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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Si Lan
  • Chunyu Guo
  • Wenzhao Zhou
  • Yang Ren
  • Jon Almer
  • Chaoqun Pei
  • Horst Hahn
  • Tao Feng
  • Herbert Gleiter

Detail(s)

Original languageEnglish
Article number117
Journal / PublicationCOMMUNICATIONS PHYSICS
Volume2
Online published27 Sep 2019
Publication statusPublished - 2019

Abstract

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 similar to 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 similar to 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 Area(s)

  • NEGATIVE THERMAL-EXPANSION, NEUTRON-SCATTERING, PHASE-TRANSITION, HOMOGENEOUS FLOW, METALLIC-GLASS, LIQUID, ELECTRODEPOSITION, TRANSFORMATIONS, CRYSTALLIZATION, PHOSPHORUS

Citation Format(s)

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; Liu, Chain-Tsuan; Feng, Tao; Wang, Xun-Li; Gleiter, Herbert.

In: COMMUNICATIONS PHYSICS, Vol. 2, 117, 2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review