Evolution of γ/γ' phases, their misfit and volume fractions in Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy

Manzoni, Anna M.; Haas, Sebastian; Yu, Jingyi; Daoud, Haneen; Glatzel, Uwe; Aboulfadl, Hisham; Mücklich, Frank; Duran, Rüya; Schmitz, Guido; Többens, Daniel M.; Matsumura, Shuichi; Vogel, Florian; Wanderka, N.

doi:10.1016/j.matchar.2019.06.009

Cited by 20 publications

(18 citation statements)

References 46 publications

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“…As discussed above, Al, Cr and Fe elements in core area of the concave cube distribute uniformly and the concentration of Al is higher than Cr and Fe, which is consistent with the other researchers [73,74]. Besides, with the distance getting closer to the corner, concentration of Al decreases and concentrations of Cr and Fe increase, which is probably due to lower Al and higher Cr and Fe in γ matrix after long duration time [75]. It is shown that the concentration of Al, Cr and Fe in γ′ remains stable in the early stage and with the aging time increasing, Cr and Fe increase and Al decreases [76].…”

Section: Cuboidal γ′ → Concave Cuboidal γ′ Evolution Under Fc Conditionsupporting

confidence: 89%

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Zhang

Peng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this work, water cooling, air cooling (AC) and furnace cooling (FC) were applied to investigate the effect of cooling rate on microstructure evolution of primary γ′ in a newly designed Ni 3 Al-based alloy. The results showed that nucleation rate of primary γ′ increased with increasing cooling rate. In addition, higher cooling rate shortened growth period of primary γ′, which made its morphology close to the initial precipitated γ′. For AC and FC specimens, due to the lower cooling rate, primary γ′ possessed longer growth period and its morphology was mainly due to the evolution of lattice misfit between γ and primary γ′. Meanwhile, growth of primary γ′ depended on lattice misfit distribution between its corner and edge area. Moreover, primary γ′ morphologies of sphere, cube and concave cube with tip corners were illustrated by considering interaction between elemental diffusion and elastic strain energy.

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Section: Cuboidal γ′ → Concave Cuboidal γ′ Evolution Under Fc Conditionsupporting

confidence: 89%

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Zhang

Peng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…At a higher magnification, all alloys reveal a c-c¢ morphology, as has been shown before for the base alloy and the alloy with Mo and Hf. [2][3][4]15] As these phases are not relevant for this study, they will not be presented in further detail. Figure 4(a) shows the heating curves up to the onset of the melting peak in the DSC responses of the base alloy and its five variations.…”

Section: Resultsmentioning

confidence: 99%

“…The complete setup of the beamline has been shown in a previous work. [4] Two angles are of major importance in this study: the angle chi, which is perpendicular to the plane set up by the source-sample-detector, or by h to 2h, and the angle 2h from which the lattice parameter can be determined. The detector gives information in 2D and covers a range of about 14 deg in both 2h and chi.…”

Section: Methodsmentioning

confidence: 99%

“…This corresponds to the peaks of the c¢ and c phases, as has been shown in previous studies. [4] However, the alloy with W in (a), homogenized at 1220°C, shows only one response (c) in the chi axis, while the alloy with Zr in (b), homogenized at 1100°C, shows four different responses, which can be attributed to four different dendrites. An analysis of their positions (d) shows that they are separated by about 0.2 deg from the next dendrite.…”

Section: Influences Of the Enforced Lower Homogenization Temperatumentioning

confidence: 99%

“…During the last few years, the authors' group has found the Al 10 Co 25 Cr 8 Fe 15 Ni 36 Ti 6 CCA to be of high interest for a potential application at around 700°C. [2][3][4][5] Optimizing parameters have been predicted by Ther-moCalc [6] using the TTNI7 database, [7] tested in numerous casting and heat treatment experiments until the best parameters had been found to be 1220°C 20 hours for homogenization. Once the alloy reached its best microstructural and mechanical properties, another path for further improvement was chosen, i.e.…”

Section: Introductionmentioning

confidence: 99%

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On the Formation of Eutectics in Variations of the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy

Manzoni

Dubois

Mousa

et al. 2020

Metall Mater Trans A

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Superalloy inspired Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy is known for its γ-γ′ microstructure and the third Heusler phase. Variations of this alloy, gained by replacing 0.5 or 1 at. pct Al by the equivalent amount of Mo, W, Zr, Hf or B, can show more phases in addition to this three-phase morphology. When the homogenization temperature is chosen too high, a eutectic phase formation can take place at the grain boundaries, depending on the trace elements: Mo and W do not form eutectics while Hf, Zr and B do. In order to avoid the eutectic formation and the potential implied grain boundary weakening, the homogenization temperature must be chosen carefully by differential scanning calorimetry measurements. A too low homogenization temperature, however, could impede the misorientation alignment of the dendrites in the grain. The influence of grain boundary phases and incomplete dendrite re-orientation are compared and discussed.

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Controlling Lattice Misfit and Creep Rate Through the γ' Cube Shapes in the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy with Hf and W Additions

Yesilcicek¹,

Haas

Ocaño³

et al. 2022

High Entropy Alloys & Materials

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Trace elements play an important role in the fine-tuning of complex material properties. This study focuses on the correlation of microstructure, lattice misfit and creep properties. The compositionally complex alloy Al10Co25Cr8Fe15Ni36Ti6 (in at. %) was tuned with high melting trace elements Hf and W. The microstructure consists of a γ matrix, γ' precipitates and the Heusler phase and it is accompanied by good mechanical properties for high temperature applications. The addition of 0.5 at.% Hf to the Al10Co25Cr8Fe15Ni36Ti6 alloy resulted in more sharp-edged cubic γ′ precipitates and an increase in the Heusler phase amount. The addition of 1 at.% W led to more rounded γ′ precipitates and the dissolution of the Heusler phase. The shapes of the γ' precipitates of the alloys Al9.25Co25Cr8Fe15Ni36Ti6Hf0.25W0.5 and Al9.25Co25Cr8Fe15Ni36Ti6Hf0.5W0.25, that are the alloys of interest in this paper, create a transition from the well-rounded precipitates in the alloy with 1% W containing alloy to the sharp angular particles in the alloy with 0.5% Hf. While the lattice misfit has a direct correlation to the γ' precipitates shape, the creep rate is also related to the amount of the Heusler phase. The lattice misfit increases with decreasing corner radius of the γ' precipitates. So does the creep rate, but it also increases with the amount of Heusler phase. The microstructures were investigated by SEM and TEM, the lattice misfit was calculated from the lattice parameters obtained by synchrotron radiation measurements.

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Evolution of γ/γ' phases, their misfit and volume fractions in Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy

Cited by 20 publications

References 46 publications

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

On the Formation of Eutectics in Variations of the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy

Controlling Lattice Misfit and Creep Rate Through the γ' Cube Shapes in the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy with Hf and W Additions

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