Experimental assessment of the thermodynamic factor for diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys

Vaidya, M.; Muralikrishna, G. Mohan; Divinski, Sergiy V.; Murty, B.S.

doi:10.1016/j.scriptamat.2018.07.040

Cited by 39 publications

(7 citation statements)

References 15 publications

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“…The further works of the team from Münster include three articles [41][42][43]. In [41], the authors studied, using tracer method, tracer diffusion of Co, Cr, Fe, and Ni in Co20Cr20Fe20Mn20Ni20, Co10Cr10Fe10Mn10Ni60, and Co2Cr2Fe2Mn2Ni92 alloys, at the temperature of 1373 K. The microstructure of alloys was studied, showing exclusive existence of FCC solid solution in all considered materials.…”

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

“…The further works of the team from Münster include three articles [41][42][43]. In [41], the authors studied, using tracer method, tracer diffusion of Co, Cr, Based on these results, the authors concluded that the volume diffusion coefficients of solutes (Co, Cr, and Mn) are slower in the high entropy alloy than in the dilute solid solutions.…”

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

“…In [42], Vaidya et al investigated the thermodynamic factor ϕ for diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys, namely its product with the vacancy wind factor S, ϕS. In the experimental part of the study, the authors prepared a number of separate, quasi-binary diffusion couples, such as, e.g., the one based on the Co20Cr25Fe25Ni30-Co30Cr25Fe25Ni20 alloys, or the other one based on the Co15Cr20Fe20Mn20Ni25-Co25Cr20Fe20Mn20Ni15 (the "Co-Ni" diffusion couples).…”

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

“…However, a recent reevaluation of the data obtained by Vaidya et al, performed by Belova and Murch [74], showed a very different view. In this study, the authors pointed out that the reference Manning factor should be taken for the quaternary and quinary system as, respectively, 2 and 2.5, instead of 1 as it was in [42]. As a result, the corrected values of thermodynamic factors varied in ranges of 0.43 to 0.77 and 0.84 to 2.34 for CoCrFeNi and CoCrFeMnNi, respectively, indicating behavior much closer to ideal in the case of the latter alloy and more in line with the assumptions of Tsai et al [28].…”

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

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State-of-the-Art Diffusion Studies in the High Entropy Alloys

Dąbrowa

Danielewski

2020

Metals

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The development of the high entropy alloys (HEAs) is amongst the most important topics in the field of materials science during the last two decades. The concept of multicomponent, near-equimolar systems has been already applied to the number of other systems, including oxides, carbides, diborides, silicides, and it can be expected that other groups of materials will follow. One of the main driving forces for the development of HEAs is the so-called “four core effects”: high entropy effects, severe lattice distortion, cocktail effect, and sluggish diffusion effect. Their existence and extent has been a subject of heated discussion. Probably the least studied of them is the sluggish diffusion effect, which is of the, especially, high importance from the point of view of the most possible applications of HEAs—as high-temperature materials. Its alleged existence carries a promise of obtaining materials with superior mechanical properties, higher creep resistance, and less susceptibility to high-temperature corrosion. In the current review, the state-of-the-art of diffusion studies in HEAs was presented, as well as the resulting conclusions concerning the existence of the sluggish diffusion effect. Based on the literature analysis, it can be stated that there is no experimental evidence, which would support the existence of the sluggish diffusion in HEAs on the level of tracer and self-diffusivities. Nevertheless, it can be pointed out that our current state of knowledge on the diffusion in HEAs is still far from complete; therefore, further directions of studies are proposed.

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Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

Section: Tracer Diffusion In Cocrfenimentioning

confidence: 99%

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State-of-the-Art Diffusion Studies in the High Entropy Alloys

Dąbrowa

Danielewski

2020

Metals

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“…Confusion has created concerning the reference Manning factor because of the use of composition (N) instead of Modified composition [23], which might have resulted unknowingly because of a typing error in Ref. [24]. We have advocated the use of M instead of N in this type of couple from the beginning [10,19].…”

Section: Pseudo-binarymentioning

confidence: 99%

Solving the issues of multicomponent diffusion in an equiatomic NiCoFeCr medium entropy alloy

2020

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Estimating the diffusion coefficients experimentally in a four-component inhomogeneous alloy following the conventional diffusion couple method by intersecting three couples at the same composition is difficult unless a small composition range of constant diffusivity is identified. Additionally, the intrinsic diffusion coefficients of the components cannot be estimated in a system with more than two components. To solve these issues, we have followed the pseudo-binary and pseudo-ternary diffusion couple methods for estimating the diffusion coefficients at the equiatomic composition of NiCoFeCr medium entropy alloy. Along with the pseudo-binary interdiffusion coefficients, we have estimated the intrinsic diffusion coefficients of all the components by designing the pseudo-binary couples such that Ni and Co develop the diffusion profiles keeping Fe and Cr constant in one couple and Fe and Cr develop the diffusion profiles keeping Ni and Co constant in another couple. Subsequently, we have proposed the relations for calculating the tracer diffusion coefficients utilizing the thermodynamic details. We have found a good match with the data estimated directly following the radiotracer method at the equiatomic composition. Following, we have produced three pseudo-ternary diffusion couples intersecting at the compositions close to the equiatomic composition. The main pseudo-ternary interdiffusion coefficients of Fe are found to be higher than Ni and Co. Therefore, we have estimated different types of diffusion coefficients highlighting the complex diffusion process in the four-component NiCoFeCr medium entropy alloy.

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Effect of ultrasonic treatment on interfacial reactions and microstructure of SnCr/CuFeNiCoCr solder joints

Yang

2021

J Mater Sci: Mater Electron

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Experimental assessment of the thermodynamic factor for diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys

Cited by 39 publications

References 15 publications

State-of-the-Art Diffusion Studies in the High Entropy Alloys

State-of-the-Art Diffusion Studies in the High Entropy Alloys

Solving the issues of multicomponent diffusion in an equiatomic NiCoFeCr medium entropy alloy

Effect of ultrasonic treatment on interfacial reactions and microstructure of SnCr/CuFeNiCoCr solder joints

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