Mechanical performance of the Al
                x
              CoCrCuFeNi high-entropy alloy system with multiprincipal elements

Tong, C. H.; Chen, Min-Rui; Yeh, Jien‐Wei; Lin, Su-Jien; Chen, Swe-Kai; Shun, Tao-Tsung; Chang, Shou-Yi

doi:10.1007/s11661-005-0218-9

Cited by 771 publications

(285 citation statements)

References 22 publications

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“…[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%

“…Of all the HEA systems reported, Al-Co-Cr-Cu-Fe-Ni [7,8,21,35,36,49,[60][61][62][63][64][65][66][67][68] and its Cu-free version Al-Co-Cr-Fe-Ni [69][70][71][72][73][74] have been studied most comprehensively. Most of the reported HEA systems emerge from them.…”

Section: Thementioning

confidence: 99%

“…In general, hardness of the FCC phase is between HV 100-200. [7,8,[70][71][72] Alloys having a sole FCC phase have ductilities between 20-60%, and usually exhibit significant work hardening. [62,63,69] Hardness of the BCC/B2 phase is typically between HV 500-600.…”

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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2,630

853

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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.

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“…[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%

Section: Thementioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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853

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“…Pt-Al was chosen as it presents a large range of intermetallic compounds all of which having a wealth of experimental and theoretical data. Mo-Nb-Ti-V0.25 was chosen as it represents a system that is devoid of intermetallic compounds, save for a metastable NbTi4 phase [39].…”

Section: Benchmarking To Experimental Literaturementioning

confidence: 99%

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

King

Middleburgh

McGregor³

et al. 2016

Acta Materialia

344

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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“…This suggests that the formation of a BCC type structure is a dominant factor of hardening, and the increase of the relative amount of BCC phase leads to a large increase in hardness. The larger atomic radius, the transformation of the crystal structure and dispersion of nanocrystallite could be responsible for the increased hardness of the alloys [18]. The microhardness of the HEA coatings in this work can reach 667.3 to 801.1 HV, which is at least 1.8 times that of 00Cr16Ni5Mo alloy (370.5 HV).…”

Section: Microstructure and Xrd Analysismentioning

confidence: 68%

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

Zhao

et al. 2018

Metals

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High-entropy alloys (HEAs) have gained extensive attention due to their excellent properties and the related scientific value in the last decade. In this work, Al x CoCrFeNiTi 0.5 HEA coatings (x: molar ratio, x = 1.0, 1.5, 2.0, and 2.5) were fabricated on Q345 steel substrate by laser-cladding process to develop a practical protection technology for fluid machines. The effect of Al content on their phase evolution, microstructure, and slurry erosion performance of the HEA coatings was studied. The Al x CoCrFeNiTi 0.5 HEA coatings are composed of simple face-centered cubic (FCC), body-centered cubic (BCC) and their mixture phase. Slurry erosion tests were conducted on the HEA coatings with a constant velocity of 10.08 m/s and 16-40 meshs and particles at impingement angles of 15, 30, 45, 60 and 90 degrees. The effect of three parameters, namely impingement angle, sand concentration and erosion time, on the slurry erosion behavior of Al x CoCrFeNiTi 0.5 HEA coatings was investigated. Experimental results show AlCoCrFeNiTi 0.5 HEA coating follows a ductile erosion mode and a mixed mode (neither ductile nor brittle) for Al 1.5 CoCrFeNiTi 0.5 HEA coating, while Al 2.0 CoCrFeNiTi 0.5 and Al 2.5 CoCrFeNiTi 0.5 HEA coatings mainly exhibit brittle erosion mode. AlCoCrFeNiTi 0.5 HEA coating has good erosion resistance at all investigated impingement angles due to its high hardness, good plasticity, and low stacking fault energy (SFE).

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Mechanical performance of the Al x CoCrCuFeNi high-entropy alloy system with multiprincipal elements

Cited by 771 publications

References 22 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

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

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

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