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

机械与动力工程学院

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摘要

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.

源语言	英语
文章编号	128896
期刊	Materials Letters
卷	283
DOI	https://doi.org/10.1016/j.matlet.2020.128896
出版状态	已出版 - 15 1月 2021

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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.",

keywords = "Diffusion, Expanded FCC, Hardening Mechanism, High entropy alloy, Low-temperature gaseous carburization, Microstructure",

author = "Yawei Peng and Jianming Gong and Christiansen, {Thomas L.} and Somers, {Marcel A.J.}",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

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day = "15",

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

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VL - 283

JO - Materials Letters

JF - Materials Letters

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

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