Microstructure of a near-equimolar refractory high-entropy alloy

Couzinié, Jean-Philippe; Dirras, G.; Perrière, Loïc; Chauveau, Thierry; Leroy, Éric; Champion, Yannick; Guillot, Ivan

doi:10.1016/j.matlet.2014.04.062

Cited by 148 publications

(66 citation statements)

References 12 publications

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“…Dendritic morphology was also observed in refractory body-centered HEA. Indeed, dendrites enriched in Nb and Ta were observed in TiZrHfNbTa [14] while dendrites enriched in W were detected in NbMoTaVW [13]. In both cases, the elements which are segregating within the dendrites are the ones with the highest melting point.…”

Section: Discussionmentioning

confidence: 99%

“…The TiV x Cr y ZrNb system can contain a bcc phase with submicrometric precipitates or three bcc phases or a bcc phase and Laves phase, depending on the composition [12]. On the contrary, the refractory alloys NbMoTaW, VNbMoTaW [13] and TiZrNbHfTa [14] are composed of a single bcc phase while the refractory alloy Ti 35 Zr 27.5 Nb 5 Hf 27.5 Ta 5 has a peculiar single orthorhombic phase [15]. The Al x CrFeNi 2 Cu for x < 0.8 [16] and CrMnFeCoNi [5] alloys exhibit a single face centered cubic phase.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the phase diagram of the CrMnFeCoNi high entropy alloy

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into the phase diagram of the CrMnFeCoNi high entropy alloy

et al. 2015

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“…1,2,5,15,16 Perhaps only the introduction of HEAs based on refractory metals, 29,[118][119][120]156,158,163,164,281,287,[291][292][293][294][295][296][297][298][299][300][301] instigated by Senkov, Miracle et al 27,28,302 have provided a notable step change in this respect. The alloying screening methods discussed above are not limited in terms of potential alloying elements, and are hence to be viewed favourably in this respect.…”

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

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

Pickering

Jones

2016

International Materials Reviews

707

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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“…A detailed characterization for the as-cast microstructure of this refractory alloy has been given elsewhere [28]. Figure 1 is a typical inverse pole figure of the initial microstructure.…”

Section: As-cast Microstructurementioning

confidence: 99%