Diffusion of Refractory Elements in Ni&amp;ndash;X&amp;ndash;Y (X, Y: Re, W, Ru, Al) Ternary Alloys

Hattori, Masataka; Goto, Nobuhiro; Murata, Yoshinori; Koyama, Toshiyuki; Morinaga, Masahiko

doi:10.2320/matertrans.47.331

Cited by 12 publications

(6 citation statements)

References 9 publications

(9 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of the results regarding this topic in Ni based binary and some ternary systems have been reported in literature. 7,[18][19][20][21][22] The present paper is addressed to the interdiffusion of Re, W and Ru in the pseudo-binary and the binary systems to investigate the effect of one solute to other solute in the system. As Co is also the element contributing to the improvement of the phase stability of the superalloys, the interdiffusion in the pseudo-binary system Ni-Co-Re is investigated and the result is compared to that in the pseudo-binary Ni-Ru-Re.…”

Section: Introductionmentioning

confidence: 99%

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

et al. 2008

Self Cite

View full text Add to dashboard Cite

The present paper reports the interdiffusion of Re, W, Ru and Co in the binary and pseudo-binary Ni based alloys at 1523 K and the 0 phase coarsening kinetics of model superalloys at 1324 K. Both Re and W concentration gradients caused Ru uphill diffusion in the respective pseudo-binary diffusion couple, whereas Ru concentration gradient promoted uphill diffusion for W but not for Re. Interestingly, Re uphill diffusion occurred under the influence of Co concentration gradient but the reverse effect was not observed. The cross interdiffusion coefficients qualitatively determined from the uphill diffusion profiles were in reasonable agreement with those reported previously. Comparison of the interdiffusion coefficients in the binary and the pseudo-binary diffusion couples showed that Ru and W decreased the diffusivity of each other whereas Co appeared to be more powerful barrier atoms than Ru to decrease the Re diffusivity. Furthermore, it was evident that the coarsening kinetics of the 0 phase in both Ru-free and Ru-containing model superalloys were controlled by diffusion and Ru was found to have no effect on the rate constant of the 0 phase coarsening.

show abstract

Section: Introductionmentioning

confidence: 99%

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

et al. 2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…The diffusion of these elements in the phase of binary and ternary nickel based alloys have been documented in literature. [6][7][8][9][10][11][12] However, to the author's knowledge there is no report concerning on the diffusion of these elements in the 0 phase. The 0 phase has an order structure of L1 2 type in which Ni atoms are located at the face center site while Al atoms are at cubic corner site.…”

Section: Introductionmentioning

confidence: 95%

Diffusion of Re and Ru in the γ′ Phase of Ni Based Alloys

et al. 2008

Self Cite

View full text Add to dashboard Cite

The diffusion of Re and Ru in the 0 -Ni 3 Al phase has been investigated at a range of temperatures 1423-1523 K by using the pseudo-binary diffusion couples. It was found that the concentration gradient of Re appeared to promote the uphill diffusion of Al, whereas that of Ru did not promote the Al uphill diffusion. The cross interdiffusion coefficients ofD D Ni AlRe andD D Ni AlRu were independent of the matrix ordering since they were comparable qualitatively between those in the 0 -Ni 3 Al and in the -Ni phases. The tracer diffusion coefficients for Re and Ru in Ni 3 Al were estimated by extrapolation and the obtained activation energies were consistent with the site preferences of the elements reported in the literature. Further, the results of this work suggest that the diffusion of Ru in Ni 3 Al is mostly governed by the diffusion in Ni sublattice and the diffusion of Re is mainly controlled by the formation of anti-site defects in the Ni sublattice with negligible contribution of the anti-site bridge mechanism.

show abstract

“…Many experiments were undertaken to understand the mechanical properties, [6][7][8][9] as well as the locations and diffusion of Ta, [10][11][12] W, [13,14] and Re [15,16] in superalloys. Ta and Re atoms prefer to substitute Al sites in γ phase, while W atoms show no preference and can appear in both γ and Al sites in γ phases.…”

Section: Introductionmentioning

confidence: 99%

Spin and spin–orbit coupling effects in nickel-based superalloys: A first-principles study on Ni₃Al doped with Ta/W/Re

Liu¹,

Cao²,

Guo³

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

Heavy elements (X = Ta/W/Re) play an important role in the performance of superalloys, which enhance the strength, anti-oxidation, creep resistance, and anti-corrosiveness of alloy materials in a high-temperature environment. In the present research, the heavy element doping effects in FCC-Ni (γ) and Ni3Al (γ') systems are investigated in terms of their thermodynamic and mechanical properties, as well as electronic structures. The lattice constant, bulk modulus, elastic constant, and dopant formation energy in non-spin, spin polarized, and spin-orbit coupling (SOC) calculations are compared. The results show that the SOC effects are important in accurate electronic structure calculations for alloys with heavy elements. We find that including spin for both γ and γ' phases is necessary and sufficient for most cases, but the dopant formation energy is sensitive to different spin effects, for instance, in the absence of SOC, even spin-polarized calculations give 1% to 9% variance in the dopant formation energy in our model. Electronic structures calculations indicate that spin polarization causes a split in the metal d states, and SOC introduces a variance in the spin-up and spin-down states of the d states of heavy metals and reduces the magnetic moment of the system.

show abstract

Diffusion of Refractory Elements in Ni–X–Y (X, Y: Re, W, Ru, Al) Ternary Alloys

Cited by 12 publications

References 9 publications

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion of Re and Ru in the γ′ Phase of Ni Based Alloys

Spin and spin–orbit coupling effects in nickel-based superalloys: A first-principles study on Ni₃Al doped with Ta/W/Re

Contact Info

Product

Resources

About

Diffusion of Refractory Elements in Ni&ndash;X&ndash;Y (X, Y: Re, W, Ru, Al) Ternary Alloys

Cited by 12 publications

References 9 publications

Diffusion and &gamma;&prime; Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion and &gamma;&prime; Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion of Re and Ru in the &gamma;&prime; Phase of Ni Based Alloys

Spin and spin–orbit coupling effects in nickel-based superalloys: A first-principles study on Ni3Al doped with Ta/W/Re

Contact Info

Product

Resources

About

Diffusion of Refractory Elements in Ni–X–Y (X, Y: Re, W, Ru, Al) Ternary Alloys

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion and γ′ Phase Coarsening Kinetics in Ruthenium Containing Nickel Based Alloys

Diffusion of Re and Ru in the γ′ Phase of Ni Based Alloys

Spin and spin–orbit coupling effects in nickel-based superalloys: A first-principles study on Ni₃Al doped with Ta/W/Re