Structure and mechanical properties of a light-weight AlNbTiV high entropy alloy

Stepanov, Nikita; Shaysultanov, D.G.; Салищев, Г. А.; Tikhonovsky, М.А.

doi:10.1016/j.matlet.2014.11.162

Cited by 350 publications

(141 citation statements)

References 16 publications

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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

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: 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

703

299

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“…In spite of the compositional complexity, the number of phases observed in these alloys does not generally exceed two or three, with the BCC solid-solution typically being the primary phase. RHEAs with a low density and high strength are among the most promising recent achievements in this field [19][20][21][22][23]. In particular, the density of these new alloys is in the range of 5.9 to 8.4 g/cm 3 and their specific strengths are often superior to Ni-based superalloys [19,23].…”

Section: Introductionmentioning

confidence: 99%

Development of a Refractory High Entropy Superalloy

Senkov

Isheim

Seidman

et al. 2016

Entropy

235

101

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Microstructure, phase composition and mechanical properties of a refractory high entropy superalloy, AlMo 0.5 NbTa 0.5 TiZr, are reported in this work. The alloy consists of a nano-scale mixture of two phases produced by the decomposition from a high temperature body-centered cubic (BCC) phase. The first phase is present in the form of cuboidal-shaped nano-precipitates aligned in rows along <100>-type directions, has a disordered BCC crystal structure with the lattice parameter a 1 = 326.9˘0.5 pm and is rich in Mo, Nb and Ta. The second phase is present in the form of channels between the cuboidal nano-precipitates, has an ordered B2 crystal structure with the lattice parameter a 2 = 330.4˘0.5 pm and is rich in Al, Ti and Zr. Both phases are coherent and have the same crystallographic orientation within the former grains. The formation of this modulated nano-phase structure is discussed in the framework of nucleation-and-growth and spinodal decomposition mechanisms. The yield strength of this refractory high entropy superalloy is superior to the yield strength of Ni-based superalloys in the temperature range of 20˝C to 1200˝C.

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“…e characteristics of the river pattern and tear ridge shown in Figures 6(a) to 6(d) indicate a quasicleavage fracture in all alloys during compression, which accounts for the small difference in ductility of the four alloys. As shown in Table 2, σ max and ε f of alloys Cr-0.3 to Cr-1.0 are better than those of other high-entropy alloys and bulk amorphous alloys [18,[26][27][28][29][30]. ese properties indicate the potential use of this alloy system in the development of structural materials with high strength and high ductility.…”

Section: 3mentioning

confidence: 87%

Effects of Cr Content on Microstructure and Mechanical Properties of AlCoCr_xFeNi High‐Entropy Alloy

Shun

Hung

2018

Advances in Materials Science and Engineering

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In this study, we investigated the effects of Cr content on the crystal structure, microstructure, and mechanical properties of four AlCoCr x FeNi (x � 0.3, 0.5, 0.7, and 1.0, in molar ratio) high-entropy alloys. AlCoCr 0.3 FeNi alloy contains duplex phases, which are ordered BCC phase and FCC phase. As the Cr content increases to x � 1.0, the FCC phase disappears and the microstructure exhibits a spinodal structure formed by a BCC phase and an ordered BCC phase. is result indicates that Cr is a BCC former in AlCoCr x FeNi alloys. With increasing Cr content, the alloy hardness increases from HV415 to HV498. AlCoCr 0.3 FeNi, AlCoCr 0.5 FeNi, and AlCoCr 0.7 FeNi exhibit a high compressive fracture strain of about 0.24 because of the formation of the FCC phase in the BCC matrix. Moreover, the highest yield stress of 1394 MPa and compressive strength of 1841 MPa presented by AlCoCrFeNi alloy are due to the existence of a nano-net-like spinodal structure.

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Structure and mechanical properties of a light-weight AlNbTiV high entropy alloy

Cited by 350 publications

References 16 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

Development of a Refractory High Entropy Superalloy

Effects of Cr Content on Microstructure and Mechanical Properties of AlCoCr_xFeNi High‐Entropy Alloy

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Structure and mechanical properties of a light-weight AlNbTiV high entropy alloy

Cited by 350 publications

References 16 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

Development of a Refractory High Entropy Superalloy

Effects of Cr Content on Microstructure and Mechanical Properties of AlCoCrxFeNi High‐Entropy Alloy

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Effects of Cr Content on Microstructure and Mechanical Properties of AlCoCr_xFeNi High‐Entropy Alloy