Engineering medium-range order and polyamorphism in a nanostructured amorphous alloy
Journal Article
·
· Communications Physics
- Nanjing Univ. of Science and Technology (China); City Univ. of Hong Kong (Hong Kong)
- Nanjing Univ. of Science and Technology (China)
- City Univ. of Hong Kong, Shenzhen (China). Shenzhen Research Inst.
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Nanjing Univ. of Science and Technology (China); Karlsruhe Inst. of Technology (KIT) (Germany)
- City Univ. of Hong Kong (Hong Kong)
- City Univ. of Hong Kong (Hong Kong); City Univ. of Hong Kong, Shenzhen (China). Shenzhen Research Inst.
Like crystalline materials, the properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations. Polyamorphism is evident by the coexistence of kinetically stabilized amorphous structures with tailorable short-to-medium-range orders, providing a viable means to engineer the degree of local order and heterogeneity. Here, we report experimental evidence of the coexistence of liquid-like and solid-like amorphous phases in a Ni82P18 amorphous alloy with enhanced thermal stability and plasticity prepared by pulsed electrodeposition. The two amorphous phases, of comparable volume fraction of ~50% each, have similar short-range order but are distinguished by packing at the medium-range length scale (>6 Å). Upon heating, a structure crossover at ~450 K was observed, where the liquid-like structure transforms to the solid-like structure, as evidenced by the enthalpy release and an anomalous contraction of atomic structure over the medium-range length scale, due to the metastable nature of the liquid-like structure.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- Fundamental Research Funds for the Central Universities; German Research Foundation (DFG); National Natural Science Foundation of China (NNSFC); Natural Science Foundation of Jiangsu Province; Research Grants Council of the Hong Kong Special Administrative Region; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1774502
- Journal Information:
- Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 2; ISSN 2399-3650
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Molecular dynamics simulations of amorphous Ni–P alloy formation by rapid quenching and atomic deposition
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journal | January 2020 |
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