Characterization of the microstructure of the compositionally complex alloy Al1Mo0.5Nb1Ta0.5Ti1Zr1

Jensen, J.K.; Welk, Brian; Williams, Robert E.A.; Sosa, J.M.; Huber, Daniel; Senkov, O.N.; Viswanathan, G.B.; Fraser, Hamish L.

doi:10.1016/j.scriptamat.2016.04.017

Cited by 125 publications

(49 citation statements)

References 13 publications

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“…In another example, it has been shown that not only are CCA microstructures unique, but the extensive segregation of alloying elements can occur. 5 This extensive segregation of alloying elements is shown in Fig. 1b for the AlMo 0.5 NbTa 0.5 TiZr system.…”

Section: Introductionmentioning

confidence: 77%

“…However, the pitting potential (E pit ) of Cu 0. 5 NiAlCoCrFeSi was found to be lower (less noble) than that of 304SS in a Cl − environment, and it was thus purported that the HEA had lower resistance to pitting than 304 SS. 17 The study however did not outline any of the mechanistic aspects pertaining to the corrosion of HEAs, while it is now also more widely appreciated in the corrosion community that the pitting potential is not the best indication of pitting susceptibility, offering little insight into the number and size of pits that evolve.…”

Section: Aqueous Corrosion Of Heasmentioning

confidence: 99%

“…Continued research has however highlighted that numerous socalled HEAs, such as the Mo 0.5 AlNbTa 0.5 TiZr system, did not have high configurational entropies and present the formation of secondary phases (rather than just solid solution phases). Therefore, a more general description of such alloy systems has emerged, with the more general naming and definition being compositionally complex alloys (CCAs), 4,5 which is the preferred naming used throughout this review.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

378

133

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High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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Section: Introductionmentioning

confidence: 77%

Section: Aqueous Corrosion Of Heasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

378

133

View full text Add to dashboard Cite

show abstract

“…Especially if the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [29,[31][32][33][34][35][36][37][38]. Generally speaking, a smaller …”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

132

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Abstract:The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al x NiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the Al x NiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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“…Especially, the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [28,[30][31][32][33][34][35][36][37]. Generally speaking, a smaller lattice misfit, ε, leads to a spherical shape, and when the misfit becomes larger, it is difficult to control the morphology of the precipitates, and the coherency between them will disappear gradually, resulting in coarse second particles finally.…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Ma¹,

Jiang²,

Li³

et al. 2017

Preprint

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Abstract:The present work investigates primarily the morphology evolution of the body-centeredcubic (BCC)/B2 phases in AlxNiCoFeCr high-entropy alloys (HEAs) with increasing Al content, which has been neglected so far. There exist two types of microscopic morphologies of BCC and B2 phases in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The shape of coherent precipitates is found to be closely related to the lattice misfit between BCC and B2 phases, which is sensitive to Al. The mechanical properties, including the compressive yielding strength and microhardness of the AlxNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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Characterization of the microstructure of the compositionally complex alloy Al1Mo0.5Nb1Ta0.5Ti1Zr1

Cited by 125 publications

References 13 publications

Corrosion of high entropy alloys

Corrosion of high entropy alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

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