Abstract
Two Ni-modified Al3Ti alloys (Al65Ni10Ti25 and Al62Ni8Ti30) were rapidly solidified by melt spinning. The resulting microstructure was studied using light microscopy and analytical electron microscopy. Significant variations in the microstructure and phases were observed between the two ribbons and through the thickness of each ribbon.A single-phase γ-TiAl structure was seen near the wheel side of the Al62Ni8Ti30 ribbon, having microcrystalline grains ∼ 100 nm in diameter. Second-phase particles of Λ-AlNiTi were found in the remaining regions of that ribbon as the structure became columnar due to reduced rates of cooling. The Al65Ni10Ti25 alloy exhibited a primary phase of π-Al6.5 NiTi2.5. A second phase of μ-Al2NiTi formed with morphology and distribution varying through thickness. Microchemistry measurements on the phases indicated substantial deviations (up to 14 at. %) from the stoichiometric compositions. Further, the π, γ, and μ are low-temperature phases that do not form by solidification under equilibrium conditions. The observation of these phases thus suggests significant undercoolings achieved during the melt-spinning processing of the present alloys. Both ribbons are brittle as spun.
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References
W. B. Pearson, The Crystal Chemistry and Physics of Metals and Alloys (Wiley, New York, 1972).
D. G Pettifor, New Sci. No. 5, 48 (1986).
B. H. Kear and H. G. Wilsdorf, Trans. AIME 224, 382 (1962).
T. Takasugi and O. Izumi, Acta Metall. 33, 39 (1985).
K. Aoki and O. Izumi, J. Jpn. Inst. Met. 43, 1190 (1979).
S. C. Huang, A. I. Taub, and K. M. Chang, Acta Metall. 32, 1703 (1984).
C. T. Liu, C. L. White, and J. A. Horton, Acta Metall. 33, 213 (1985).
S.Hori, S. Saji, and T. Kobayashi, J. Jpn. Inst. Met. 37, 1135 (1973).
N. Ryum, J. Mater. Sci. 10, 2075 (1975).
A. Raman and K. Schubert, Z. Metall. 56, 40 (1965).
A. Raman and K. Schubert, Z. Metall. 56, 99 (1965).
P. G. Nash, Bull. Alloy Phase Diagr. 3, 367 (1982).
V. Ya. Markiv, V. V. Burnashova, and V. R. Ryabov, Akad. Nauk Ukv. RSR Metall. 46, 103 (1973).
R. G. Rowe and R. A. Amato, in the Proceedings of the American Society for Metals Conference on Rapidly Solidified Materials, October 1986, Orlando, Florida, edited by F.H. Froes (American Society for Metals, Metals Park, OH, 1986).
S. C. Huang, R. P. Laforce, A. M. Ritter, and R. P. Goehner, Metall. Trans. A 16, 1773 (1985).
S. C. Huang, E. L. Hall, and M. F. X. Gigliotti, in the Proceedings of the Materials Research Society Symposium on High-Temperature Ordered Intermetallic Alloys, II, December 1986, Boston, Massachusetts, edited by C. C. Koch, C. T. Liu, N. S. Stoloff, and O. Izuni (Materials Research Society, Pittsburgh, PA, 1986), p. 481.
J. V. Wood and R. W. K. Honeycombe, Philos. Mag. A 37, 501 (1978).
H. A. Davies, N. Shohoji, and D. H. Warrington, in the Proceedings of the 2nd International Conference on Rapid Solidification Processing–Principles and Technologies, Reston, Virginia, March 1980, edited by R. Mehrabian, B. H. Kear, and M. Cohen (Claitor’s, Baton Rouge, LA, 1980), p. 153.
A. Inoue, H. Kimura, S. Sakai, and T. Masumoto, in the Proceedings of the International Conference on Titanium, Kyoto, Japan, May 1980 (The Metallurgical Society, Warrendale, PA, 1980), p. 1137.
J. L. Murray, in Binary Alloy Phase Diagrams, edited by T. B. Massalski, J. L. Murray, L. H. Bennett, and H. Baker (American Society for Metals, Metals Park, OH, 1986), Vol. 1, p. 175.
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Huang, S.C., Hall, E.L. & Gigliotti, M.F.X. Rapidly solidified Al3Ti-base alloys containing Ni. Journal of Materials Research 3, 1–7 (1988). https://doi.org/10.1557/JMR.1988.0001
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DOI: https://doi.org/10.1557/JMR.1988.0001