Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy

Singh, Sheela; Wanderka, N.; Murty, B.S.; Glatzel, Uwe; Banhart, John

doi:10.1016/j.actamat.2010.09.023

Cited by 709 publications

(326 citation statements)

References 16 publications

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“…The separation of the Ni-Al-rich B2 phase (matrix) and the Cr-Fe-rich A2 phase (seeds) seems to lend support to this hypothesis. Spinodal decompositions forming the compositionally different A2 and B2 phases are frequently seen in HEAs, [23,24] and it is interesting to note that in the AlCoCrCuFeNi HEA, the products of the spinodal decomposition are also Ni-Al-rich B2 phase and CrFe-rich A2 phase. [24] The cubic form of the A2 phase, rather than the modulated plates as in References, [23,24] shall originate from the need to minimize the elastic strain energy.…”

Section: Resultsmentioning

confidence: 99%

“…Spinodal decompositions forming the compositionally different A2 and B2 phases are frequently seen in HEAs, [23,24] and it is interesting to note that in the AlCoCrCuFeNi HEA, the products of the spinodal decomposition are also Ni-Al-rich B2 phase and CrFe-rich A2 phase. [24] The cubic form of the A2 phase, rather than the modulated plates as in References, [23,24] shall originate from the need to minimize the elastic strain energy. [25] The nature of the confinement of the region where the spinodal decomposition occurs, for example to within the region circled by the dash-dotted lines in Figure 2, is unclear but it could be related to the boundary effect, as the spinodal decomposition free region locates nicely along the phase boundary between the primary phase and the eutectics.…”

Section: Resultsmentioning

confidence: 99%

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Sunflower-like Solidification Microstructure in a Near-eutectic High-entropy Alloy

Guo

Liu

2013

Materials Research Letters

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Considering the inherent advantages of eutectic alloys as high-temperature materials, eutectic high-entropy alloys provide a brand new research direction for developing materials to be used in high-temperature environments. Along this line of thinking, the solidification microstructure in a near-eutectic Al 2 CrCuFeNi 2 alloy was studied. A unique sunflower-like eutectic colony structure was observed, where the Ni-Al-rich B2 phase formed as the primary phase with a spherical or ellipsoidal morphology, the Ni-Al-rich B2/Cr-rich A2 eutectics grew on the primary phase in a radial manner, and the primary B2 phase further decomposed into nearly cubic particles dispersed in the matrix at lower temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sunflower-like Solidification Microstructure in a Near-eutectic High-entropy Alloy

Guo

Liu

2013

Materials Research Letters

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“…[2,20,21] It also contributes to the excellent performance of HEA coatings as diffusion barriers. [22,23] Moreover, it allows better high-temperature strength and structural stability, which are discussed in Section 5.…”

Section: Sluggish Diffusion Effectmentioning

confidence: 99%

“…This is evidenced by detailed transmission electron microscopy (TEM) and atomic probe analysis. [21,31,32] Thirdly, in HEAs similar disordered and ordered versions of the same base structure often co-exist. [8,[33][34][35] For example, coexistence of BCC and ordered BCC (B2) phases was frequently reported.…”

Section: Simple Solid Solution or Intermetallics? One Fundamental Anmentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,507

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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“…However, atomic size, enthalpy of mixing and additional considerations surely affect stability also [3][4][5][6][7]. Indeed, decomposition into multiple phases has been observed experimentally in certain high entropy alloy families [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy

Widom

Huhn

Maiti

et al. 2013

Metall Mater Trans A

182

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The high entropy alloy containing refractory metals Mo-Nb-Ta-W has a body centered cubic structure, which is not surprising given the complete mutual solubility in BCC solid solutions of all pairs of the constituent elements. However, first principles total energy calculations for the binaries reveal a set of distinct energy minimizing structures implying the likelihood of chemically ordered low temperature phases. We apply a hybrid Monte Carlo and molecular dynamics method to evaluate the temperature-dependent chemical order. Monte Carlo species swaps allow equilibration of the structure that cannot be achieved by conventional molecular dynamics. At 300 K a cesiumchloride ordering emerges between mixed (Nb,Ta) sites and mixed (Mo,W) sites. This order is lost at elevated temperatures.

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Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy

Cited by 709 publications

References 16 publications

Sunflower-like Solidification Microstructure in a Near-eutectic High-entropy Alloy

Sunflower-like Solidification Microstructure in a Near-eutectic High-entropy Alloy

High-Entropy Alloys: A Critical Review

Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy

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