Deformation and annealing behaviors of high-entropy alloy Al0.5CoCrCuFeNi

Tsai, Che-Wei; Chen, Yuliang; Tsai, Ming–Hung; Yeh, Jien‐Wei; Shun, Tao-Tsung; Chen, Swe-Kai

doi:10.1016/j.jallcom.2009.06.182

Cited by 268 publications

(113 citation statements)

References 15 publications

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“…[60] Deformation twinning is observed again in this alloy. Prevalence of twinning appears to result from the blockage of local slip by the Widmanstätten precipitates.…”

Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 66%

“…Of all the HEA systems reported, Al-Co-Cr-Cu-Fe-Ni [7,8,21,35,36,49,[60][61][62][63][64][65][66][67][68] and its Cu-free version Al-Co-Cr-Fe-Ni [69][70][71][72][73][74] have been studied most comprehensively. Most of the reported HEA systems emerge from them.…”

Section: Thementioning

confidence: 99%

“…Additionally, remnant Cu in the dendrite region also clusters and forms various kinds of precipitates. [21,35,60] The main phases in cast Al-Co-Cr-Cu-Fe-Ni alloy include FCC, BCC/B2, and the Cu-rich phase (also has an FCC structure). The relative volume ratio of these phases depends on the composition.…”

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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2,345

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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“…[60] Deformation twinning is observed again in this alloy. Prevalence of twinning appears to result from the blockage of local slip by the Widmanstätten precipitates.…”

Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 66%

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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2,345

853

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“…3,21,[61][62][63][64][65][66][67][68][69][70][71][72][73][74] Part of the Al x CrFeCoNiCu series of alloys, which have received a great deal of attention, 1,64,73,[75][76][77][78][79][80][81][82][83][84][85][86] initial reports appeared to suggest that Al 0.5 CrFeCoNiCu was stable as a single face-centred cubic ( fcc) solid-solution phase. 3,[62][63][64]75,76,78 Subsequent studies, however, found that this not the case, and have 17,31,35,62,69,73,[85][86][87]97,107,113,125,…”

Section: Entropic Stabilisationmentioning

confidence: 99%

“…175,176 Well-established models for solution strengthening have been produced for both dilute and concentrated alloys, [177][178][179] and their modification for HEAs is discussed in Section 8 of this article. A number of studies have suggested that severe lattice distortion contributes significantly to HEA properties, 3,65,75,84,85,97,165,[180][181][182][183][184][185][186] most notably with respect to increasing alloy strength, see for instance 165,187 . Importantly, however, it is apparent that the strengthening effect of precipitates may have been overlooked in some cases.…”

Section: Severely Distorted Latticesmentioning

confidence: 99%

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

Pickering

Jones

2016

International Materials Reviews

672

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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Anomalous Evolution of Strength and Microstructure of High‐Entropy Alloy CoCrFeNiMn after High‐Pressure Torsion at 300 and 77 K

et al. 2019

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Ultrafine and nanocrystalline states of equiatomic face‐centered cubic (fcc) high‐entropy alloy (HEA) CoCrFeNiMn (“Cantor” alloy) are achieved by high‐pressure torsion (HPT) at 300 K (room temperature, RT) and 77 K (cryo). Although the hardness after RT‐HPT reaches exceptionally high values, those from cryo‐HPT are distinctly lower, at least when the torsional strain lies beyond γ = 25. The values are stable even during long‐time storage at ambient temperature. A similar paradoxal result is reflected by torque data measured in situ during HPT processing. The reasons for this paradox are attributed to the enhanced hydrostatic pressure, cryogenic temperature, and especially large shear strains achieved by the cryo‐HPT. At these conditions, selected area electron diffraction (SAD) patterns indicate that a partial local phase change from fcc to hexagonal close‐packed (hcp) structure occurs, which results in a highly heterogeneous structure. This heterogeneity is accompanied by both an increase in average grain size and especially a strong decrease in average dislocation density, which is estimated to mainly cause the paradox low strength.

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Deformation and annealing behaviors of high-entropy alloy Al0.5CoCrCuFeNi

Cited by 268 publications

References 15 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

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

Anomalous Evolution of Strength and Microstructure of High‐Entropy Alloy CoCrFeNiMn after High‐Pressure Torsion at 300 and 77 K

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