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Title: Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses

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.
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [6]
  1. Nanjing Univ. of Science and Technology, Nanjing (China); City Univ. of Hong Kong, Hong Kong (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. City Univ. of Hong Kong, Hong Kong (China)
  4. Australian Nuclear Science and Technology Organization (ANSTO), Kirrawee, NSW (Australia)
  5. Hokkaido Univ., Sapporo (Japan)
  6. City Univ. of Hong Kong, Hong Kong (China); City Univ. of Hong Kong Shenzhen Research Institute, Shenzhen (China)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
36 MATERIALS SCIENCE; glasses; phase transitions and critical phenomena
OSTI Identifier: