Effects of Al and Si addition on the structure and properties of CoFeNi equal atomic ratio alloy

Zuo, Tingting; Li, Ruqing; Ren, Xuejun; Zhang, Yong

doi:10.1016/j.jmmm.2014.07.023

Cited by 228 publications

(56 citation statements)

References 22 publications

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“…It is seen that the d c representing GFA show a better correlation with DT x and S parameters than T rg and/or g. 25 alloy series is the first soft magnetic metallic glass system developed based on the high entropy alloy composition rule. Here, it should be noted that ferromagnetic FeCoNiAl and FeCoNi(AlSi) 0.2 HEAs with good mechanical properties can be produced by arc-and inductionmelting [3,20], but the HEAs are not HE-BMGs. The H c of the present HE-BMGs are much lower than those of the ferromagnetic HEAs (see Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…To be exact, the HEAs were defined as the alloys with equi-atomicity comprising five or more elements, but the recent researches allow to contain those consisting of five or more principal elements in equal or near equal atomic percent (at.%) ranging 5 to 35 at%. Furthermore, very recent work indicated that the HEAs can be extended even to a quaternary alloy system, such as a Fe 25 Co 25-Ni 25 Al 25 HEA with face-centered cubic (fcc) structure [3]. The HEAs exhibit excellent properties such as high strength, high hardness, good wear resistance, and high thermal stability, which show great potential for practical applications [2e8].…”

Section: Introductionmentioning

confidence: 99%

“…Here, d is the critical parameter which determines the formation of solid solution phases or BMGs [10]. Table 1 [3] and its derivative FeCoNi(AlSi) 0.2 [20] HEAs with fcc structure are also shown for comparison. It is seen that the formation of HE-BMGs requires a larger atomic size difference (d > 9), combined with higher negative heat of mixing, and mixing entropy, as compared to the fcc and/or bcc HEAs [9,10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Soft magnetic Fe25Co25Ni25(B, Si)25 high entropy bulk metallic glasses

Takeuchi

et al. 2015

Intermetallics

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft magnetic Fe25Co25Ni25(B, Si)25 high entropy bulk metallic glasses

Takeuchi

et al. 2015

Intermetallics

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“…All of these exceptions include Al within their mixtures and also display Hmax values of the same magnitude as the intermetallic/multiphase systems screened ( Figure 5). It has been reported that HEAs with Al can exist in the form of partially ordered BCC alloys, the nature of which might not be evident through standard experimental analysis [53,54]. We now investigate this drive for ordering, on the atomic scale, for one of the exceptions, AlCoFeNi, using DFT.…”

Section: Exceptions To the Modelmentioning

confidence: 94%

Predicting the formation and stability of single phase high-entropy alloys

King

Middleburgh

McGregor³

et al. 2016

Acta Materialia

317

120

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Abstract:A method for rapidly predicting the formation and stability of undiscovered single phase high-entropy alloys (SPHEAs) is provided. Our software implementation of the algorithm uses data for 73 metallic elements and rapidly combines them -4, 5 or 6 elements at a time -using the Miedema semi-empirical methodology to yield estimates of formation enthalpy. Approximately 186,000,000 compositions of 4, 5 and 6 element alloys were screened, and ~1,900 new equimolar SPHEAs predicted. Of the 185 experimentally reported HEA systems currently known, the model correctly predicted the stability of the SPHEA structure in 177. The other sixteen were suggested to actually form a partially ordered solid solution -a finding supported by other recent experimental and theoretical work. The stability of each alloy at a specific temperature can also be predicted, allowing precipitation temperatures (and the likely precipitate) to be forecast. This combinatorial algorithm is described in detail, and its software implementation is freely accessible through a webservice allowing rapid advances in the design, development and discovery of new technologically important alloys. , and re-iterated by others since then [1,12], defines a HEA as any alloy consisting of 5 or more elements between 5 -35 at. %. As such, this type of HEA will usually possess a microstructure consisting of two or more distinct phases, some of which are likely to be brittle intermetallic compounds. Although, multiphase strengthening is sometimes desirable in alloys, a large amount of any brittle phase will generally make an alloy unusable as a structural material and such HEAs are therefore mundane. However, as will be discussed shortly, in a few special cases, the additional entropy of the multi-element composition will stabilise a microstructure consisting of either (i) a single solid solution having one of the simple close-packed crystal structures (FCC, HCP or BCC) or (ii) a duplex microstructure consisting of two such simple solid solutions. Generally, it is these non-trivial examples of HEA that interest investigators.This is because the resulting random solid solution(s) will exhibit a combination of ductility coupled with significant solid solution hardening. We recommend use of the term single 2 phase high-entropy alloy (SPHEA) as a more restrictive term to differentiate the rare and desirable single phase type of HEA from generic examples of multiphase HEAs.Combining Yeh's compositional limits [7] with the requirement for a single phase solid solution, we can define a SPHEA as an alloy with  4 alloying elements, at least 4 of which with a molar ratio between 0.33 -1 to that of the highest contributing element. These alloys must be able to display a single phase of simple, random, close-packed structure below the solidus.We return now to the factors that might stabilise a SPHEA. The prevailing hypotheses were (i) that the simple crystal structure or structures are thermodynamically stabilised, relative to possible intermetallic compounds, by the inc...

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“…The NiCoFeCrAl x fall into the same resistivity range with those Cr-containing alloys. The NiCoFe-based alloys containing other alloying elements, e.g., Ti, and Si, have been observed to reach higher electrical resistivity only when significant amounts of intermetallics phases are formed (Zhang and Fu, 2012;Zuo et al, 2014), which is beyond the scope of SP-CSAs.…”

Section: Electrical and Thermal Transport Properties Electrical Resismentioning

confidence: 99%

Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

Jin

Bei

2018

Front. Mater.

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Single-phase concentrated solid-solution alloys (SP-CSAs), including high entropy alloys (HEAs), are compositionally complex but structurally simple, and provide a playground of tailoring material properties through modifying their compositional complexity. The recent progress in understanding the compositional effects on the energy and mass transport properties in a series of face-centered-cubic SP-CSAs is the focus of this review. Relatively low electrical and thermal conductivities, as well as small separations between the interstitial and vacancy migration barriers have been generally observed, but largely depend on the alloying constituents. We further discuss the impact of such intrinsic transport properties on their irradiation response; the linkage to the delayed damage accumulation, slow defect aggregation, and suppressed irradiation induced swelling and segregation has been presented. We emphasize that the number of alloying elements may not be a critical factor on both transport properties and the defect behaviors under ion irradiations. The recent findings have stimulated novel concepts in the design of new radiation-tolerant materials, but further studies are demanded to enable predictive models that can quantitatively bridge the transport properties to the radiation damage.

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Effects of Al and Si addition on the structure and properties of CoFeNi equal atomic ratio alloy

Cited by 228 publications

References 22 publications

Soft magnetic Fe25Co25Ni25(B, Si)25 high entropy bulk metallic glasses

Soft magnetic Fe25Co25Ni25(B, Si)25 high entropy bulk metallic glasses

Predicting the formation and stability of single phase high-entropy alloys

Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

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