Unraveling the deformation behavior of the Fe45Co25Ni10V20 high entropy alloy

Y. X. Li, Raymond Kwesi Nutor, Q. K. Zhao, X. P. Zhang, Q. P. Cao, S. S. Sohn, X. D. Wang, S. Q. Ding, D. X. Zhang, H. F. Zhou, J. W. Wang, J. Z. Jiang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Here we report on the tensile deformation behavior of a face-centered cubic (FCC)-structured Fe45Co25Ni10V20 high-entropy alloy at cryogenic temperature (77 K). The alloy displays an impressive 1.1 GPa tensile strength while maintaining an ultrahigh fracture elongation of 82% with a minimum strain hardening rate at a true strain of about 40%. We elucidate such unique mechanical properties, originating from the strain-induced FCC to body-centered cubic (BCC) martensitic transformation, where the high-stress concentrations at grain boundaries or intersection of stacking faults can stimulate phase transition. The martensitic transformation can induce strain softening by consuming the stored deformation energy while contributing to the strain hardening via the transformation itself and further deformation of BCC phases. Such a dynamic balance between softening and hardening enables a relatively uniform plastic flow, resulting in a plastic deformation with a strain range of up to 35% delaying macroscopic necking. The findings provide further insights into the significance of transformation-induced plasticity effects on the cryogenic performance of alloys.

Original languageEnglish
Article number103619
JournalInternational Journal of Plasticity
Volume165
DOIs
Publication statusPublished - 2023 Jun

Bibliographical note

Funding Information:
Financial support from the National Natural Science Foundation of China ( 11975202 , 12275237 , 12222210 , and 52071284 ), Natural Science Foundation of Zhejiang Province ( LY15E010003 and LZ20E010002 ), and the Fundamental Research Funds for the Central Universities are gratefully acknowledged. The computer resource at National Supercomputer Center in Beijing is also gratefully acknowledged.

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • High-entropy alloys
  • Plastic instability
  • Stacking faults
  • Tensile deformation
  • Transformation-induced plasticity

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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