Glass formation in a high entropy alloy system by design

Cunliffe, Andrew; Plummer, John; Figueroa, I.A.; Todd, Iain

doi:10.1016/j.intermet.2011.12.006

Cited by 64 publications

(58 citation statements)

References 23 publications

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“…By utilizing thermodynamic and numerical quantaties, such as H mix , S config and , the stabilities of crystalline H-E alloys with disordered solid solutions have been analyzed in such a set of formulae of ΔS config R > 1.61, δ < 4.6, and -2.6856δ -2.54 < H mix /kJmol −1 < −1.28δ + 5.44, as reported by Zhang and Zhou [11]. These numerical applicability with thermodynamic and numerical quantaties for forming H-E alloys are of great useful for alloy design of H-E alloys, together with the other precious analyses given by Ng et al [13] for an Al 0.5 CoCrCuFeNi H-E alloy for its thermo-mechanical treatments combined with thermodynamic calculations, and by Cunliffe et al [14] for their discussions of forming-abilities of H-E alloys and amorphous phase for a (TiZrNbCu) 1−x Ni x system. Thus, the authors herewith focus on an inportant aspect that the H-E alloys and BMGs are sufficiently described by numerical and thermodynamic quantaties in their alloy designs.…”

Section: Introductionsupporting

confidence: 58%

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Takeuchi

Amiya

Wada

et al. 2013

Entropy

110

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High-entropy (H-E) alloys, bulk metallic glasses (BMGs) and high-entropy BMGs (HE-BMGs) were statistically analyzed with the help of a database of ternary amorphous alloys. Thermodynamic quantities corresponding to heat of mixing and atomic size differences were calculated as a function of composition of the multicomponent alloys. Actual calculations were performed for configurational entropy (S config. ) in defining the H-E alloys and mismatch entropy (S  ) normalized with Boltzmann constant (k B ), together with mixing enthalpy (H mix ) based on Miedema's empirical model and Delta parameter () as a corresponding parameter to S  /k B . The comparison between H mix - and H mix -σ B S k diagrams for the ternary amorphous alloys revealed S  /k B ~ ( /22) 2 . The zones S, S′ and B's where H-E alloys with disordered solid solutions, ordered alloys and BMGs are plotted in the H mix - diagram are correlated with the areas in the H mix -S  /k B diagram. The results provide mutual understandings among H-E alloys, BMGs and HE-BMGs.

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Section: Introductionsupporting

confidence: 58%

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Takeuchi

Amiya

Wada

et al. 2013

Entropy

110

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“…These conditions are in line with the empirical rules for BMG formation [64]. The number of reported high entropy BMGs is still not large [67][68][69][70][71][72][73][74][75]. Some of the reported alloys do have larger critical diameters.…”

Section: High-entropy Bulk Metallic Glass (Hebmg)supporting

confidence: 82%

Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.

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“…The CCFN, CCFNPd x (x = 0.5, 1.0, 1.5) and CCFN Sn alloys were prepared as presented elsewhere [2] from 99.9wt.% pure raw materials. Cylindrical rods were prepared by copper-mould suction casting into a watercooled Cu hearth.…”

Section: Sample Preparation and Experimental Techniquesmentioning

confidence: 99%

Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pd_x(x=0.5, 1.0, 1.5) and CoCrFeNi-Sn

et al. 2015

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The structure of a family of high entropy alloys based on the composition CoCrFeNi, to which Pd and Sn have been added, is presented. The results stem from combined investigations by atom probe tomography as well as by scanning and transmission electron microscopy on samples produced by arc melting. Although CoCrFeNi is of fcc structure, the sample is not homogeneous on atomic scale. The addition of Pd as a fth element retains the fcc lattice with the indication of the coexistence of at least two additional phases. The addition of Sn changes the general structure considerably.

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Glass formation in a high entropy alloy system by design

Cited by 64 publications

References 23 publications

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pd_x(x=0.5, 1.0, 1.5) and CoCrFeNi-Sn

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Glass formation in a high entropy alloy system by design

Cited by 64 publications

References 23 publications

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pdx(x=0.5, 1.0, 1.5) and CoCrFeNi-Sn

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Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pd_x(x=0.5, 1.0, 1.5) and CoCrFeNi-Sn