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 be an appropriate design strategy to develop new ultrastrong alloys for cryogenic applications.
Original language | English |
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Pages (from-to) | 67-72 |
Number of pages | 6 |
Journal | Scripta Materialia |
Volume | 171 |
DOIs | |
Publication status | Published - 2019 Oct |
Bibliographical note
Funding Information:This work was supported by the Korea University Grant for the seventh author, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF–2016M3D1A1023383 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials .
Publisher Copyright:
© 2019 Acta Materialia Inc.
Keywords
- Cryogenic strength
- High-entropy alloy
- Phase stability
- Strain hardening
- Transformation induced plasticity
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys