Microstructure and corrosion behavior of AlCoCrFeNiSi0.1 high-entropy alloy

Xiang, Chao; Zhang, Z.M.; Fu, Huameng; Han, En‐Hou; Zhang, H.F.; Wang, Jingyi

doi:10.1016/j.intermet.2019.106599

Cited by 55 publications

(17 citation statements)

References 69 publications

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“…This fact indicates that the alloy showed no signs of severe corrosion, while some residues of the corrosion solution simply covered its surface. As such, the observation of the sample does not reveal any selective galvanic inter-dendritic corrosion as recorded in other systems of the literature [19][20][21][22][23][24].…”

Section: Corrosion Behavior Of Motanbvti Hea In 35 Wt% Nacl Solutionmentioning

confidence: 58%

Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

Poulia¹,

Mathiou²,

Karantzalis³

2019

ACSM

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The purpose of this study is to investigate the corrosion behavior of MoTaNbVTi refractory high entropy alloy in 3.5 wt.% NaCl and Hank solution. Regarding the sea water testing environment, data from the electrochemical analysis of the polarization curves created some first suspicions about a local corrosion tendency. However, the corroded surfaces and crosssections' Scanning Electron Microscopy and Energy Dispersive Spectroscopy analysis verified no signs of any type of degradation. Moreover, the results indicate that no selective corrosion along the inter-dendritic regions of the alloy, was found. As far as the Hank solution is concerned, once again, some preliminary considerations of a possible susceptibility to local forms of corrosion were shown off, however, no evidence of corrosion signs (either pericrystalline or pitting) was detected. The findings of this research suggest that MoTaNbVTi presented an excellent response to these types of corrosion environments and could be used as an ideal candidate for that kind of applications.

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Section: Corrosion Behavior Of Motanbvti Hea In 35 Wt% Nacl Solutionmentioning

confidence: 58%

Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

Poulia¹,

Mathiou²,

Karantzalis³

2019

ACSM

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“…Generally, the formation of pits in AlCoCrFeNi-based HEAs is closely related to a weakening of the passive films on the Crdepleted region. That is, the Cr-depleted dendrites in the cast specimen suffered from serious preferential dissolution, whereas the Cr-rich interdendritic regions remained largely resistant to corrosion 22,24 . This is consistent with the morphology of the corroded surface for the cast specimen, as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The corrosion characteristics of HEAs have been studied extensively [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] . Kumar et al 20 revealed that a single-phase FCC Al 0.1 CoCrFeNi HEA has a superior corrosion resistance to that of 304 stainless steel in a 3.5 wt% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

Corrosion mechanism of an equimolar AlCoCrFeNi high-entropy alloy additively manufactured by electron beam melting

et al. 2020

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High-entropy alloys (HEAs) have emerged as a class of structural alloys with various attractive properties, and their application in additive manufacturing, which enables unprecedented thermal history and geometrical complexity, is promising for realising advanced materials. This study investigates the corrosion behaviour and passive film characteristics of an equimolar AlCoCrFeNi HEA additively manufactured by electron beam melting (EBM). Potentiodynamic polarisation in a 3.5 wt% NaCl solution revealed that the bottom part of the EBM specimen shows better corrosion performance than a conventionally prepared cast specimen in terms of both corrosion and passivation current density, while a continuous increase in the current density without any apparent passivity was observed during the anodic polarisation of the top part. The electrochemical impedance spectroscopic study indicated significant differences in the passive film characteristics between the specimens, and revealed an enhanced chargetransfer resistance and the formation of a more protective passive film of the bottom part. The elemental redistribution, in particular, the enrichment of Cr in the B2 phase during the post-melt high-temperature exposure of the alloy during EBM, was responsible for the improved stability of the passive film, retarding the selective dissolution of the B2 phase in the bottom part. These findings indicate that the microstructural evolution caused by 'in situ annealing' during the EBM process significantly influences the corrosion behaviour of the HEA.

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“…% [1][2][3][4]. Many researchers have contributed their efforts to understanding the fabrication, composition, microstructure, and properties of more than 400 HEAs to date [5][6][7][8][9][10][11][12], where the CoCrFeNi system HEAs have been heavily researched, and many studies in the literature have focused on improving the corrosion resistance of CoCrFeNi system HEAs through the addition of other alloy elements, such as Al, Mn, Mo, Cu, and Ti [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Kao et al [14] investigated the electrochemical passive properties of AlxCoCrFeNi alloys by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and weight loss tests, indicating that a higher amount of Al in AlxCoCrFeNi alloys was harmful to the corrosion resistance in a 0. solution, and the pitting potentials of Al0.5CrFe1.5MnNi0.5 HEAs were significantly lower than those of Al-free CrFe1.5MnNi0.5 HEAs in a 1 M NaCl solution [15].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of AlFeCrCoNiZrx High-Entropy Alloys in 0.5 M Sulfuric Acid Solution

Yu-hong

Jin

Gao

et al. 2021

Metals

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AlCoCrFeNiZrx (x = 0, 0.1, 0.2, 0.3, and 0.5) high-entropy alloys (HEAs) were prepared by a non-consumable vacuum arc melting technology, and the microstructure and corrosion behavior were investigated by XRD, SEM, immersion tests, and electrochemical measurements. The results indicate that galvanic corrosion of the AlCoCrFeNiZrx alloys occurred in 0.5 M H2SO4 solution, and only 0.1 mol of the added Zr could greatly improve the corrosion resistance of the alloys. The corrosion properties of the AlCoCrFeNiZrx HEAs had similar change tendencies with the increase in the Zr content in the immersion tests, potentiodynamic polarization measurements, and electrochemical impedance analysis, that is, the corrosion resistance of the AlCoCrFeNiZrx alloys in a 0.5 M H2SO4 solution first increased and then decreased with the increase in the Zr content. The Zr0.1 alloys were found to have the best selective corrosion and general corrosion resistance with the smallest corrosion rate, whereas the Zr0.3 alloys presented the worst selective corrosion and general corrosion resistance with the highest corrosion rate from both the immersion tests and the potentiodynamic polarization measurements.

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Microstructure and corrosion behavior of AlCoCrFeNiSi0.1 high-entropy alloy

Cited by 55 publications

References 69 publications

Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

Corrosion mechanism of an equimolar AlCoCrFeNi high-entropy alloy additively manufactured by electron beam melting

Corrosion Behavior of AlFeCrCoNiZrx High-Entropy Alloys in 0.5 M Sulfuric Acid Solution

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