Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Dong Geun Kim, Yong Hee Jo, Junha Yang, Won Mi Choi, Hyoung Seop Kim, Byeong Joo Lee, Seok Su Sohn, Sunghak Lee

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


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 languageEnglish
Pages (from-to)67-72
Number of pages6
JournalScripta Materialia
Publication statusPublished - 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.


  • 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


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