In-situ observation of an unusual phase transformation pathway with Guinier-Preston zone-like precipitates in Zr-based bulk metallic glasses

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

View graph of relations

Author(s)

  • Weixia Dong
  • Jiacheng Ge
  • Yubin Ke
  • Huiqiang Ying
  • Li Zhu
  • Sinan Liu
  • Si Lan
  • Jon Almer
  • Yang Ren

Detail(s)

Original languageEnglish
Article number153049
Journal / PublicationJournal of Alloys and Compounds
Volume819
Online published16 Nov 2019
Publication statusPublished - 5 Apr 2020

Abstract

The pathway of amorphous-to-crystalline phase transformation in Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses was studied using a suite of in-situ techniques. Multi-scale structure evidence reveals a five-stage pathway, analogous to the non-equilibrium transformation process with Guinier-Preston zones during aging in precipitation-hardened alloys, by the following sequence upon isothermal annealing the alloy in the supercooled liquid region: polyamorphous phase transition, chemical phase separation, the formation of a poorly-ordered metastable phase, and the formation of a final crystalline product. The changeable incubation periods at different annealing temperatures, and the abrupt multi-scale structure changes, as well as a latent heat release in the calorimetric measurements, support the first-order nature of the phase transformation at early stages. The structure evolution in real-space indicates that the enhancement of cluster connectivity on the medium-range scale plays essential roles in the early stages of the phase transformation, while the interface-limited ordering dominates the later stages. The experimental results suggest the phase transformation pathway with “Guinier-Preston zone-like” precipitates accompanied by the kinematic development of core-shell structures of diffuse interfaces with order parameters gradients, enabling the step-by-step decrease of free energy of the alloy system during phase transformation, which might be a characteristic behavior for multicomponent Zr-based alloys with excellent glass-forming ability.

Research Area(s)

  • Bulk metallic glasses, Electron microscopy, Guinier-Preston zone, Neutron scattering, Phase transformations pathway, Synchrotron

Citation Format(s)

In-situ observation of an unusual phase transformation pathway with Guinier-Preston zone-like precipitates in Zr-based bulk metallic glasses. / Dong, Weixia; Ge, Jiacheng; Ke, Yubin; Ying, Huiqiang; Zhu, Li; He, Haiyan; Liu, Sinan; Lu, Chenyu; Lan, Si; Almer, Jon; Ren, Yang; Wang, Xun-Li.

In: Journal of Alloys and Compounds, Vol. 819, 153049, 05.04.2020.

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