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

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Title: Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses
Authors: Lan, S. Browse this author
Ren, Y. Browse this author
Wei, X. Y. Browse this author
Wang, B. Browse this author
Gilbert, E. P. Browse this author
Shibayama, T. Browse this author
Watanabe, S. Browse this author →KAKEN DB
Ohnuma, M. Browse this author
Wang, X. -L. Browse this author
Issue Date: 17-Mar-2017
Publisher: Nature Publishing Group
Journal Title: Nature Communications
Volume: 8
Start Page: 14679
Publisher DOI: 10.1038/ncomms14679
Abstract: 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 18Å. With further temperature increase, the alloy reenters the supercooled liquid phase, which forms the room-temperature glass phase on quenching. The outcome of this study raises a possibility to manipulate the structure and hence the stability of metallic glasses through heat treatment.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡辺 精一

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