Hall-Petch relationship and corrosion behavior of cold-rolled CoNiFe medium entropy alloy

An, Xulong; Zhao, Hongjin; Chu, Chenglin; Taguchi, Dai; Lü, Tao; Huang, Zhihai; Guo, Chaowei; Chu, Paul K.

doi:10.1016/j.jallcom.2019.151698

Cited by 25 publications

(5 citation statements)

References 44 publications

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“…Studies by Ma et al [9] demonstrated that high strained cold rolling deformation such as 70 and 90 percent reduction in thickness in Ta-4 W alloy improves corrosion resistance due to preferential crystallographic orientations. More studies [10][11][12][13], also confirms that cold rolling deformation effect in metal-alloys greatly influence the corrosion current density and corrosion potentials.…”

Section: Introductionmentioning

confidence: 63%

Electrochemical Corrosion Study of Cold-Rolled AA8015-Alloy Processed by Reversing Cold Rolling Mill at Varying Surface Roughness

Olaogun¹,

Akinlabi²,

Abima³

2024

Recent Advancements in Aluminum Alloys

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AA8015-alloy is a general-purpose aluminium alloy having a wide range of applications. Electrochemical corrosion testing of cold-rolled AA8015-alloy processed by reversing cold-rolling mill at different surface roughness in natural seawater were investigated. The AA8015-alloy utilised in this study was cold-rolled in a reversible Achenbach cold-rolling mill in four number of passes to a gauge thickness of 1.2 mm. This industrial cold rolling process was achieved at Tower Aluminium Rolling Mill, Sango-Ota, Nigeria. The different surface roughness’s each with three cold mounted samples, 1.54 μm, 0.83 μm, 0.18 μm and 0.04 μm were achieved on automated polishing machine using 320-grit, 800-grit, 1200-grit and diamond abrasive MD-Mol respectively. Electrochemical corrosion experiments were conducted on the samples in natural seawater using a computer-controlled potentiostat in an open polarisation cell set-up at room-temperature. The corrosion behaviour on surface morphologies of the samples was observed by high-mega-pixel camera and scanning electron microscope. Findings reveal asymmetric polarisation curves, and the polarisation resistance increases as the surface roughness decreases. Consequently, corrosion-rate reduces as the surface get smoother and EDS elemental analysis shows the existence of insoluble sulphate and chloride complexes formed on the surfaces. Conclusively, surface roughness affects the corrosion resistance of cold-rolled AA8015-alloy in natural seawater.

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Section: Introductionmentioning

confidence: 63%

Electrochemical Corrosion Study of Cold-Rolled AA8015-Alloy Processed by Reversing Cold Rolling Mill at Varying Surface Roughness

Olaogun¹,

Akinlabi²,

Abima³

2024

Recent Advancements in Aluminum Alloys

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“…While Co, Fe, and Ni exhibit close-to-zero mixing enthalpies with each other, V has negative enthalpies with them ( 35 ). This can be corroborated by the fact that the equimolar CoFeNi and non-equimolar Ni 2 CoFe MEAs remain a single-phase fcc structure after annealing at different temperatures ( 33 , 36 ). The addition of V to the Co-Fe-Ni system lowers the mixing enthalpy, making the formation of chemical short-range order or even LRO easier, thus reducing the Gibbs free energy ( 37 , 38 ).…”

Section: Discussionmentioning

confidence: 78%

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Gu,

Zhao,

et al. 2024

Sci. Adv.

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Long-range ordered phases in most high-entropy and medium-entropy alloys (HEAs/MEAs) exhibit poor ductility, stemming from their brittle nature of complex crystal structure with specific bonding state. Here, we propose a design strategy to severalfold strengthen a single-phase face-centered cubic (fcc) Ni 2 CoFeV MEA by introducing trigonal κ and cubic L1 2 intermetallic phases via hierarchical ordering. The tri-phase MEA has an ultrahigh tensile strength exceeding 1.6 GPa and an outstanding ductility of 30% at room temperature, which surpasses the strength-ductility synergy of most reported HEAs/MEAs. The simultaneous activation of unusual dislocation multiple slip and stacking faults (SFs) in the κ phase, along with nano-SF networks, Lomer-Cottrell locks, and high-density dislocations in the coupled L1 2 and fcc phases, contributes to enhanced strain hardening and excellent ductility. This work offers a promising prototype to design super-strong and ductile structural materials by harnessing the hierarchical ordered phases.

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“…Huang et al (2020) found that the yield strength, tensile strength and hardness of CoCrNi alloys rolled at 25°C and then annealed at 600°C for 1 h reached 1.43 GPa, 1.61 GPa and 407.6 HV, respectively. An et al (2019) found that the grain boundary characteristics of CoNiFe MEA after cold-rolling and then annealing at different temperatures had a significant effect on its electrochemical corrosion performance. However, most studies about CoCrNi MEA mainly focused on improving its mechanical properties by adjusting the microstructure; the influence of microstructure of CoCrNi alloy on the corrosion resistance was rarely reported.…”

Section: Introductionmentioning

confidence: 97%

Influence of microstructure of CoCrNi medium entropy alloy on its corrosion behavior

Shi,

Ling,

Kuang

et al. 2023

ACMM

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Purpose The purpose of this paper is to reveal the effect of microstructure on the corrosion behavior of CoCrNi alloy in 3.5 Wt.% NaCl solution. Design/methodology/approach The as-cast CoCrNi alloy was prepared by arc melting, and the cold-rolled and annealed alloys were prepared by processing the as-cast alloy. Findings The experimental results showed that a protective passivation film was formed on the surfaces of these CoCrNi MEA, and the stability and compactness of alloys increased in the sequence of cold-rolled, as-cast and annealed CoCrNi alloys. The annealed CoCrNi alloys had the best pitting resistance. Originality/value This study proposes the effect of the microstructure of CoCrNi alloy on corrosion resistance.

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Hall-Petch relationship and corrosion behavior of cold-rolled CoNiFe medium entropy alloy

Cited by 25 publications

References 44 publications

Electrochemical Corrosion Study of Cold-Rolled AA8015-Alloy Processed by Reversing Cold Rolling Mill at Varying Surface Roughness

Electrochemical Corrosion Study of Cold-Rolled AA8015-Alloy Processed by Reversing Cold Rolling Mill at Varying Surface Roughness

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Influence of microstructure of CoCrNi medium entropy alloy on its corrosion behavior

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