Microstructure characterization of AlxCo1Cr1Cu1Fe1Ni1 (x=0 and 2.5) high-entropy alloy films

Wu, Zhe; Wang, X.D.; Cao, Q.P.; Zhao, Guangfeng; Li, J.X.; Zhang, D.X.; Zhu, Jian-Jun; Jiang, J.Z.

doi:10.1016/j.jallcom.2014.04.094

Cited by 86 publications

(37 citation statements)

References 18 publications

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“…Furthermore, an alloy produced by mechanical alloying was found after 15 h of milling to contain a minority bcc phase together with a main fcc phase [20]. In alloy lms only a fcc structure was detected at ambient temperature [21]. The different results are most probably due to dierent sample preparation techniques and alloy grain size distributions.…”

Section: Tablementioning

confidence: 99%

Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction

et al. 2015

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The understanding of the structure and the stability of high entropy alloys is still incomplete and the mechanisms behind the composition-property relationships are unclear. One reason is that few systematic and accurate determinations of their composition-dependent structure on atomic level have been made. In this paper some results on the structure obtained by X-ray and neutron diraction of the CoCrFeNi alloy, to which Pd, Sn and Cu have been added in dierent amounts, are reported. The investigations make it obvious that none of the alloys is completely homogeneous, as has earlier been suggested, and that they do not form a perfect solid solution.

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Section: Tablementioning

confidence: 99%

Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction

et al. 2015

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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

742

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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“…[20][21][22] Due to the unique properties of HEAs, it would be very promising to employ HEAs as a thin-film material. Amongst the reported HEA thin-film work, [23][24][25][26][27] Huang et al [24] reported the sputter deposition of an amorphous phase of an AlCrCoCu 0.5 FeNi film. Dolique et al [25] deposited crystalline films and determined that the microstructure of the film was dependent on the operating power of the sputtering target.…”

mentioning

confidence: 99%

Solid-Solution CrCoCuFeNi High-Entropy Alloy Thin Films Synthesized by Sputter Deposition

Jia

et al. 2015

Materials Research Letters

143

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Microstructure characterization of AlxCo1Cr1Cu1Fe1Ni1 (x=0 and 2.5) high-entropy alloy films

Cited by 86 publications

References 18 publications

Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction

Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction

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

Solid-Solution CrCoCuFeNi High-Entropy Alloy Thin Films Synthesized by Sputter Deposition

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