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Predicting the Crystal Structure and Phase Transitions in High-Entropy Alloys

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Abstract

High-entropy alloys (HEAs) have advantageous properties compared with other systems as a result of their chemistry and crystal structure. The transition between a face-centered cubic (FCC) and body-centered cubic (BCC) structure in the Al x CoCrFeNi high-entropy alloy system has been investigated on the atomic scale in this work. The Al x CoCrFeNi system, as well as being a useful system itself, can also be considered a model HEA material. Ordering in the FCC structure was investigated, and an order–disorder transition was predicted at ~600 K. It was found that, at low temperatures, an ordered lattice is favored over a truly random lattice. The fully disordered BCC structure was found to be unstable. When partial ordering was imposed (lowering the symmetry), with Al and Ni limited specific sites of the BCC system, the BCC packing was stabilized. Decomposition of the ordered BCC single phase into a dual phase (Al-Ni rich and Fe-Cr rich) is also considered.

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Acknowledgement

This research was undertaken with the assistance of resources provided at the NCI National Facility systems at the Australian National University through the National Computational Merit Allocation Scheme supported by the Australian Government. This work was supported by the Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE) (https://www.massive.org.au).

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Authors and Affiliations

  1. Department of Nanomaterials, University of Technology Sydney, Sydney, NSW, Australia

    D. M. King & M. Cortie

  2. Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232, Australia

    D. M. King, S. C. Middleburgh, L. Edwards & G. R. Lumpkin

  3. Westinghouse Electric AB, Västerås, Sweden

    S. C. Middleburgh

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  1. D. M. King
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  2. S. C. Middleburgh
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  4. G. R. Lumpkin
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  5. M. Cortie
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Correspondence to S. C. Middleburgh.

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King, D.M., Middleburgh, S.C., Edwards, L. et al. Predicting the Crystal Structure and Phase Transitions in High-Entropy Alloys. JOM 67, 2375–2380 (2015). https://doi.org/10.1007/s11837-015-1495-4

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  • DOI: https://doi.org/10.1007/s11837-015-1495-4

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