Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses
- Nanjing Univ. of Science and Technology, Nanjing (China); City Univ. of Hong Kong, Hong Kong (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- City Univ. of Hong Kong, Hong Kong (China)
- Australian Nuclear Science and Technology Organization (ANSTO), Kirrawee, NSW (Australia)
- Hokkaido Univ., Sapporo (Japan)
- City Univ. of Hong Kong, Hong Kong (China); City Univ. of Hong Kong Shenzhen Research Institute, Shenzhen (China)
An anomaly in differential scanning calorimetry has been reported in a number of metallic glass materials in which a broad exothermal peak was observed between the glass and crystallization temperatures. The mystery surrounding this calorimetric anomaly is epitomized by four decades long studies of Pd-Ni-P metallic glasses, arguably the best glass-forming alloys. Here we show, using a suite of in-situ experimental techniques, that Pd-Ni-P alloys have a hidden amorphous phase in the supercooled liquid region. The anomalous exothermal peak is the consequence of a polyamorphous phase transition between two supercooled liquids, involving a change in the packing of atomic clusters over medium-range length scales as large as 18 Å. With further temperature increase, the alloy reenters the supercooled liquid phase which forms the room-temperature glass phase upon quenching. Finally, the outcome of this study raises a possibility to manipulate the structure and hence the stability of metallic glasses through heat-treatment.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1372661
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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