Atomic dynamics of metallic glass melts La50Ni15Al35 and Ce70Cu19Al11 studied by quasielastic neutron scattering

Peng Luo, Abhishek Jaiswal, Yanqin Zhai, Zhikun Cai, Nathan P. Walter, Long Zhou, Dawei Ding, Ming Liu, Rebecca Mills, Andrey Podlesynak, Georg Ehlers, Antonio Faraone, Haiyang Bai, Weihua Wang, and Y Z
Phys. Rev. B 103, 224104 – Published 23 June 2021
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Abstract

By employing quasielastic neutron scattering, we studied the atomic-scale relaxation dynamics and transport mechanism of La50Ni15Al35 and Ce70Cu19Al11 metallic glass melts in the temperature range of >200K above their liquidus temperatures. The results show that both liquids exhibit stretched exponential relaxation and Arrhenius-type temperature dependence of the effective diffusion coefficient. The La50Ni15Al35 melt exhibits an activation energy of 0.545 ± 0.008 eV and a stretching exponent ∼0.77 to 0.86 in the studied temperature range; no change of activation energy, as suggested in previous reports, associated with liquid-liquid phase transition was observed. In contrast, the Ce70Cu19Al11 melt exhibits larger diffusivity with a much smaller activation energy of 0.201±0.003eV and a smaller stretching exponent ∼0.51 to 0.60, suggestive of more heterogeneous dynamics.

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  • Received 26 January 2021
  • Revised 2 May 2021
  • Accepted 14 June 2021

DOI:https://doi.org/10.1103/PhysRevB.103.224104

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Peng Luo1, Abhishek Jaiswal1,2, Yanqin Zhai1,2, Zhikun Cai1,2, Nathan P. Walter1,2, Long Zhou1,2, Dawei Ding3,7, Ming Liu3, Rebecca Mills4, Andrey Podlesynak4, Georg Ehlers5, Antonio Faraone6, Haiyang Bai3,7, Weihua Wang3,7, and Y Z1,2,8,*

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 3Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
  • 4Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6NIST Center for Neutron Research, National Institute for Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 7Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 8Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

  • *Corresponding author: zhyang@illinois.edu

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Issue

Vol. 103, Iss. 22 — 1 June 2021

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