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 S Sohn, Sunghak Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)67-72
Number of pages6
JournalScripta Materialia
Volume171
DOIs
Publication statusPublished - 2019 Oct 1

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

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