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Title: Cooling rate dependence of structural order in Ni 62 Nb 38 metallic glass

Journal Article · · Journal of Applied Physics
DOI: https://doi.org/10.1063/1.5019681 · OSTI ID:1422767
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [6]
  1. Northwestern Polytechnical Univ., Xi'an (China). MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Natural and Applied Sciences; Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. South China Univ. of Technology (SCUT), Guangzhou (China). School of Materials Science and Engineering
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); Zhejiang Univ., Hangzhou (China). Dept. of Applied Physics
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics
  6. Northwestern Polytechnical Univ., Xi'an (China). MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Natural and Applied Sciences

In this article, molecular dynamics (MD) simulations are performed to study the structure of Ni62Nb38 bulk metallic glass at the atomistic level. Structural analysis based on the cluster alignment method is carried out and a new Ni-centered distorted-icosahedra (DISICO) motif is excavated. We show that the short-range order and medium-range order in the glass are enhanced with lower cooling rate. Almost 50% of the clusters around the Ni atoms in the well-annealed Ni62Nb38 glass sample from our MD simulations can be classified as DISICO. It is revealed that the structural distortion with respect to the perfect icosahedra is driven by chemical ordering in the distorted region of the DISICO motif. The relationship between the structure, energy, and dynamics in this glass-forming alloy during the cooling and annealing processes is also established.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences & Engineering Division; National Energy Research Supercomputing Center (NERSC); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC02-07CH11358; 51671160; 51271149; 11304279; 11364007; LY18E010007
OSTI ID:
1422767
Report Number(s):
IS-J 9575; TRN: US1801658
Journal Information:
Journal of Applied Physics, Vol. 123, Issue 4; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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