Competition between elements during mechanical alloying in an octonary multi-principal-element alloy system

Chen, Yuliang; Hu, Ya-Huei; Hsieh, Cheng-An; Yeh, Jien‐Wei; Chen, Swe-Kai

doi:10.1016/j.jallcom.2009.03.087

Cited by 218 publications

(58 citation statements)

References 30 publications

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“…Among these researches, it has been noted that HEAs prepared by melting method tend to form simple BCC and/or FCC solid solution phases due to high entropy effect and might possess a range of promising properties. However, for the HEA systems prepared by MA, such as Al-Fe-Ti-Cr-Zn-Cu [ Cu-Ni-Al-Co-Cr-Fe-Ti-Mo [27,28], Co-Cr-Fe-Ni-Cu-Al [29], and Cu-Ni-Co-Zn-Al-Ti [30], the tendency is different. Although they contain a variety of BCC, FCC, and HCP elements and first form simple BCC and/or FCC crystalline solid solution phases due to high entropy effect, prolonged milling causes these solid solution phases to transform into amorphous phase similar to the feature of type I amorphization.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, various topics on HEAs have been reported, including microstructure and mechanical properties [12][13][14], effects of adding more elements [15,16], thermal stability [17][18][19], wear and corrosion resistance [20,21], hard coating [22,23], barrier films [24,25] and mechanical alloying behavior [26][27][28][29][30]. These are helpful in understanding HEAs in both academic and application aspects.…”

Section: Introductionmentioning

confidence: 99%

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Amorphization of equimolar alloys with HCP elements during mechanical alloying

Chen

Tsai

Juan

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Amorphization of equimolar alloys with HCP elements during mechanical alloying

Chen

Tsai

Juan

et al. 2010

Journal of Alloys and Compounds

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“…A HEA was originally defined as an alloy composed of at least five principal metallic elements, each ranging from 5 to 35 at.% [5]. In the past decade, many high-entropy alloy systems composed of five to nine metal elements e.g., Al x CoCrCuFeNi [6e10], Al x CoCrFeNiTi [11], Ti x CoCrCuFeNi [12], CoCrMnNiFe [13], CuNiAlCoCrFeTiMo [14,15], AlCoCrCuFeNiSi [16], Al x TiVCrMnFeCoNiCu [17], MoNbTaW, MoNbTaVW [18,19], and Al x CrCuFeNi [20] have been studied and characterized for their microstructures and properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys

et al. 2012

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“…However, over the last decade or so it has become apparent that this prediction often fails [16][17][18]. It is evident that the existing predictive framework is incomplete and that the theory must be adjusted to correctly describe these observations.…”

Section: Introductionmentioning

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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Competition between elements during mechanical alloying in an octonary multi-principal-element alloy system

Cited by 218 publications

References 30 publications

Amorphization of equimolar alloys with HCP elements during mechanical alloying

Amorphization of equimolar alloys with HCP elements during mechanical alloying

Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys

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

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