Abstract
The nitriding behavior of a series of alloys in the binary Ti-Al system has been determined at 1000 °C, under a controlled atmosphere of pure nitrogen gas, for times ranging between 7 and 100 hours. The scales and subscales were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive and wavelength dispersive X-ray analysis, electron energy loss spectroscopy, and optical microscopy. Upon formation of a surface nitride scale, the subscale became enriched in Al and resulted in the formation of a series of Al-rich intermetallic phases. This enrichment has been linked to the transport processes in the scale and subscale and a shifting of the diffusion path toward the Al-rich corner of the ternary isotherm. The formation of Al-rich intermetallic phases in the subscale was shown to result in rapid “breakaway” nitriding of the TiAl and TiAl2 alloys. The stoichiometry of the binary nitrides AlN and TiN was measured, as well as the composition of the ternary nitride “Ti2AlN.”
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R. Beye, M. Verwerft, J.T.M. De Hosson, and R. Gronsky: Acta Mater., 1996, vol. 44 (10), pp. 4225–31.
M. Dimiduk, B. Miracle, Y.-W. Kim, and M.G. Mendiratta: Iron Steel Inst. Jpn. Int., 1991, vol. 31 (10), pp. 1223–24.
G.H. Meier, F.S. Pettit, and S. Hu: J. Phys. IV, Coll. C9, suppl. J. Phys. III, 1993, vol. 3, pp. 395–402.
J.M. Rakowski, F.S. Pettit, G.H. Meier, F. Dettenwanger, E. Schumann, and M. Ruhle: Scripta Metall. Mater., 1995, vol. 33 (6), pp. 997–1003.
T.K. Roy, R. Balasubramaniam, and A. Ghosh: Metall. Mater. Trans. A, 1996, vol. 27A, pp. 4003–10.
S. Becker, A. Rahmel, M. Schorr, and M. Schutze: Oxid. Met., 1992, vol. 38 (5–6), pp. 425–64.
J.C. Schuster and J. Bauer: J. Solid State Chem., 1984, vol. 53, pp. 260–65.
W. Jeitschko, H. Nowotny, and F. Benesovsky: Monatsh. Chem., 1963, vol. 94, pp. 1198–1200.
N. Durlu, U. Gruber, M.A. Pietzka, H. Schmidt, and J.C. Schuster: Z. Metallkd., 1997, vol. 88 (5), pp. 390–400.
M. Pietzka and J.C. Schuster: J. Am. Ceramic Soc., 1996, vol. 79 (9), pp. 2321–30.
T.B. Massalaski: Binary Alloy Phase Diagrams, ASM INTERNATIONAL, Metals Park, OH, 1990.
T. Wahlstrom, L. Hultman, J.-E. Sundgren, F. Adibi, I. Petrov, and J.E. Greene: Thin Solid Films, 1993, vol. 235, pp. 62–70.
H.A. Jehn, S. Hofmann, V.-E. Ruckborn and W.-D. Munz: Journal of Vacuum Science Technol. A, 1986, vol. 4 (6), pp. 2701–12.
M.H. El-Sayed, M. Naka, and J.C. Schuster: J. Mater. Sci., 1997, vol. 32, pp. 2715–12.
A.D. Dalvi and D.E. Coates: Oxid. Met., 1972, vol. 5 (2), pp. 113–35.
K.N. Strafford and J.M. Towell: Oxid. Met., 1976, vol. 10 (1), pp. 41–67.
F. Anglezio-Abautret, B. Pellissier, M. Miloche, and P. Eveno: J. Eur. Ceramic Soc., 1991, vol. 8, pp. 299–304.
M.J. Kaufmann, D.G. Karitzer, R.D. Shull, and H.L. Fraser: Scripta Metall., 1986, vol. 20, pp. 103–08.
R. Schmid-Fetzer and K. Zeng: Metall. Mater. Trans. A, 1997, vol. 28A, pp. 1949–51.
A.T. Dinsdale: Data for Pure Elements, Scientific Group Thermodata Europe (SGTE), CALPHAD, 1991, vol. 15 (4), pp. 317–425.
N. Dupin: Ph.D. Thesis, Institut National Polytechnique de Grenoble, Grenoble, France, 1995.
E.P. George, J.A. Horton, W.D. Porter, and J.H. Schneibel: J. Mater. Res., 1990, vol. 5 (8), pp. 1639–48.
S. Becker, A. Rahmel, M. Schorr, and M. Schutze: Oxid. Met., 1992, vol. 38, pp. 425–64.
P. Kofstad: High Temperature Corrosion, Elsevier Applied Science Publishers Ltd., New York, NY, 1988.
R.F. Egerton: Electron Energy Loss Spectroscopy in the Electron Microscope, 2nd ed., Plenum Press, New York, NY, 1996.
T. Ikeda and H. Satoh: J. Jpn. Inst. Met., 1993, vol. 57 (8), pp. 919–25.
K. Zeng and R. Schmid-Fetzer: Thermodynamic modeling and applications of the Ti-Al-N Phase Diagram, Thermodynamics of Alloy Formation, Y.A. Chang and F. Sommer, eds., TMS, Warrendale, PA, 1997, pp. 275–94.
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Magnan, J., Weatherly, G.C. & Cheynet, M.C. The nitriding behavior of Ti-Al alloys at 1000 °C. Metall Mater Trans A 30, 19–29 (1999). https://doi.org/10.1007/s11661-999-0192-8
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DOI: https://doi.org/10.1007/s11661-999-0192-8