A quasi-in-situ EBSD study of the thermal stability and grain growth mechanisms of CoCrNi medium entropy alloy with gradient-nanograined structure

Zhao, Peng; Guan, Bo; Tong, Yonggang; Wang, Run-Zi; Li, X.; Zhang, X.-C.; Tu, S.T.

doi:10.1016/j.jmst.2021.07.054

Cited by 28 publications

(4 citation statements)

References 52 publications

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“…The severely refined surface microstructure indicates significant plastic deformation in both the Cu matrix and Fe phases during USRP. This gradient structure is similar to those observed in other alloys, such as medium entropy alloy [22]. The surface morphology of the Cu-Fe plate before and after ultrasonic surface rolling process were examined and shown in Figure 3.…”

Section: Resultssupporting

confidence: 79%

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Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Guan

et al. 2023

Metals

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Immiscible Cu-Fe alloys exhibit poor corrosion resistance due to different corrosion potentials between the constituent phases, which limits their application. In this paper, a composite gradient-structured Cu-10 wt.%Fe plate was prepared via the ultrasonic surface rolling process (USRP). The microstructure evolution, mechanical properties and corrosion behavior were studied. The results demonstrate that USRP effectively enhances both the strength and corrosion resistance of the Cu-10Fe alloy. The improved strength is related to the combined effects of Hall–Petch strengthening, dislocation strengthening, and additional strengthening resulting from homogeneous deformation between the surface layer and the matrix. The enhanced corrosion resistance is primarily attributed to the refined microstructure of the surface layer after USRP, which facilitates the formation of a protective passivation film.

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Section: Resultssupporting

confidence: 79%

“…During USRP, the down-force of the head is about 135 N, and the total number of rolling passes is 15 passes. A similar method can be found in our previous reports [22].…”

Section: Materials Preparationmentioning

confidence: 76%

Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Guan

et al. 2023

Metals

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“…Hydrogen evolution reaction may occur in defect sites due to the change of valence state of the Cr element (Figure 8). Besides, as the reaction proceeds, the hydrogen causes local pressure (reaction (11)). The hydrogen pressure in the metastable and stable pitting weakens the passivity of the MEA and makes it difficult to form an intact passivation film [53].…”

Section: Metastable Pitting Analysismentioning

confidence: 99%

“…an alloy comprising at least three main elements in equiatomic or non-equiatomic percentages, which has the advantage of forming straightforward structures with few or no complex phase compositions. Because of the single controllable microstructures and outstanding application properties, such as remarkable mechanical capabilities [6][7][8], wear resistance [9,10], and thermal stability [11,12], these alloys provide a broad space in performance research. Among them, the equiatomic CoCrNi MEA with a face-centered cubic (FCC) is one of the most typical MEAs and shows outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on corrosion behaviour of CoCrNi MEA imposed by alternating current in Na₂CO₃/NaHCO₃ solution

Zhang,

Zhu,

Yuan

et al. 2023

Corrosion Engineering, Science and Technology: The Internationa

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The corrosion behaviour and mechanism of CoCrNi medium-entropy alloy (MEA) imposed by alternating current (AC) in HCO 3 − /CO 3 2− solution with various pH were systematically investigated via a series of corrosion tests. The results showed that with the augment of pH value, the polarisation resistance of the MEA decreased significantly, Ep shifted negatively, and ipI value increased, as well as corrosion rate was enhanced, revealing that the corrosion resistance was weakened. As solution pH increased, the formation of secondary passivation zone became easier, which may be attributed to the reaction conversion process of Cr(III) to Cr(VI) species. Moreover, the increase in pH led to an increase in defect density and a thinning of passivation film, facilitating the corrosion of the MEA. AC interference accelerated the ion exchange process and promoted the formation possibility of stable pitting. Higher iAC and pH inhibited the repassivation of metastable pitting, and increased the pitting susceptibility.

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Precipitation and heterogeneous strengthened CoCrNi-based medium entropy alloy with excellent strength-ductility combination from room to cryogenic temperatures

Xie

Zhao

Tong

et al. 2022

Sci. China Technol. Sci.

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A quasi-in-situ EBSD study of the thermal stability and grain growth mechanisms of CoCrNi medium entropy alloy with gradient-nanograined structure

Cited by 28 publications

References 52 publications

Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Effect of pH on corrosion behaviour of CoCrNi MEA imposed by alternating current in Na₂CO₃/NaHCO₃ solution

Precipitation and heterogeneous strengthened CoCrNi-based medium entropy alloy with excellent strength-ductility combination from room to cryogenic temperatures

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A quasi-in-situ EBSD study of the thermal stability and grain growth mechanisms of CoCrNi medium entropy alloy with gradient-nanograined structure

Cited by 28 publications

References 52 publications

Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Mechanical and Corrosion Behavior of a Composite Gradient-Structured Cu-Fe Alloy

Effect of pH on corrosion behaviour of CoCrNi MEA imposed by alternating current in Na2CO3/NaHCO3 solution

Precipitation and heterogeneous strengthened CoCrNi-based medium entropy alloy with excellent strength-ductility combination from room to cryogenic temperatures

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Effect of pH on corrosion behaviour of CoCrNi MEA imposed by alternating current in Na₂CO₃/NaHCO₃ solution