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Engineering medium-range order and polyamorphism in a nanostructured amorphous alloy

Lan, Si; Guo, Chunyu; Zhou, Wenzhao; Ren, Yang; Almer, Jon; Pei, Chaoqun; Hahn, Horst 1; Liu, Chain-Tsuan; Feng, Tao; Wang, Xun-Li; Gleiter, Herbert 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


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 Ni$_{82}$P$_{18}$ 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.

Verlagsausgabe §
DOI: 10.5445/IR/1000118698
Veröffentlicht am 27.04.2020
DOI: 10.1038/s42005-019-0222-9
Zitationen: 22
Web of Science
Zitationen: 23
Zitationen: 22
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 2399-3650
KITopen-ID: 1000118698
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Communications Physics
Verlag Nature Research
Band 2
Heft 1
Seiten Art. Nr.: 117
Vorab online veröffentlicht am 27.09.2019
Nachgewiesen in Web of Science
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