Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting

Shuqing Yuan; Zhenguang Gao; Hui Fu; Chi Fai Cheung; Xu Sheng Yang

doi:10.1016/j.jallcom.2023.171802

Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting

Shuqing Yuan, Zhenguang Gao, Hui Fu, Chi Fai Cheung, Xu Sheng Yang

Research output: Journal article publication › Journal article › Academic research › peer-review

6 Citations (Scopus)

Abstract

In this work, a ∼400 µm-thick hardened and corrosion-resistant surface layer was fabricated upon the (CrCoNi)₉₂Si₄B₄ medium-entropy alloy using laser surface remelting technique. Detailed microstructure observations unveil that dual-phase equiaxed grains with major FCC and minor BCT Cr₂B phases in the recrystallized (CrCoNi)₉₂Si₄B₄ alloy are reconstructed into laser-remelted hypoeutectic nanostructured surface consisting of primary FCC phase and nanostructured FCC/BCT eutectic network. Such hypoeutectic nanostructured surface shows superior corrosion resistance, as evidenced by higher corrosion potential and lower corrosion current density than the as-cast and fully recrystallized counterparts. Galvanic corrosion prevails in all samples, while the laser-remelted surface exhibits ∼ 5 times higher resistance due to the impedance of the nanoscale eutectic network architected in hypoeutectic nanostructure.

Original language	English
Article number	171802
Number of pages	13
Journal	Journal of Alloys and Compounds
Volume	967
DOIs	https://doi.org/10.1016/j.jallcom.2023.171802
Publication status	Published - 10 Dec 2023

Keywords

CoCrNi
Corrosion resistance
Hypoeutectic nanostructure
Laser surface remelting
Medium/High-entropy alloy

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2023.171802

Cite this

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title = "Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting",

abstract = "In this work, a ∼400 µm-thick hardened and corrosion-resistant surface layer was fabricated upon the (CrCoNi)92Si4B4 medium-entropy alloy using laser surface remelting technique. Detailed microstructure observations unveil that dual-phase equiaxed grains with major FCC and minor BCT Cr2B phases in the recrystallized (CrCoNi)92Si4B4 alloy are reconstructed into laser-remelted hypoeutectic nanostructured surface consisting of primary FCC phase and nanostructured FCC/BCT eutectic network. Such hypoeutectic nanostructured surface shows superior corrosion resistance, as evidenced by higher corrosion potential and lower corrosion current density than the as-cast and fully recrystallized counterparts. Galvanic corrosion prevails in all samples, while the laser-remelted surface exhibits ∼ 5 times higher resistance due to the impedance of the nanoscale eutectic network architected in hypoeutectic nanostructure.",

keywords = "CoCrNi, Corrosion resistance, Hypoeutectic nanostructure, Laser surface remelting, Medium/High-entropy alloy",

author = "Shuqing Yuan and Zhenguang Gao and Hui Fu and Cheung, {Chi Fai} and Yang, {Xu Sheng}",

note = "Funding Information: This work was supported by the Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515011322 ), PolyU grant (No. G-UAMV ) and funding support to the State Key Laboratories in Hong Kong from the Innovation and Technology Commission of the Government of the HKASR, China . SY and ZG were supported by the grants from the Research Committee of PolyU under student account codes RK2J and RHVR, respectively. Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

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doi = "10.1016/j.jallcom.2023.171802",

language = "English",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting

AU - Yuan, Shuqing

AU - Gao, Zhenguang

AU - Fu, Hui

AU - Cheung, Chi Fai

AU - Yang, Xu Sheng

N1 - Funding Information: This work was supported by the Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515011322 ), PolyU grant (No. G-UAMV ) and funding support to the State Key Laboratories in Hong Kong from the Innovation and Technology Commission of the Government of the HKASR, China . SY and ZG were supported by the grants from the Research Committee of PolyU under student account codes RK2J and RHVR, respectively. Publisher Copyright: © 2023 Elsevier B.V.

PY - 2023/12/10

Y1 - 2023/12/10

N2 - In this work, a ∼400 µm-thick hardened and corrosion-resistant surface layer was fabricated upon the (CrCoNi)92Si4B4 medium-entropy alloy using laser surface remelting technique. Detailed microstructure observations unveil that dual-phase equiaxed grains with major FCC and minor BCT Cr2B phases in the recrystallized (CrCoNi)92Si4B4 alloy are reconstructed into laser-remelted hypoeutectic nanostructured surface consisting of primary FCC phase and nanostructured FCC/BCT eutectic network. Such hypoeutectic nanostructured surface shows superior corrosion resistance, as evidenced by higher corrosion potential and lower corrosion current density than the as-cast and fully recrystallized counterparts. Galvanic corrosion prevails in all samples, while the laser-remelted surface exhibits ∼ 5 times higher resistance due to the impedance of the nanoscale eutectic network architected in hypoeutectic nanostructure.

AB - In this work, a ∼400 µm-thick hardened and corrosion-resistant surface layer was fabricated upon the (CrCoNi)92Si4B4 medium-entropy alloy using laser surface remelting technique. Detailed microstructure observations unveil that dual-phase equiaxed grains with major FCC and minor BCT Cr2B phases in the recrystallized (CrCoNi)92Si4B4 alloy are reconstructed into laser-remelted hypoeutectic nanostructured surface consisting of primary FCC phase and nanostructured FCC/BCT eutectic network. Such hypoeutectic nanostructured surface shows superior corrosion resistance, as evidenced by higher corrosion potential and lower corrosion current density than the as-cast and fully recrystallized counterparts. Galvanic corrosion prevails in all samples, while the laser-remelted surface exhibits ∼ 5 times higher resistance due to the impedance of the nanoscale eutectic network architected in hypoeutectic nanostructure.

KW - CoCrNi

KW - Corrosion resistance

KW - Hypoeutectic nanostructure

KW - Laser surface remelting

KW - Medium/High-entropy alloy

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VL - 967

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Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting

Abstract

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