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Title: Crystal genes in a marginal glass-forming system of Ni50Zr50

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C7CP05976K· OSTI ID:1415792
 [1];  [2]; ORCiD logo [3];  [4];  [4]; ORCiD logo [5]
  1. Northwestern Polytechnical Univ., Xi'an (China). MOE Key Lab. 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); Zhejiang Univ., Hangzhou (China). Dept. of Applied Physics, College of Science
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  5. Northwestern Polytechnical Univ., Xi'an (China). MOE Key Lab. of Materials Physics and Chemistry under Extraordinary Conditions, School of Natural and Applied Sciences

Glass-forming motifs with B2 traits are found. A perfect Ni-centered B33 motif deteriorates the glass-forming ability of Ni50Zr50. The marginal glass-forming ability (GFA) of binary Ni-Zr system is an issue to be explained considering the numerous bulk metallic glasses (BMGs) found in the Cu-Zr system. Using molecular dynamics, the structures and dynamics of Ni50Zr50 metallic liquid and glass are investigated at the atomistic level. To achieve a well-relaxed glassy sample, sub-Tg annealing method is applied and the final sample is closer to the experiments than the models prepared by continuous cooling. With the state-of-the-art structural analysis tools such as cluster alignment and pair-wise alignment methods, two glass-forming motifs with some mixed traits of the metastable B2 crystalline phase and the crystalline Ni-centered B33 motif are found to be dominant in the undercooled liquid and glass samples. A new chemical order characterization on each short-range order (SRO) structure is accomplished based on the cluster alignment method. The significant amount of the crystalline motif and the few icosahedra in the glassy sample deteriorate the GFA.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
11304279; 11364007; 51271149; 51671160; AC02-07CH11358
OSTI ID:
1415792
Report Number(s):
IS-J-9517; PPCPFQ; TRN: US1800851
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 19, Issue 45; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cooling rate dependence of structural order in Ni 62 Nb 38 metallic glass journal January 2018
Development of a deep machine learning interatomic potential for metalloid-containing Pd-Si compounds journal November 2019

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