FCC to BCC transformation-induced plasticity based on thermodynamic phase stability in novel V 10 Cr 10 Fe 45 Co x Ni 35−x medium-entropy alloys

Y. H. Jo, W. M. Choi, D. G. Kim, A. Zargaran, Seok S Sohn, H. S. Kim, B. J. Lee, N. J. Kim, S. Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We introduce a novel transformation-induced plasticity mechanism, i.e., a martensitic transformation from fcc phase to bcc phase, in medium-entropy alloys (MEAs). A VCrFeCoNi MEA system is designed by thermodynamic calculations in consideration of phase stability between bcc and fcc phases. The resultantly formed bcc martensite favorably contributes to the transformation-induced plasticity, thereby leading to a significant enhancement in both strength and ductility as well as strain hardening. We reveal the microstructural evolutions according to the Co-Ni balance and their contributions to a mechanical response. The Co-Ni balance plays a leading role in phase stability and consequently tunes the cryogenic-temperature strength-ductility balance. The main difference from recently-reported metastable high-entropy dual-phase alloys is the formation of bcc martensite as a daughter phase, which shows significant effects on strain hardening. The hcp phase in the present MEA mostly acts as a nucleation site for the bcc martensite. Our findings demonstrate that the fcc to bcc transformation can be an attractive route to a new MEA design strategy for improving cryogenic strength-ductility.

Original languageEnglish
Article number2948
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

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Entropy
Thermodynamics
Temperature
Martensite

ASJC Scopus subject areas

  • General

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FCC to BCC transformation-induced plasticity based on thermodynamic phase stability in novel V 10 Cr 10 Fe 45 Co x Ni 35−x medium-entropy alloys . / Jo, Y. H.; Choi, W. M.; Kim, D. G.; Zargaran, A.; Sohn, Seok S; Kim, H. S.; Lee, B. J.; Kim, N. J.; Lee, S.

In: Scientific Reports, Vol. 9, No. 1, 2948, 01.12.2019.

Research output: Contribution to journalArticle

Jo, Y. H. ; Choi, W. M. ; Kim, D. G. ; Zargaran, A. ; Sohn, Seok S ; Kim, H. S. ; Lee, B. J. ; Kim, N. J. ; Lee, S. / FCC to BCC transformation-induced plasticity based on thermodynamic phase stability in novel V 10 Cr 10 Fe 45 Co x Ni 35−x medium-entropy alloys In: Scientific Reports. 2019 ; Vol. 9, No. 1.
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