Determination of the transition to the high entropy regime for alloys of refractory elements

Grosso, M.F. del; Bozzolo, Guillermo; Mosca, H.O.

doi:10.1016/j.jallcom.2012.04.053

Cited by 47 publications

(21 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We first notice that the B2 phase is lower in energy at zero K, compared to the A2 solid solution. This is consistent with the B2 ordering at ambient temperatures found in previous works [10][11][12][13][14][15]. Considering the impact of atomic relaxations, we find that the A2 total energy is lowered by ≈ 12 meV per atom (difference between red line/circles and black line/squares in Figure 1c) whereas there is only very little impact of atomic relaxations on the B2 total energy (< 1 meV) shown in Figure 1f.…”

Section: Resultssupporting

confidence: 91%

“…However, thermodynamic equilibrium at experimental conditions is limited due to slow diffusion inherent in refractory alloys. Recent theoretical works have reported a B2 ordering between mixed (Mo,W) and (Nb,Ta) sites at ambient temperatures [10][11][12][13][14]. A recent first-principles study combining chemical interactions from the generalized perturbation method with Monte Carlo simulations revealed an ordering temperature of about 750 K [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interplay between Lattice Distortions, Vibrations and Phase Stability in NbMoTaW High Entropy Alloys

Körmann

Sluiter

2016

Entropy

View full text Add to dashboard Cite

Refractory high entropy alloys (HEA), such as BCC NbMoTaW, represent a promising materials class for next-generation high-temperature applications, due to their extraordinary mechanical properties. A characteristic feature of HEAs is the formation of single-phase solid solutions.For BCC NbMoTaW, recent computational studies revealed, however, a B2(Mo,W;Nb,Ta)-ordering at ambient temperature. This ordering could impact many materials properties, such as thermodynamic, mechanical, or diffusion properties, and hence be of relevance for practical applications. In this work, we theoretically address how the B2-ordering impacts thermodynamic properties of BCC NbMoTaW and how the predicted ordering temperature itself is affected by vibrations, electronic excitations, lattice distortions, and relaxation energies.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Interplay between Lattice Distortions, Vibrations and Phase Stability in NbMoTaW High Entropy Alloys

Körmann

Sluiter

2016

Entropy

View full text Add to dashboard Cite

show abstract

“…[7][8][9][10][11][12][13] Here we demonstrate this effect with Figure 1, which shows the XRD patterns of a series of binary to septenary alloys. It is seen that the phases Figure 1.…”

Section: High-entropy Effectsupporting

confidence: 62%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,622

853

View full text Add to dashboard Cite

High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

show abstract

“…Thermodynamic calculations in [7] and [15] support the conclusion that trends observed in the binary systems are also seen in multicomponent alloys. Another approach, based on the Bozzolo-FerranteSmith method for alloys, was discussed in [94]. The concept of critical concentrations for each element (limits of solubility) was proposed as an indicator of single-phase HEA formation.…”

Section: Systems Of Transition Metals Onlymentioning

confidence: 99%

Single-phase high-entropy alloys – an overview

Kozak

Sologubenko

Steurer

2014

Zeitschrift Für Kristallographie - Crystalline Materials

136

View full text Add to dashboard Cite

Abstract:The term "high-entropy alloys (HEAs)" first appeared about 10 years ago defining alloys composed of n = 5-13 principal elements with concentrations of approximately 100/n at.% each. Since then many equiatomic (or near equiatomic) single-and multi-phase multicomponent alloys were developed, which are reported for a combination of tunable properties: high hardness, strength and ductility, oxidation and wear resistance, magnetism, etc. In our paper, we focus on probably single-phase HEAs (solid solutions) out of all HEAs studied so far, discuss ways of their prediction, mechanical properties. In contrast to classical multielement/multiphase alloys, only single-phase multielement alloys (solid solutions) represent the basic concept underlying HEAs as mixing-entropy stabilized homogenous materials. The literature overview is complemented by own studies demonstrating that the alloys CrFeCoNi, CrFeCoNiAl 0.3 and PdFeCoNi homogenized at 1300 and 1100°C, respectively, for 1 week are not singlephase HEAs, but a coherent mixture of two solid solutions.

show abstract

Determination of the transition to the high entropy regime for alloys of refractory elements

Cited by 47 publications

References 44 publications

Interplay between Lattice Distortions, Vibrations and Phase Stability in NbMoTaW High Entropy Alloys

Interplay between Lattice Distortions, Vibrations and Phase Stability in NbMoTaW High Entropy Alloys

High-Entropy Alloys: A Critical Review

Single-phase high-entropy alloys – an overview

Contact Info

Product

Resources

About