Strengthening of cost-effective Co-free medium entropy alloys by Al/C alloying

D. H. Chung, Y. K. Kim, J. H. Lee, H. J. Kwon, K. R. Lim, J. B. Seol, Y. S. Na

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of the elemental Al or C addition on the microstructure and room-temperature mechanical properties of a cost-effective Cr12Fe60Mn16Ni12 medium-entropy alloy were investigated. The yield stress of a medium-entropy alloy substantially increased from 230 MPa to 458 MPa following the addition of small amounts of elemental Al (∼2.0 at.%) or C (∼1.0 at.%). Throughout experimentation and theoretical modeling, we were able to systematically show that the improvement in the yield stress following the Al/C addition was attributed to the combination of various strengthening mechanisms, such as grain boundary strengthening, precipitation strengtheing, and solid-solution strengthening mainly caused by the lattice distortion or lattice strain. On the fundamental level, this work provides insights into the effect of the lattice constant on the stress increase for both substitutional and interstitial solid-solution strengthening.

Original languageEnglish
Article number144080
JournalMaterials Science and Engineering A
Volume857
DOIs
Publication statusPublished - 2022 Nov 1
Externally publishedYes

Keywords

  • Interstitial strengthening
  • Lattice friction stress
  • Medium entropy alloys (MEAs)
  • Strengthening mechanisms
  • Substitutional strengthening

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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