal fast surface dynamics enhanced by the surface curvature.By determining the potential energy surface,we reveal the hierarchy-to-flat transition of potential energy landscape(PEL)in MGNs,and demonstrate the intrinsic flat potential landscape feature of the MGN with size smaller than a critical size.Our results provide an important piece of the puzzle about the size-modulated potential energy landscape and shed some lights on the unique properties of MGs in nanoscale.

关 键 词：LANDSCAPE SIZE POTENTIAL 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TB383.1[金属学及工艺—合金]