Effects of Mn, Ti and V on the microstructure and properties of AlCrFeCoNiCu high entropy alloy

Li, B.S.; Wang, Y.P.; Ren, Maozhi; Yang, Chunli; Fu, Hengzhi

doi:10.1016/j.msea.2008.08.025

Cited by 227 publications

(77 citation statements)

References 18 publications

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“…Besides the above, many other elements have been added to the Al-Co-Cr-Cu-Fe-Ni system (e.g. Zr [91], Nd [91], Nb [92], V [93,94], Y [95], Sn [96,97], Zn [98], and C [99,100]). …”

Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,639

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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“…Besides the above, many other elements have been added to the Al-Co-Cr-Cu-Fe-Ni system (e.g. Zr [91], Nd [91], Nb [92], V [93,94], Y [95], Sn [96,97], Zn [98], and C [99,100]). …”

Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,639

853

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“…Considering the V addition, the equiatomic alloy AlCoCrCuFeNiV was studied by Li et al [37] The XRD pattern revealed the existence of both Bcc and Fcc structures in the as-cast sample. A typical dendrite structure was observed in the SEM image.…”

Section: Transitions From Fcc To Bccmentioning

confidence: 99%

TCHEA1: A Thermodynamic Database Not Limited for “High Entropy” Alloys

Mao

Chen²,

Chen³

2017

J. Phase Equilib. Diffus.

136

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In this paper we report a thermodynamic database which was developed by using the CALPHAD approach. The TCHEA1 database includes 15 chemical elements (Al, Co, Cr, Cu, Fe, Hf, Mn, Mo, Nb, Ni, Ta, Ti, V, W and Zr). It is suitable for the study of Bcc and Fcc HEA systems. The database is constructed based on the thermodynamic assessment of all binary systems and many key ternary systems where almost all possible metastable and stable phases are considered. It is extensively demonstrated in the present work that TCHEA1 gives satisfactory prediction on the phase equilibria in various HEA systems (quaternary to ennead) and wide temperature ranges (liquidus to subsolidus). Thermodynamic stability calculations of simple solid solutions (Bcc and Fcc) and intermetallics (sigma, Laves, l-phase etc.) are validated against the available experimental information in as-cast or as-annealed state. Such CALPHAD database focusing on the modelling of Gibbs energy rather than entropy makes reliable predictions of thermodynamic equilibrium and phase transformation, no matter whether the alloy/system has high entropy or not. Cases with miscibility gap in liquid and solid solutions and second-order phase transition at low temperatures are demonstrated. With the volume data included, TCHEA1 is capable to predict the density and thermal expansion coefficient of HEAs as well. This thermodynamic database is also applicable in process simulations when used together with compatible kinetic databases.

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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

345

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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Effects of Mn, Ti and V on the microstructure and properties of AlCrFeCoNiCu high entropy alloy

Cited by 227 publications

References 18 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

TCHEA1: A Thermodynamic Database Not Limited for “High Entropy” Alloys

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

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