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The Influence of Tungsten on the Chemical Composition of a Temporally Evolving Nanostructure of a Model Ni-Al-Cr Superalloy

Published online by Cambridge University Press:  01 June 2004

Chantal K. Sudbrack ,
Dieter Isheim ,
Ronald D. Noebe ,
Nathan S. Jacobson  and
David N. Seidman
Chantal K. Sudbrack
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
Dieter Isheim
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
Ronald D. Noebe
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
Nathan S. Jacobson
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
David N. Seidman
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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Abstract

The influence of W on the temporal evolution of γ′ precipitation toward equilibrium in a model Ni-Al-Cr alloy is investigated by three-dimensional atom-probe (3DAP) microscopy and transmission electron microscopy (TEM). We report on the alloys Ni-10 Al-8.5 Cr (at.%) and Ni-10 Al-8.5 Cr-2 W (at.%), which were aged isothermally in the γ + γ′ two-phase field at 1073 K, for times ranging from 0.25 to 264 h. Spheroidal-shaped γ′ precipitates, 5–15 nm diameter, form during quenching from above the solvus temperature in both alloys at a high number density (∼1023 m−3). As γ′ precipitates grow with aging at 1073 K, a transition from spheriodal- to cuboidal-shaped precipitates is observed in both alloys. The elemental partitioning and spatially resolved concentration profiles across the γ′ precipitates are obtained as a function of aging time from three-dimensional atom-by-atom reconstructions. Proximity histogram concentration profiles (Hellman et al., 2000) of the quaternary alloy demonstrate that W concentration gradients exist in γ′ precipitates in the as-quenched and 0.25-h aging states, which disappear after 1 h of aging. The diffusion coefficient of W in γ′ is estimated to be 6.2 × 10−20 m2 s−1 at 1073 K. The W addition decreases the coarsening rate constant, and leads to stronger partitioning of Al to γ′ and Cr to γ.

Keywords

nickel-base superalloythree-dimensional atom-probe microscopytungstenaluminumchromiumtemporal evolutiondecompositioncoarseningnanostructurepartitioning ratioproxigram
Type
Research Article
Information
Microscopy and Microanalysis , Volume 10 , Issue 3 , June 2004 , pp. 355 - 365
Copyright
© 2004 Microscopy Society of America

