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Cited 7 time in webofscience Cited 11 time in scopus
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Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Title
Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation
Authors
Kim, Dong GeunJo, Yong HeeYang, JunhaChoi, Won-MiKim, Hyoung SeopLee, Byeong-JooSohn, Seok SuLee, Sunghak
Date Issued
Oct-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V10Cr10Co30Fe50 alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could bean appropriate design strategy to develop new ultrastrong alloys for cryogenic applications. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100097
ISSN
1359-6462
Article Type
Article
Citation
SCRIPTA MATERIALIA, vol. 171, page. 67 - 72, 2019-10
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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