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

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

doi:10.1016/j.matlet.2020.128896

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

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

School of Mechanical and Power Engineering

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

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 HV_0.1N, which is about 5 times the hardness of the substrate.

Original language	English
Article number	128896
Journal	Materials Letters
Volume	283
DOIs	https://doi.org/10.1016/j.matlet.2020.128896
State	Published - 15 Jan 2021

Keywords

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

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10.1016/j.matlet.2020.128896

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title = "Surface modification of CoCrFeNi high entropy alloy by low-temperature gaseous carburization",

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.",

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doi = "10.1016/j.matlet.2020.128896",

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T1 - Surface modification of CoCrFeNi high entropy alloy by low-temperature gaseous carburization

AU - Peng, Yawei

AU - Gong, Jianming

AU - Christiansen, Thomas L.

AU - Somers, Marcel A.J.

PY - 2021/1/15

Y1 - 2021/1/15

N2 - 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.

AB - 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.

KW - Diffusion

KW - Expanded FCC

KW - Hardening Mechanism

KW - High entropy alloy

KW - Low-temperature gaseous carburization

KW - Microstructure

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DO - 10.1016/j.matlet.2020.128896

M3 - 文章

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VL - 283

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JF - Materials Letters

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

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Keywords

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