Abstract
A variety of heat treatments have been employed to explore phase equilibria and the development of microstructure in a Ti-24Al-15Nb alloy. These include solution treatments both above and below the β-transus, followed by controlled cooling and aging at temperatures high enough to preclude ω-phase formation. The phase fieldsβ, β o, α2 + βo, α2 +β o + O, andβ o + O have been identified in the alloy, and schematic time-temperature-transformation (TTT) curves are proposed for continuous cooling transformations from theβ phase. The composition of the α2 andβ o phases in the α2 +β o region and of the α2,β o and O phases in the ternary phase field have been obtained by analytical electron microscopy.
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References
M.J. Blackburn, D.L. Ruckle, and C.E. Bevan: U.S. Air Force Technical Report, AFML-TR-78-18, 1978.
M.J. Blackburn and M.P. Smith: U.S. Air Force Technical Report, AFML-TR-80-4175, 1980.
M.J. Blackburn and M.P. Smith: U.S. Air Force Technical Report, AFML-TR-82-4086, 1982.
D. Banerjee, A.K. Gogia, T.K. Nandy, and V.A. Joshi:Acta Metall., 1988, vol. 36, pp. 871–82.
L.A. Bendersky, W.J. Boettinger, B.P. Burton, F.S. Biancaniello, and C.B. Shoemaker:Acta Metall., 1990, vol. 38, pp. 931–43.
R. Strychor, J.C. Williams, and W.A. Soffa:Metall. Trans. A, 1988, vol. 19A, pp. 225–34.
L.A. Bendersky and W.J. Boettinger:High Temperature Ordered Intermetallic Alloys III, CT. Liu, A.I. Taub, N.S. Stoloff, and C.C. Koch, eds., MRS, Pittsburgh, PA, 1989, pp. 45–50.
J.H. Perepezko, Y.A. Chang, L.E. Scitzman, J.C. Lin, N.R. Bonda, T.J. Jewett, and J.C. Mishurada:High Temperature Aluminides andIntermetallics, S.H. Whang, C.T. Liu, D.P. Pope, and J.O. Stiegler, eds., TMS/ASM INTERNATIONAL, Warrendale, PA, 1990, pp. 19–47.
T.J. Jewett, J.C. Lin, K.C. Hsieh, N.R. Bonda, Y.A. Chyang, and J.H. Perepezko:High Temperature Ordered Intermetallic Alloys III, C. T. Liu, A.I. Taub, N.S. Stoloff, and C.C. Koch, eds., MRS, Pittsburgh, PA, 1989, pp. 69–74.
D. Banerjee, T.K. Nandy, A.K. Gogia, and K. Muraleedharan:6th World Conf. on Titanium, P. Lacombe, R. Tricot, and G. Beranger, eds.,J. Phys., Les Ulis, France, 1989, pp. 1091–96.
M.J. Kaufman, J.F. Broderick, C.H. Ward, R.G. Rowe, and F.H. Froes:6th World Conf. on Titanium, P. Lacombe, R. Tricot, and G. Beranger, eds.,J. Phys., Les Ulis, France, 1989, pp. 985–90.
H.T. Kestner-Weykamp, C.H. Ward, T.F. Broderick, and M.J. Kaufman:Scripta Metall., 1989, vol. 23, pp. 1697–1702.
H.T. Kestner-Weykamp, D.R. Baker, D.M. Paxton, and M.J. Kaufman:Scripta Metall., 1990, vol. 24, pp. 445–50.
R.G. Rowe:High Temperature Aluminides and Intermetallics, S.H. Whang, C. T. Liu, D.P. Pope, and J.O. Stiegler, eds., TMS/ ASM INTERNATIONAL, Warrendale, PA, 1990, pp. 375–401.
A.K. Gogia, D. Banerjee, and T.K. Nandy:Metall. Trans. A, 1990, vol. 21A, pp. 609–25.
J.M. Larsen, K.A. Williams, S.J. Balsone, and M.A. Stucke:High Temperature Aluminides and Intermetallics, S.H. Whang, C. T. Liu, D.P. Pope, and J.O. Stiegler, eds., TMS/ASM INTERNATIONAL, Warrendale, PA, 1990, pp. 521–56.
R.A. Spurling:Metall. Trans. A, 1975, vol. 6A, pp. 1660–61.
K. Muraleedharan and D. Banerjee:Metall. Trans. A, 1989, vol. 20A, pp. 1139–42.
K. Muraleedharan, S.V. Nagender Naidu, and D. Banerjee:Scripta Metall., 1990, vol. 24, pp. 27–32.
A.K. Gogia: Ph.D. Thesis, Defence Metallurgical Research Laboratory, Hyderabad, India, and Banaras Hindu University, Varanasi, India, 1990.
K. Muraleedharan, T.K. Nandy, and D. Banerjee:Metall. Trans. A, 1992, vol. 23A, pp. 417–31.
F.N. Rhines:Phase Diagrams in Metallurgy, McGraw Hill, New York, NY, 1956, p. 85.
J.L. Murray:Binary Alloy Phase Diagrams, T.B. Massalski, ed., ASM, Metals Park, OH, 1986, pp. 173–76.
W.A. Baeslack III and T. Broderick:Scripta Metall., 1990, vol. 24, pp. 319–24.
J.A. Peters and C. Bassi:Scripta Metall., 1990, vol. 24, pp. 915–20.
M. Hillert:J. Iron Steel Inst., 1958, vol. 189, p. 224.
A. Prince:Alloy Phase Equilibria, Elsevier, London, 1966, pp. 152–59.
A.K. Gogia, D. Mukherjee, and D. Banerjee: Defence Metallurgical Research Laboratory, Hyderabad, India, unpublished research, 1990.
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Muraleedharan, K., Gogia, A.K., Nandy, T.K. et al. Transformations in a Ti-24AI-15Nb alloy: Part I. Phase equilibria and microstructure. Metall Trans A 23, 401–415 (1992). https://doi.org/10.1007/BF02801158
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DOI: https://doi.org/10.1007/BF02801158