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Concomitant Clustering and Ordering Leading to B2 + BCC Microstructures in Refractory High Entropy Alloys

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Abstract

The presence of substantial concentrations of multiple principal elements in high entropy alloys or complex concentrated alloys, inevitably results in competing for clustering (or phase separation) and ordering tendencies between the constituent elemental pairs. Such competition in turn can result in interesting phase transformation pathways involving spinodal decomposition coupled with chemical ordering. Recently, a microstructure resembling that of Ni-base superalloys, with discrete BCC precipitates in a B2 matrix, in a checkered fashion, has been reported in multiple refractory high entropy alloys. This paper examines the microstructural evolution and the phase transformation pathways involved in two such candidate alloys, Al0.5NbTa0.8Ti1.5V0.2Zr and Al0.5Mo0.5NbTa0.5TiZr. The formation of this checkered pattern B2 + BCC microstructure is rationalized using schematic free energy curves and phase modulus criteria. Further, the effect of such phase distribution on mechanical properties is investigated via room-temperature compression.

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Acknowledgements

The work was supported by the US Air Force Office of Scientific Research grant FA9550-17-1-0395. The authors acknowledge the materials research facility (MRF) at the University of North Texas. YW would like to acknowledge the financial support from the air force office of scientific research (AFOSR) under Grant No. FA9550-20-1-0015.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76207, USA

    S. Dasari, V. Soni, A. Sharma & R. Banerjee

  2. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, OH, 45433, USA

    O. N. Senkov & D. B. Miracle

  3. Center for the Accelerated Maturation of Materials, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43212, USA

    H. L. Fraser & Y. Wang

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  1. S. Dasari
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  2. V. Soni
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Dasari, S., Soni, V., Sharma, A. et al. Concomitant Clustering and Ordering Leading to B2 + BCC Microstructures in Refractory High Entropy Alloys. Trans Indian Inst Met 75, 907–916 (2022). https://doi.org/10.1007/s12666-021-02518-w

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