Beating the Miscibility Barrier between Iron Group Elements and Magnesium by High-Pressure Alloying

N. Dubrovinskaia, L. Dubrovinsky, I. Kantor, W. A. Crichton, V. Dmitriev, V. Prakapenka, G. Shen, L. Vitos, R. Ahuja, B. Johansson, and I. A. Abrikosov
Phys. Rev. Lett. 95, 245502 – Published 8 December 2005

Abstract

Iron and magnesium are almost immiscible at ambient pressure. The low solubility of Mg in Fe is due to a very large size mismatch between the alloy components. However, the compressibility of Mg is much higher than that of Fe, and therefore the difference in atomic sizes between elements decreases dramatically with pressure. Based on the predictions of ab initio calculations, we demonstrate in a series of experiments in a multianvil apparatus and in electrically and laser-heated diamond anvil cells that high pressure promotes solubility of magnesium in iron. At the megabar pressure range, more than 10 at. % of Mg can dissolve in Fe and then the alloy can be quenched to ambient conditions. A generality of the concept of high-pressure alloying between immiscible elements is demonstrated by its application to two other Fe group elements, Co and Ni.

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  • Received 21 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.245502

©2005 American Physical Society

Authors & Affiliations

N. Dubrovinskaia1,8, L. Dubrovinsky1, I. Kantor1, W. A. Crichton5, V. Dmitriev6, V. Prakapenka7, G. Shen7, L. Vitos4,3, R. Ahuja3, B. Johansson4,3, and I. A. Abrikosov2

  • 1Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
  • 2Department of Physics and Measurement Technology, Linköpings University, Sweden
  • 3Condensed Matter Theory Group, Department of Physics, Uppsala University, S-751 21 Uppsala, Sweden
  • 4Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, Brinellvägen 23, SE-100 44 Stockholm, Sweden
  • 5European Synchrotron Radiation Facility, Grenoble 38043, France
  • 6Swiss-Norwegian Beam Lines at ESRF, F-38043 Grenoble, France
  • 7Consortium for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
  • 8Lehrstuhl für Kristallographie, Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany

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Vol. 95, Iss. 24 — 9 December 2005

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