Atomic packing efficiency and phase transition in a high entropy alloy

Wang, F.J.; Zhang, Yong; Chen, G.L.

doi:10.1016/j.jallcom.2008.11.059

Cited by 165 publications

(44 citation statements)

References 7 publications

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“…6 They claimed that the alloying of larger Al atoms introduces the lattice distortion energy, and the formation of a lower atomic-packing-efficiency structure, such as bcc, can decrease this distortion energy. This does make sense but is far away from being satisfactory; besides, it can not quantitatively predict when the bcc structure will form as a function of Al additions.…”

Section: Discussionmentioning

confidence: 99%

Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys

Guo

et al. 2011

Journal of Applied Physics

1,948

676

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Hydrogen quantum effects in hydride LaNi5H7J. Appl. Phys. 110, 063533 (2011) Accurate determination of the Gibbs energy of Cu-Zr melts using the thermodynamic integration method in Monte Carlo simulations J. Chem. Phys. 135, 084502 (2011) Efficient calculation of -and -nitrogen free energies and coexistence conditions via overlap sampling with targeted perturbation J. Chem. Phys. 135, 044125 (2011) An incremental mean first passage analysis for a quasistatic model of polymer translocation through a nanopore J. Chem. Phys. 134, 154905 (2011) The effect of pressure on the phase transition behavior of tridecane, pentadecane, and heptadecane: A Fourier transform infrared spectroscopy study J. Chem. Phys. 134, 144503 (2011) Additional information on J. Appl. Phys. Phase stability is an important topic for high entropy alloys (HEAs), but the understanding to it is very limited. The capability to predict phase stability from fundamental properties of constituent elements would benefit the alloy design greatly. The relationship between phase stability and physicochemical/thermodynamic properties of alloying components in HEAs was studied systematically. The mixing enthalpy is found to be the key factor controlling the formation of solid solutions or compounds. The stability of fcc and bcc solid solutions is well delineated by the valance electron concentration (VEC). The revealing of the effect of the VEC on the phase stability is vitally important for alloy design and for controlling the mechanical behavior of HEAs.

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Section: Discussionmentioning

confidence: 99%

Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys

Guo

et al. 2011

Journal of Applied Physics

1,948

676

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“…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

736

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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“…They show high strength and excellent wear resistance at low and high temperatures, which make them of great interest for many industrial applications [3][4][5][6][7][8]. Yield strength and hardness in HEAs can display values in excess of 2000 MPa [9,10] and 800 Hv [11], respectively. This high strength, usually at the expense of ductility, can be preserved even at high temperatures [5,12,13].…”

Section: Introductionmentioning

confidence: 99%