open access publication

Article, 2021

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

Materials Letters, ISSN 1873-4979, 0167-577X, Volume 283, Page 128896, 10.1016/j.matlet.2020.128896

Contributors

Peng, Ya Wei 0000-0002-5631-5269 (Corresponding author) [1] [2] [3] Gong, Jian Ming [1] [2] Christiansen, Thomas Lundin 0000-0001-7144-1557 [3] Somers, Marcel Adrianius Johannes 0000-0001-7773-1432 (Corresponding author) [3]

Affiliations

  1. [1] Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, China
    2. [NORA names: Miscellaneous; China; Asia, East];
  2. [2] Nanjing Tech University
    3. [NORA names: China; Asia, East];
  3. [3] Technical University of Denmark
    4. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD]

Abstract

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.

Keywords

CoCrFeNi, CoCrFeNi high-entropy alloy, accommodation, alloy, atoms, carbon, carbon atoms, carburization, carburized case, cases, entropy alloys, expansion, face-centered, fcc, gaseous carburization, hardening, hardness, hardness of high-entropy alloys, high-entropy alloys, i., interstitial solid solution, interstitials, lattice, lattice expansion, low temperatures, low-temperature gaseous carburization, plastic accommodation, region, solid solution, solution, strain, strain hardening, substrate, supersaturated interstitial solid solution, surface, surface hardening, surface hardness, surface modification, surface region

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