Phase stability of non-equiatomic CoCrFeMnNi high entropy alloys

Ma, Duancheng; Yao, Mengji; Pradeep, Konda Gokuldoss; Taşan, Cemal Cem; Springer, Hauke; Raabe, Dierk

doi:10.1016/j.actamat.2015.07.030

Cited by 215 publications

(63 citation statements)

References 34 publications

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“…[4][5][6]8,209 This has been used to explain particular experimental observations in a number of studies. 1,52,53,55,65,69,75,100,124,166,181,205,[210][211][212][213][214] Yeh et al 5,6,8,209 have suggested that anomalously slow diffusion in HEAs originates from fluctuations in the potential energies of lattice sites that are met by diffusing species, Fig. 6.…”

Section: Sluggish Diffusion Kineticsmentioning

confidence: 99%

“…19,213 There is even more potential in using it as a guide for alloy selection, 16,213 particularly when the parametric criteria discussed above are the only alternative option. Perhaps the most important work on the topic of HEA selection has been carried out by Miracle, Senkov and co-workers.…”

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

“…The formation of σ in CrMnFeCoCu, VCrMnCoNi and VMnFeCoNi is also not well predicted by CALPHAD. 19,167,213 Indeed, the accurate prediction of intermetallic phases, the formation of which is of great importance to engineering alloys, appears to be problematic for CALPHAD methods in general.…”

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

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High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

703

299

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High-entropy alloys (HEAs) are a relatively new class of materials that have gained considerable attention from the metallurgical research community over recent years. They are characterised by their unconventional compositions, in that they are not based around a single major component, but rather comprise multiple principal alloying elements. Four core effects have been proposed in HEAs: (1) the entropic stabilisation of solid solutions, (2) the severe distortion of their lattices, (3) sluggish diffusion kinetics and (4) that properties are derived from a cocktail effect. By assessing these claims on the basis of existing experimental evidence in the literature, as well as classical metallurgical understanding, it is concluded that the significance of these effects may not be as great as initially believed. The effect of entropic stabilisation does not appear to be overarching, insufficient evidence exists to establish the strain in the lattices of HEAs, and rapid precipitation observed in some HEAs suggests their diffusion kinetics are not necessarily anomalously slow in comparison to conventional alloys. The meaning and influence of the cocktail effect is also a matter for debate. Nevertheless, it is clear that HEAs represent a stimulating opportunity for the metallurgical research community. The complex nature of their compositions means that the discovery of alloys with unusual and attractive properties is inevitable. It is suggested that future activity regarding these alloys seeks to establish the nature of their physical metallurgy, and develop them for practical applications. Their use as structural materials is one of the most promising and exciting opportunities. To realise this ambition, methods to rapidly predict phase equilibria and select suitable HEA compositions are needed, and this constitutes a significant challenge. However, while this obstacle might be considerable, the rewards associated with its conquest are even more substantial. Similarly, the challenges associated with comprehending the behaviour of alloys with complex compositions are great, but the potential to enhance our fundamental metallurgical understanding is more remarkable. Consequently, HEAs represent one of the most stimulating and promising research fields in materials science at present.

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Section: Sluggish Diffusion Kineticsmentioning

confidence: 99%

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

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High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

703

299

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“…15 As illustrated schematically in Fig. 1, compared with conventional alloys with one or two principal elements plus minor alloying components, as well as equiatomic HEAs with equimolar ratios of all alloy elements, non-equiatomic HEAs greatly expand the compositional space that can be probed.…”

Section: Introductionmentioning

confidence: 99%

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

Raabe

2017

JOM

Self Cite

257

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We present a brief overview on recent developments in the field of strong and ductile non-equiatomic high-entropy alloys (HEAs). The materials reviewed are mainly based on massive transition-metal solute solutions and exhibit a broad spectrum of microstructures and mechanical properties. Three relevant aspects of such non-equiatomic HEAs with excellent strength-ductility combination are addressed in detail, namely phase stability-guided design, controlled and inexpensive bulk metallurgical processing routes for appropriate microstructure and compositional homogeneity, and the resultant microstructure-property relations. In addition to the multiple principal substitutional elements used in these alloys, minor interstitial alloying elements are also considered. We show that various groups of strong and ductile HEAs can be obtained by shifting the alloy design strategy from single-phase equiatomic to dual-or multiphase non-equiatomic compositional configurations with carefully designed phase instability. This design direction provides ample possibilities for joint activation of a number of strengthening and toughening mechanisms. Some potential research efforts which can be conducted in the future are also proposed.

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“…This conventional method is not effective when developing HEAs with a new combination of elements among numerous possibilities. The CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) approach may be the best way for designing new HEAs because of its capability in predicting the phase stability [13][14][15][16]. However, the application of CALPHAD to the design of new HEAs is challenging because of the lack of a reliable thermodynamic database to cover the entire composition range [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Kang

Lim

Won

et al. 2018

Entropy

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Abstract:In this study, new high-entropy alloys (HEAs), which contain lightweight elements, namely Al and Ti, have been designed for intermediate temperature applications. Cr, Mo, and V were selected as the elements for the Al-Ti-containing HEAs by elemental screening using their binary phase diagrams. AlCrMoTi and AlCrMoTiV HEAs are confirmed as solid solutions with minor ordered B2 phases and have superb specific hardness when compared to that of commercial alloys. The present work demonstrates the desirable possibility for substitution of traditional materials that are applied at intermediate temperature to Al-Ti-containing lightweight HEAs.

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Phase stability of non-equiatomic CoCrFeMnNi high entropy alloys

Cited by 215 publications

References 34 publications

High-entropy alloys: a critical assessment of their founding principles and future prospects

High-entropy alloys: a critical assessment of their founding principles and future prospects

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

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