Surface modification of CoCrFeNi high entropy alloy by low-temperature gaseous carburization

Yawei Peng*, Jianming Gong, Thomas L. Christiansen, Marcel A.J. Somers

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Low-temperature (470 °C) gaseous carburization is successfully employed in surface hardening of a CoCrFeNi high entropy alloy. After low-temperature gaseous carburization, a carburized case of expanded face-centered cubic (FCC) structure, i.e., a carbide-free supersaturated interstitial solid solution of carbon (maximum of ~3.0 wt%) in FCC, forms in the surface region of the high entropy alloy. Due to solid solution strengthening by interstitially dissolved carbon atoms and strain hardening caused by plastic accommodation of the lattice expansion, the surface hardness of high entropy alloy is significantly enhanced. The surface hardness reaches 1221 HV0.1N, which is about 5 times the hardness of the substrate.

Original languageEnglish
Article number128896
JournalMaterials Letters
Number of pages4
Publication statusPublished - 2021


  • Diffusion
  • Expanded FCC
  • Hardening Mechanism
  • High entropy alloy
  • Low-temperature gaseous carburization
  • Microstructure

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