Long-Range Mass Transport during Structural Transitions in Metallic Glass-Forming Melts

I. Jonas, F. Yang, and A. Meyer
Phys. Rev. Lett. 123, 055502 – Published 2 August 2019

Abstract

We investigate the structure and dynamics of the bulk metallic glass-forming alloys Zr41.2Ti13.8Cu12.5Ni10Be22.5 and Zr58.5Cu15.6Ni12.8Al10.3Nb2.8. Combining in situ synchrotron x-ray diffraction and quasielastic neutron scattering with electrostatic levitation, we directly observe an abrupt change in the temperature dependence of the first structure factor maximum of these melts. We find that the kinetics of this liquid-liquid transition during cooling are on the order of tens of seconds, whereas its onset temperature depends only weakly on the applied cooling rate. Such slow transition kinetics require long-range mass transport, which is incompatible with a transition mechanism involving only local structural changes as in oxides or molecular liquids.

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  • Received 16 November 2018
  • Revised 12 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.055502

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

I. Jonas, F. Yang*, and A. Meyer

  • Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany

  • *fan.yang@dlr.de

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Issue

Vol. 123, Iss. 5 — 2 August 2019

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