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FCC to BCC transformation-induced plasticity based on thermodynamic phase stability in novel V10Cr10Fe45CoxNi35-x medium-entropy alloys

Title
FCC to BCC transformation-induced plasticity based on thermodynamic phase stability in novel V10Cr10Fe45CoxNi35-x medium-entropy alloys
Authors
JO, YONGHEECHOI, WON MIKIM, DONGGEUNZARGARAN, ALIREZASOHN, SEOK SUKIM, HYOUNG SEOPLEE, BYEONG JOOKIM, NACK JOONLEE, SUNG HAK
Date Issued
Jan-2019
Publisher
Nature Publishing Group
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.
URI
http://oasis.postech.ac.kr/handle/2014.oak/99338
ISSN
2045-2322
Article Type
Article
Citation
Scientific Reports, vol. 9, no. 1, page. 2948, 2019-01
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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