Concentration dependence of interdiffusion in aluminum-rich Al-Cu melts

E. Sondermann, N. Jakse, K. Binder, A. Mielke, D. Heuskin, F. Kargl, and A. Meyer
Phys. Rev. B 99, 024204 – Published 28 January 2019
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Abstract

We present measurements and ab initio molecular dynamic simulations of interdiffusion in aluminum-rich Al-Cu melts for concentrations up to 30 at. % copper. To obtain accurate data, a combination of x-ray radiography and shear-cell technique is used, including an experiment in microgravity. Interdiffusion coefficients between 5.3 and 3.2×109m2/s at 973 K are found experimentally with a slight decrease with increasing Cu concentration. Results from ab initio molecular dynamic simulation at 1000 K show a decrease of interdiffusion coefficients with the same slope at slightly higher values. Using Darken's equation to discuss the relation between self-diffusion and interdiffusion, we find the cross-correlation term S to be around unity by simulation and experiment.

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  • Received 31 August 2018
  • Revised 25 October 2018

DOI:https://doi.org/10.1103/PhysRevB.99.024204

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalFluid Dynamics

Authors & Affiliations

E. Sondermann1,*, N. Jakse2, K. Binder1, A. Mielke1, D. Heuskin1, F. Kargl1, and A. Meyer1

  • 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany
  • 2Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMaP, F-38000 Grenoble, France

  • *elke.sondermann@dlr.de

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Issue

Vol. 99, Iss. 2 — 1 January 2019

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