The incoherent γ/γ′ solvus in Ni-Al alloys

Abstract

Analysis of the kinetics of solute (Al) depletion during the coarsening of γ′ (Ni 3 Al)precipitates has been used in earlier investigations to provide values of the coherent solubility of the γ phase in binary Ni-Al alloys. As demonstrated in recent experimental investigations, the coherent solubility is a function of the total concentration of Al in the two-phase alloy. Using the model of Ardell and Maheshwari to analyze the data on coherent equilibrium, the authors estimated the incoherent equilibrium solubility of the γ′ phase over the temperature range 400 to 800 ° C. The calculated incoherent solubility limits are 3 to 5 % smaller than previously published measurements, the differences decreasing as the temperature increases. The authors argue that the calculations in this article provide the first estimates of the incoherent solvus of the γ′ phase in Ni-Al alloys.

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Cited References

  1. 37Ale:

    W.O. Alexander and N.B. Vaughan, “The Constitution of the Nickel-Aluminum System,”J. Inst. Met., 61, 247–260(1937).

    Google Scholar 

  2. 62Cah:

    J.W. Cahn, “On Spinodal Decomposition,”Acta Metall., 10, 795–801 (1961).

    Google Scholar 

  3. 66Hor:

    E. Hombogen and H. Kreye, “Anomale Änderungen des Spezifischen Elektrischen Widerstandes in Nickel-Aluminium-Legierungen,”Z Metallkd., 57, 122–129 (1966) in German.

    Google Scholar 

  4. 69Dic:

    R.W. Dickson, J.B. Wachtman, Jr., and S.M. Copley, “Elastic Constants of Single-Crystal Ni3Al from 10 to 850 °C,”J. Appl. Phys., 40, 2276–2279(1969).

    Article  ADS  Google Scholar 

  5. 69Ono:

    K. Ono and R. Stem, “Elastic Constants of Ni3Al between 80 and 600 K,”Trans. Met. Soc. AIME, 245, 171–172(1969).

    Google Scholar 

  6. 69Ras:

    P.K. Rastogi and A.J. Ardell, “The Coherent Solubilities of γ′ in Ni-ALNi-SiandNi-TiAlloys,” ActaMetall., 17,595–602(1969).

  7. 72Gen:

    W.O. Gentry and M.E. Fine, “Precipitation in Ni-11.1 at.% Al andNi-13.8at.%A1 alloys,”Acta Metall., 20, 181–190(1972).

    Article  Google Scholar 

  8. 73Lar:

    F. Larché and J.W. Cahn, “A Linear Theory of Thermochemical Equilibrium of Solids under Stress,”Acta Metall., 21, 1051–1063 (1973).

    Article  Google Scholar 

  9. 74Che:

    D.J. CheUmanand A.J. Ardell, “The Coarsening of γ′ Precipitates at Large Volume Fractions,”ActaMetall., 22, 577–588 (1974).

    Google Scholar 

  10. 74Rob:

    P.Y. Robin, “Stress and Strain in Cryptoperthite Lamellae and the Coherent Solvus of Alkali Feldspars,”Amer. Miner. 59, 1299–1318 (1974).

    Google Scholar 

  11. 80Wil:

    R.O. Williams, “Long-Period Superlattices in the Copper-Gold System as Two-Phase Mixtures,”Metall. Trans., 11A, 247–253 (1980).

    Google Scholar 

  12. 81Kay:

    F.X. Kayser and C. Stassis, “The Elastic Constants of Ni3Al at0 and 23.5 °C,”Phys. Status Solidi, A, 64, 335 (1981).

    Article  Google Scholar 

  13. 84Cah:

    J.W. Cahn and F. Larché, “A Simple Model for Coherent Equilibrium,”Acta Metall., 32, 1915–1923 (1984).

    Article  Google Scholar 

  14. 84Wil:

    R.O. Williams, “The Calculation of Coherent Phase Equilibria,”Calphad, 8, 1–14(1984).

    Article  Google Scholar 

  15. 87Joh:

    W.C. Johnson and P.W. Voorhees, “Phase Equilibrium in Two-Phase Coherent Solids,”Metall. Trans., 18A, 1213–1228(1987).

    Google Scholar 

  16. 87Wal:

    F. Wallow, G. Neite, W. Schröer and E. Nembach, “Stiffness Constants, Dislocation Line Energies, and Tensions of Ni3Al and of the γ-Phases of NIMONIC 105 and of NIMONIC PE16,”Phys. Status Solidi, 99, 483–490 (1987).

    Article  Google Scholar 

  17. 91Pfe:

    M.J. Pfeifer and P.W. Voorhees, “Coherent Phase Equilibrium in Alloys with Congruent Points,”Metall Trans., 39A, 1921–1935 (1991).

    Google Scholar 

  18. 94Ard:

    A.J. Ardell, “Measurement of Solubility Limits from Data on Precipitate Coarsening,”Experimental Methods of Phase Diagram Determination, J.E. Morral, R.S. Schiffman, and S.M. Merchant, Ed., TMS, Warrendale, PA, 57–66 (1993).

    Google Scholar 

  19. 94Cal:

    H.A. Calderon, P.W. Voorhees, J.L. Murray, and G. Kostorz, “Ostwald Ripening in Concentrated Alloys,”Acta Metall. Mater., 42, 991–1000(1994).

    Article  Google Scholar 

  20. 94Wat:

    M. Watanabe, Z. Horita, D.J. Smith, M.R. McCartney, T. Sano, and M. Nemoto, “Electron Microscopy Study of Ni/Ni3Al Diffusion-Couple Interface-I. Microstrucural Observation and Microchemical Analysis,”ActaMetall. Mater., 42, 3381–3387 (1994).

    Article  Google Scholar 

  21. 95Ard:

    A.J. Ardell and A. Maheshwari,” CoherentEquilibrium in Alloys Containing Spherical Precipitates,”Acta Metall. Mater., 43, 1825–1835(1995).

    Article  Google Scholar 

  22. 96Kam:

    A.B. Kamara, A.J. Ardell, and C.N.J. Wagner, “Lattice Misfits in Four Binary Ni-Base γ/γ′ Alloys at Ambient and Elevated Temperatures,”Metall. Trans., 27A, 2888–2896 (1996).

    Google Scholar 

  23. 96Na:

    D.-K. Na, J.B. Cohen, and P.W. Voorhees, “Phase Composition Changes Due to Coherency Strains in a Ni-24 at % V Alloy,”Scr. Mater., 35, 597–601 (1996).

    Article  Google Scholar 

  24. 97Li:

    F. Li and A.J. Ardell, “CoherentSolubility Limits of γ′-Type Phases inNi-Al,Ni-Gaand Ni-TiAlloys,”Scr. Mater. 37, 1123–1128 (1997).

    Article  Google Scholar 

  25. 98Pri:

    S. Prikhodko, J.D. Carnes, D.G. Isaak and A.J. Ardell, “Elastic Constants of a Ni-12.69 at.% Al Alloy from 295 to 1300 K,”Scr Mater., 38, 67–72(1998).

    Article  Google Scholar 

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Li, F., Ardell, A.J. The incoherent γ/γ′ solvus in Ni-Al alloys. JPE 19, 334 (1998). https://doi.org/10.1361/105497198770342067

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Keywords

  • Lattice Misfit
  • Recent Experimental Investigation
  • NIMONIC PE16
  • Coherent Equilibrium
  • Coherent Solvus