In-situ scattering study of a liquid-liquid phase transition in Fe-B-Nb-Y supercooled liquids and its correlation with glass-forming ability

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

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Author(s)

  • Jiacheng Ge
  • Jing Zhou
  • Weixia Dong
  • Sinan Liu
  • Si Lan
  • Zhenduo Wu
  • Anding Wang
  • Liang Wang
  • Cun Yu
  • Baolong Shen

Detail(s)

Original languageEnglish
Pages (from-to)831-839
Journal / PublicationJournal of Alloys and Compounds
Volume787
Early online date11 Feb 2019
Publication statusPublished - 30 May 2019

Abstract

In-situ synchrotron high-energy X-ray diffraction was used to study the kinetics of structure evolution for two Fe-based bulk metallic glasses with different thermophysical behaviors upon heating and isothermal annealing in the supercooled liquid region. It is found that the structure change of (Fe0.72B0.24Nb0.04)97Y3 , an average glass former, follows a continuous disordering process before crystallization, while that of (Fe0.72B0.24Nb0.04)95.5Y4.5 , a better glass former with an anomalous exothermic peak below the crystallization temperature, is characterized by a reentrant supercooled liquid behavior. A hidden amorphous phase with a configurationally highly-correlated structure is found at a critical temperature of the anomalous exothermic peak for the (Fe0.72B 0.24Nb0.04)95.5Y4.5 supercooled liquid, and then it reenters the disordered phase of lower correlation length at a higher temperature. Synchrotron diffraction and the density measurements together illustrate that the liquid-liquid phase transition accompanies with an unusual density change upon isothermal annealing at the anomalous exothermic peak temperature. Our experimental results suggest that a liquid-liquid phase transition which occurred at the medium-range length scale plays an important role in stabilizing the (Fe0.72B0.24Nb0.04)95.5Y4.5 supercooled liquid. Possible mechanisms for the observed differences and the relationship with the glass-forming ability are discussed based on the results of the pair distribution function analysis.

Research Area(s)

  • Bulk metallic glasses, Crystallization, Glass-forming ability, Liquid-liquid phase transition, Locally favored structures

Citation Format(s)

In-situ scattering study of a liquid-liquid phase transition in Fe-B-Nb-Y supercooled liquids and its correlation with glass-forming ability. / Ge, Jiacheng; He, Haiyan; Zhou, Jing; Lu, Chenyu; Dong, Weixia; Liu, Sinan; Lan, Si; Wu, Zhenduo; Wang, Anding; Wang, Liang; Yu, Cun; Shen, Baolong; Wang, Xun-li.

In: Journal of Alloys and Compounds, Vol. 787, 30.05.2019, p. 831-839.

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