Continuous chemical redistribution following amorphous-to-crystalline structural ordering in a Zr-Cu-Al bulk metallic glass

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

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Author(s)

  • Si Lan
  • Xiyang Li
  • Ming Yang
  • Zhenduo Wu
  • Jie Zhou
  • Zhaoping Lu
  • Elliot Paul Gilbert
  • Dong Ma

Detail(s)

Original languageEnglish
Pages (from-to)285-293
Journal / PublicationJournal of Materials Science and Technology
Volume101
Online published6 Aug 2021
Publication statusOnline published - 6 Aug 2021

Abstract

Bulk metallic glasses (BMGs) are thermodynamically metastable. As such, crystallization occurs when a BMG is thermally annealed at a temperature above the glass transition temperature. While extensive studies have been performed on the crystallization kinetics of BMGs, most of them have focused on the amorphous-to-crystalline structural ordering, and little attention has been paid to chemical distribution and its relationship with the structural ordering during the crystallization process. In this paper, a new approach, with simultaneous differential scanning calorimetry (DSC) and small angle neutron scattering (SANS) measurements, was applied to study in situ the crystallization of a Zr45.5Cu45.5Al9 BMG upon isothermal annealing at a temperature in the supercooled liquid region. Quantitative analysis of the DSC and SANS data showed that the structural evolution during isothermal annealing could be classified into three stages: (I) incubation; (II) amorphous-to-crystalline structural ordering; (III) continuous chemical redistribution. This finding was validated by composition analysis with atom probe tomography (APT), which further identified a transition region formed by expelling Al into the matrix. The transition region, with a composition of (Cu,Al)50Zr50, served as an intermediate step facilitating the formation of a thermodynamically stable crystalline phase with a composition of (Cu,Al)10Zr7.

Research Area(s)

  • Bulk metallic glass, Continuous chemical redistribution, Crystallization, In situ, Transition region

Citation Format(s)

Continuous chemical redistribution following amorphous-to-crystalline structural ordering in a Zr-Cu-Al bulk metallic glass. / Wu, Xuelian; Lan, Si; Li, Xiyang; Yang, Ming; Wu, Zhenduo; Wei, Xiaoya; He, Haiyan; Naeem, Muhammad; Zhou, Jie; Lu, Zhaoping; Gilbert, Elliot Paul; Ma, Dong; Wang, Xun-Li.

In: Journal of Materials Science and Technology, Vol. 101, 28.02.2022, p. 285-293.

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