Phase Diagrams of High-Entropy Alloy System Al-Co-Cr-Fe-Mo-Ni

Hsu, Chiou-Ting; Juan, Chien-Chang; Chen, Shin-Tsung; Sheu, Tsing-Shien; Chen, Swe-Kai

doi:10.1007/s11837-013-0773-2

Cited by 31 publications

(9 citation statements)

References 18 publications

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“…Phase diagrams would be beneficial in guiding aging treatments (and selection of aging temperatures). To date, it has been demonstrated that phase diagrams for CCAs may be produced by first principles modelling coupled with CALPHAD, 4,[74][75][76] and this is likely to be a fruitful area of future work.…”

Section: The Influence Of Processing Methods On the Corrosion Of Ccasmentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

381

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: The Influence Of Processing Methods On the Corrosion Of Ccasmentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

381

133

View full text Add to dashboard Cite

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“…Their selection and investigation have been done more or less by trial and error [10] since phase diagrams for such multi-component systems are not known. So far, partial vertical cross-sections of phase diagrams have been experimentally studied for the systems Cr-Fe-Co-Ni-Al-Cu [11], Cr-Fe-Co-Ni-Al-Mo [12], Cr-Fe-Co-Ni-Al-Nb [13], and Cr-Fe-Co-Ni-Cu-Ti [14] (note that many authors refer to a mixture of several fcc or bcc and cP2-CsCl type phases as fcc or bcc solid solutions) and simulated by the CALPHAD method for Cr-Fe-Co-Ni-Al [10], Cr-Fe-Co-Ni-Mn [15], and Cr-Nb-Ti-V-Zr [15], which are in agreement with experimental observations of [7,16], and [17], respectively. Some new single-phase HEAs such as fcc (CoFeMnNi, CuNiPdPt, CuNiPdPtRh) and hcp (CoOsReRu) have been calculated [18].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Single-phase high-entropy alloys – an overview

Kozak

Sologubenko

Steurer

2014

Zeitschrift Für Kristallographie - Crystalline Materials

135

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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.

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“…The competing phases in the solid state are equally important, and thus the phase relationships (namely phase diagrams) need to be determined. Unfortunately, there is very limited phase diagram information available on HEAs and only from recent studies [4,29]. Although various commercial databases have developed via the CALPHAD method since 1970s, database development targeted for HEAs is also limited to the study by Zhang et al [30] and Senkov et al [31].…”

Section: Calphad Calculationsmentioning

confidence: 99%

Searching for Next Single-Phase High-Entropy Alloy Compositions

Gao

Alman

2013

Entropy

274

111

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There has been considerable technological interest in high-entropy alloys (HEAs) since the initial publications on the topic appeared in 2004. However, only several of the alloys investigated are truly single-phase solid solution compositions. These include the FCC alloys CoCrFeNi and CoCrFeMnNi based on 3d transition metals elements and BCC alloys NbMoTaW, NbMoTaVW, and HfNbTaTiZr based on refractory metals. The search for new single-phase HEAs compositions has been hindered by a lack of an effective scientific strategy for alloy design. This report shows that the chemical interactions and atomic diffusivities predicted from ab initio molecular dynamics simulations which are closely related to primary crystallization during solidification can be used to assist in identifying single phase high-entropy solid solution compositions. Further, combining these simulations with phase diagram calculations via the CALPHAD method and inspection of existing phase diagrams is an effective strategy to accelerate the discovery of new single-phase HEAs. This methodology was used to predict new singlephase HEA compositions. These are FCC alloys comprised of CoFeMnNi, CuNiPdPt and CuNiPdPtRh, and HCP alloys of CoOsReRu.

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Phase Diagrams of High-Entropy Alloy System Al-Co-Cr-Fe-Mo-Ni

Cited by 31 publications

References 18 publications

Corrosion of high entropy alloys

Corrosion of high entropy alloys

Single-phase high-entropy alloys – an overview

Searching for Next Single-Phase High-Entropy Alloy Compositions

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