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References

REFERENCES

Amano, J. & Seidman, D.N. (1981). Range profiles of low-energy (100 to 1500 eV) implanted 3He and 4He atoms in tungsten. Phil Mag A 44, 177–198.Google Scholar
Amano, J., Wagner, A., & Seidman, D.N. (1984). Diffusivity of 3He atoms in perfect tungsten crystals. J Appl Phys 56, 983–992.Google Scholar
Ardell, A.J. & Nicholson, R.B. (1966). On modulated structure in aged Ni-Al alloys. Acta Met Mater 14, 1285–1309.Google Scholar
Blavette, D., Bostel, A., & Sarrau, J.M. (1985). Atom-probe microanalysis of a nickel-base superalloy. Met Trans A 16A, 1703–1711.Google Scholar
Blavette, D., Caron, P., & Khan, T. (1986). An atom-probe investigation of the role of rhenium additions in improving creep resistance of Ni-base superalloys. Scr Met Mater 20, 1395–1400.Google Scholar
Cerezo, A., Godfrey, T.J., Sijbrandij, S.J., Smith, G.D.W., & Warren, P.J. (1998). Performance of an energy-compensated three-dimensional atom-probe. Rev Sci Instr 68, 49–58.Google Scholar
Copland, E.H., Jacobson, N.S., & Ritzert, F.J. (2001). Computational thermodynamic study to predict complex phase equilibria in the nickel-base superalloy René N6. NASA/TM, 210897.
Durand-Charre, M. (1997). The Microstructure of Superalloys. Amsterdam: Gordon and Breach Science.
Gleiter, H. & Hornbogen, E. (1967). Formation of coherent ordered precipitates in a Ni-Cr-Al-alloy. Z Metallk 58, 157–163.Google Scholar
Gust, W., Hintz, H.B., Lodding, A., Odelius, H., & Predel, B. (1981). Impurity diffusion of Al in Ni single crystals studied by secondary ion mass spectrometry. Phys Status Solidi A 64, 187–191.Google Scholar
Hellman, O.C., Blatz du Rivage, J., & Seidman, D.N. (2003). Efficient sampling for three dimensional atom probe microscopy data. Ultramicroscopy 95, 199–205.Google Scholar
Hellman, O.C., Vandenbroucke, J.A., Blatz du Rivage, J., & Seidman, D.N. (2002). Application software for three-dimensional atom-probe data analysis. Mat Sci Eng A 327, 29–33.Google Scholar
Hellman, O.C., Vandenbroucke, J.A., Rüsing, J., Isheim, D., & Seidman, D.N. (2000). Analysis of three-dimensional atom-probe data by the proximity histogram. Microsc Microanal 6, 437–444.Google Scholar
Huang, W. & Chang, Y.A. (1999). A thermodynamic description of the Ni-Al-Cr-Re system. Mat Sci Eng A 259, 110–119.Google Scholar
Hyde, J.M., Cerezo, A., Setna, R.P., Warren, P.J., & Smith, G.D.W. (1994). Lateral and depth scale calibration of the position sensitive atom-probe. Appl Surf Sci 76/77, 382–391.Google Scholar
Jena, A.K. & Chaturvedi, M.C. (1984). The role of alloying elements in the design of nickel-base superalloys. J Mat Sci 19, 3121–3139.Google Scholar
Karunaratne, M.S.A., Carter, P., & Reed, R.C. (2000). Interdiffusion in the face-centered cubic phase of the Ni-Re, Ni-Ta and Ni-W systems between 900 and 1300°C. Mat Sci Eng A 281, 229–233.Google Scholar
Kelly, P.M. (1982). Quantitative electron microscopy. Metals Forum 5, 13–23.Google Scholar
Miller, M.K. (2000). Atom Probe Tomography. New York: Kluwer Academic.
Monma, K., Suto, H., & Oikawa, H. (1964). Diffusion of Ni63 and Cr51 in nickel-chromium alloys. J Jpn Inst Met 28, 188–192.Google Scholar
Nathal, M.V. & Ebert, L.J. (1985). The influence of cobalt, tantalum, and tungsten on the microstructure of single crystal nickel-base superalloys. Met Trans A 16A, 1849–1862.Google Scholar
Pareige, C., Soisson, F., Martin, G., & Blavette, D. (1999). Ordering and phase separation in Ni-Cr-Al: Monte Carlo simulations vs. three-dimensional atom-probe. Acta Mater 47, 1889–1899.Google Scholar
Parratt, L.G. (1966). Probability and Experimental Errors in Science. New York: John Wiley and Sons.
Saunders, N. (2002). Ni-DATA v.4, Guildford, Surrey, UK: Thermotech Ltd.
Saunders, N. (1995). Phase-diagram calculations for high temperature structural materials. Philos T Roy Soc A 351, 543–561.Google Scholar
Saunders, N. (1996). Phase-diagram calculations for Ni-based superalloys. In Superalloys 1996, Kissinger, J.D., Deye, D.J., Anton, D.L., Cetel, A.D., Nathal, M.V., Pollock, T.M. & Woodford, D.A. (Eds.), pp. 101–110. Warrendale, PA: TMS.
Schmuck, C., Caron, P., Hauet, A., & Blavette, D. (1997). Ordering and precipitation of gamma′ phase in low supersaturated Ni-Cr-Al model alloy: An atomic scale investigation. Phil Mag A 76, 527–542.Google Scholar
Schmuck, C., Danoix, F., Caron, P., Hauet, A., & Blavette, D. (1996). Atomic scale investigation of ordering and precipitation processes in a model Ni-Cr-Al alloy. Appl Surf Sci 94/5, 273–279.Google Scholar
Sebastian, J.T., Hellman, O.C., & Seidman D.N. (2001). A new method for the calibration of three-dimensional atom-probe mass spectra. Rev Sci Instr 72, 2984–2988.Google Scholar
Sims, C.T. & Hagel, W.C. (1972). The Superalloys. New York: John Wiley & Sons.
Sudbrack, C.K., Yoon, K.Y., Mao, Z., Noebe, R.D., Isheim, D., & Seidman, D.N. (2003). Temporal evolution of nanostructures in a model nickel-base superalloy: Experiments and simulations. In Electron Microscopy: Its Role in Materials Science, Weertman, J.R., Fine, M.E., Faber, K.T., King, W. & Liaw, P. (Eds.), pp. 43–50. Warrendale, PA: TMS.
Sundman, B., Jansson, B., & Andersson, J.-O. (1985). Calphad-computer coupling of phase diagrams and thermochemistry. CALPHAD 9, 153–190.Google Scholar
van Bakel, G.P.E.M., Hariharan, K., & Seidman, D.N. (1995). On the structure and chemistry of Ni3Al on an atomic scale via atom-probe field-ion microscopy. Appl Surf Sci 90, 95–105.Google Scholar
Wagner, A. & Seidman, D.N. (1979). Range profiles of 300- and 475-eV 4He+ ions and the diffusivity of 4He in tungsten. Phys Rev Lett 42, 515–518.Google Scholar
Warren, P.J., Cerezo, A., & Smith, G.D.W. (1998). An atom-probe study of the distribution of rhenium in a nickel-based superalloy. Mat Sci Eng A 250, 88–92.Google Scholar
Yamamoto, M. & Seidman, D.N. (1983). The quantitative compositional analysis and field-evaporation behavior of ordered Ni4Mo on an atomic plane-by-plane basis: An atom-probe field-ion microscope study. Surf Sci 129, 281–300.Google Scholar