Solid solution island of the Co-Cr-Fe-Ni high entropy alloy system

He, Feng; Wang, Zhijun; Wu, Qingfeng; Niu, Sizhe; Li, Junjie; Wang, Jincheng; Liu, C.T.

doi:10.1016/j.scriptamat.2016.12.033

Cited by 90 publications

(35 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The circular red points clearly demonstrate that the phase is much more prevalent than the thermodynamic simulations predict. This is consistent with previous similar comparisons of experimental and predicted phase stability in the CrMnFeCoNi system [8,9,11].…”

Section: Fidelity Of Thermodynamic Predictionssupporting

confidence: 93%

“…The CrMnFeCoNi high entropy alloy (HEA), first proposed and discussed by Cantor et al [1], has formed the basis of a number of studies on HEAs, many of which focus on understanding the phase equilibria and precipitation behaviour of the alloy [2][3][4][5][6][7][8][9][10]. It has now been conclusively established that a single, stable fcc (A1) solid solution phase exists at temperatures above 8 C the alloy melting temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In the CrMnFeCoNi system, thermodynamic predictions have been used to investigate the stability of the single fcc solid solution phase, particularly with respect to the phase. He et al [9] used the CALPHAD approach to identify the limits of the stability of single phase solid solutions based on the CrFeCoNi system. These results, which were verified using experimental data of alloys exposed at C , illustrated that the concentration of Cr that may be tolerated in the alloys is lower than any of the other constituent elements.…”

Section: Introductionmentioning

confidence: 99%

“…Whilst C M now well established, understanding the role that Ni, Co and Fe have on the stability of the single phase fcc solid solution is equally important in providing a holistic view of the CrMnFeCoNi system. He et al [9], postulated that additions of Fe, Co and Ni of up to 40 at. % would stabilise the single fcc solid solution phase C In contrast, Bracq et al [8] suggested that the stability of the fcc solid solution would increase with Ni and Co additions, but that increased concentrations of Fe destabilised the alloy towards the formation of intermetallic phases.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

Christofidou

McAuliffe

Mignanelli

et al. 2019

Journal of Alloys and Compounds

View full text Add to dashboard Cite

The almost limitless variations in potential compositions of high entropy alloys necessitates the use of computational methods when attempting to optimise for any given application. However, the accuracy of the current thermodynamic approaches commonly being used for this purpose remains under debate, as relatively few validatory studies have been performed. Within the CrMnFeCoNi family of alloys, the formation of the phase and how it is influenced by compositional variations is of particular interest for elevated temperature structural applications. Here, the role of Ni on the formation of the phase has been studied through a systematic series of CrMnFeCoNix alloys, 0 x 1.5, following 1000 hour exposures at temperatures typically found to promote formation. Ni was found to have a significant effect on the phase stability of these alloys, suppressing the phase such that a single solid solution phase was the only stable phase in the CrMnFeCoNi1.5 alloy, whilst the CrMnFeCo alloy formed the phase during solidification. The corresponding thermodynamic predictions varied dramatically from the experimentally observed microstructures, indicating that the underlying databases require further optimisation. Interestingly, it was found that a relatively simple electronic structure based approach, New PhaComp, provided much more accurate predictions of the observed phase formation in the CrMnFeCoNix and CrMnxFeCoNi systems and could be manipulated to obtain formation temperatures. As such, this method could be extremely useful to those wanting to design CrMnFeCoNi high entropy alloys that are free from the phase.

show abstract

Section: Fidelity Of Thermodynamic Predictionssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

Christofidou

McAuliffe

Mignanelli

et al. 2019

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…Shi et al [6] and Qiu et al [7] summarized the researches of corrosion-resistant HEAs, including the corrosionresistant property of HEAs in various aqueous environments. Compared with conventional alloys, some HEAs possess better corrosion resistance, which is attributed to the simple phase composition and uniform element distribution [8][9][10]. CoCrFeNi was demonstrated to have good corrosion resistance because of the single face-centered cubic (fcc) structure and the dominant effect of Cr [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Addition on Corrosion Behavior of High-Entropy Alloys CoCrFeNiMox in Aqueous Environments

Shang

Wang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

109

View full text Add to dashboard Cite

The corrosion behavior of CoCrFeNiMo x alloys was investigated in aqueous environments, NaCl and H 2 SO 4 solutions, respectively, to simulate typical neutral and acidic conditions. The cyclic polarization curves in NaCl and the potentiodynamic curves in H 2 SO 4 clearly reveal the beneficial effects of Mo and the detrimental effect of r-phase on the corrosion resistance. The X-ray photoelectron spectroscopy results of CoCrFeNiMo x alloys in H 2 SO 4 solution indicate that Cr and Mo predominate the corroded surface of the alloys, where Mo primarily exists in the form of MoO 3 .

show abstract

Microstructure and Mechanical Properties of Face‐Centered‐Cubic‐Based Cr‐Free Equiatomic High‐Entropy Alloys

Liu

Zhang

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

High‐entropy alloys (HEAs) with face‐centered‐cubic (FCC) structures, e.g., the typical CrMnFeCoNi HEA, have a strong tendency to precipitate brittle sigma phases, as Cr is a strong sigma stabilizer. To develop HEAs with alleviated concerns of sigma phases, Cu for Cr in the Cr‐Mn‐Fe‐Co‐Ni HEA system is substituted to form a Mn‐Fe‐Co‐Ni‐Cu system. The quinary alloy and its quaternary subsets are investigated all in as‐cast state. Microstructure evolution, phase constituent, and tensile properties at room temperature are studied. The HEAs have multi‐phase FCC structures with slightly different lattice constants and spherical Cu‐rich particles are observed in most systems. All alloys exhibit dendrite‐like morphology with Cu segregation in interdendritic regions due to the solute partitioning. The investigated HEAs show good strengths, large elongations, and work hardening capability. The strengths are attributed to combined mechanisms, especially the precipitation strengthening by Cu‐rich particles. The findings provide some model HEA systems for further usefully guiding design in the widely compositional space of Cr‐free HEAs.

show abstract

Solid solution island of the Co-Cr-Fe-Ni high entropy alloy system

Cited by 90 publications

References 26 publications

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

Effect of Mo Addition on Corrosion Behavior of High-Entropy Alloys CoCrFeNiMox in Aqueous Environments

Microstructure and Mechanical Properties of Face‐Centered‐Cubic‐Based Cr‐Free Equiatomic High‐Entropy Alloys

Contact Info

Product

Resources

About