Role of alloying on tunability of martensitic phase transformation in multi-principal element alloys

ORAL

Abstract

Multi-principal element alloys (MPEAs) are an intriguing class of materials where structure and property relations can be controlled via chemical disorder. Employing density-functional theory, we tuned free energies between f.c.c. and h.c.p. phases using disorder in Fe-Mn-Co-Cr based MPEAs to show that free-energy difference and stacking-fault energy directly correlates with martensitic phase transformation and chemical short-range order. The prediction of possible martensitic transformation at specific Fe composition, i.e., x=40at.% in FexMn80-xCo10Cr10, offers an understanding of electronic level physics driving transformation-induced plasticity. This also establishes the relevance of theory-guided design for the next-generation alloys with superior structure-property correlation and provides unique insights for controlling phase transformation in technologically relevant alloys.

*Research at Ames Laboratory was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. Ames Laboratory is operated by Iowa State University for the U.S. DOE under Contract No. DE-AC02-07CH11358. R. A. acknowledges the support of QNRF under Project No. NPRP11S-1203-170056.

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Publication: P. Singh et al, Martensitic Transformation in FexMn80-xCo10Cr10 High-Entropy Alloy, Phys. Rev. Lett. 127, 115704 (2021).
P. Singh et al, Atomic short-range order and incipient long-range order in high-entropy alloys, Phys. Rev. B 91, 224204 (2015).

Presenters

  • Prashant Singh

    • Ames Lab

Authors

  • Prashant Singh

    • Ames Lab

  • Sezer Picak

    • Texas A&M University

  • Aayush Sharma

    • Ames Laboratory

  • YI Chumlyakov

    • Tomsk State University

  • Raymundo Arroyave

    • Texas A&M University

  • Ibrahim Karaman

    • Texas A&M University

  • Duane D Johnson

    • Ames Laboratory