Abstract
In the present research, dense γ-TiAl based intermetallic samples were fabricated by reactive synthesis of fully dense elemental 50 at. pct Al-50 at. pct Ti powder blends. Two different processing routes were attempted: thermal explosion under pressure (combustion consolidation) and reactive hot pressing. In both approaches, relatively low processing or preheating temperatures (900 °C) were used. The entire procedure of thermal explosion under pressure could be performed in open air without noticeable oxidation damage to the final product. The application of a moderate external pressure (≤250 MPa) during synthesis was shown to be enough to accommodate the negative volume change associated with TiAl formation from the elemental components and, thereby, to ensure full density of the final product. Microstructure and phase composition of the materials obtained were characterized employing X-ray diffraction and scanning electron microscopy with energy dispersive analysis. It was found that at elevated temperatures(e.g., 900 °C), the equiatomic 50Al-50Ti alloy lies beyond the homogeneity range of the y-TiAl phase in the Ti-Al binary and contains, in addition to γ-TiAl, Al-rich Ti3Al. Mechanical properties of the materials synthesized were evaluated in compression tests at different temperatures and by microhardness measurements. Due to its very fine microstructure, the Ti-Al material synthesizedvia reactive hot pressing exhibited superplastic behavior at temperatures as low as 800 °C.
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S. Sen and D.M. Stefanescu:JOM, 1991, vol. 45 (5), pp. 30–34.
F.M. Froes and R.G. Rowe: inTitanium Rapid Solidification Technology, F.H. Froes and D. Eylon, eds., TMS-AIME, Warrendale, PA, 1986, pp. 1–19.
R. Sundarsen and F.M. Froes:Met. Powder Rep., 1989, vol. 19, pp. 195–200.
E.Y. Gutmanas:Progr. Mater. Sci., 1990, vol. 34, pp. 261–366.
S. Oshiai, M. Yagihashi, and S. Osamura:Intermetallics, 1994, vol. 2, pp. 1–7.
A.G. Merzhanov and I.P. Borovinskaya:Dokl. Akad. Nauk SSSR, 1972, vol. 204 (2), pp. 429–32.
Z.A. Munir:Ceram. Bull., 1988, vol. 67 (2), pp. 342–49.
D.E. Alman, J.A. Hawk, A. Petty, Jr., and J.C. Rawers:JOM, 1994, Mar., pp. 31–35.
D.C. Dunand:Mater. Manufact. Proc, 1995, vol. 10, pp. 373–403.
W. Misiolek and R.M. German:Mater. Sci. Eng. A, 1991, vol. 144, pp. 1–10.
G.X. Wang and M. Dahms:Metall. Trans. A, 1993, vol. 24A, pp. 1517–26.
J.C. Rawers and W.R. Wrzesinski:J. Mater. Sci., 1992, vol. 27, pp. 2877–86.
K. Taguchi, M. Ayada, K.N. Ishihara, and P.H. Shingu:Intermetallics, 1995, vol. 3, pp. 91–98.
H.E. Maupin and J.C. Rawers:J. Mater. Sci. Lett., 1993, vol. 12, pp. 165–67.
H.E. Maupin and J.C. Rawers:J. Mater. Sci. Lett., 1993, vol. 12, pp. 540–41.
J.C. Rawers and H.E. Maupin:J. Mater. Sci. Lett., 1993, vol. 12, pp. 637–39.
A. Jacob and M.O. Speidel:Mater. Sci. Eng. A, 1994, vol. 189, pp. 129–36.
E.Y. Gutmanas:Powder Met. Int., 1983, vol. 15, pp. 129–32.
E.Y. Gutmanas: inNew Materials by Mechanical Alloying Techniques, DGM Informationgesellschaft Verlag, Oberursel, 1989, pp. 129–42.
E.Y. Gutmanas, I. Gotman, L. Farber, and E. Paransky:PM’93 Powder Metallurgy World Congr., Japan Society of Powder and Powder Metallurgy, Kyoto, Japan, 1993, pp. 1148–51.
E.Y. Gutmanas, L. Farber, I. Gotman, G. Petzow, and M. Bohsman:End of Term Coll., German-Israeli Cooperation/Materials Research, H.-J. Clar, ed., KFA, Julien, 1995, pp. 12–36.
L. Farber, E.Y. Gutmanas, I. Gotman, and M.J. Koczak:Metall. Mater. Trans. A, 1996, vol. 27A, pp. 2140–50.
A.H. Chokshi and A.K. Mukherjee:Mater. Sci. Eng. Rev., 1993, vol. R10, pp. 237–74.
R.M. Imayev and V.M. Imayev:Scripta Metall. Mater., 1991, vol. 25, pp. 2041–46.
O. Botstein, E.Y. Gutmanas, and D. Zak:Horizons of Powder Metallurgy, Verlag Schmid, Freiburg, Germany, 1986, pp. 961–65.
B.D. Cullity:Elements of X-ray Diffraction, Addison-Wesley Publishing Co., Reading, MA, 1978.
G.E. Dieter:Mechanical Metallurgy, 3rd ed., McGraw-Hill, New York, NY, 1986, pp. 295–301.
H.R. Ogden, D.J. Maykuth, W.L. Finlay, and R.I. Jaffe:Trans. AIME, 1951, vol. 155, pp. 1150–55.
E. Ence and H. Margolin:Trans. AIME, 1961, vol. 221, pp. 151–57.
J.L. Murray: inBinary Alloy Phase Diagrams, T.B. Massalsky, ed., ASM, Metals Park, OH, 1986, vol. 1, pp. 173–76.
S.C. Huang and P.A. Siemers:Metall. Trans. A, 1989, vol. 20A, pp. 1899–1906.
S.C. Cheng, J. Wolfenstine, and O.D. Sherby:Metall. Trans. A, 1991, vol. 22A, pp. 1509–13.
D. Eylon, CF. Yolton, H. Clemens, P. Schretter, and P.E. Jones:P/M 94 World Congr., Paris, Les Editions de Physique, Les Ulis, 1994, vol. II, pp. 1271–75.
Shyh Chin Huang and Ernest L. Hall:Metall. Trans. A, 1991, vol. 22A, pp. 427–39.
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Formarly with the Department of Materials Engineering, Drexel University.
This article is based on a presentation made in the “In Situ Reactions for Synthesis of Composites, Ceramics, and Intermetallics” symposium, held February 12–16, 1995, at the TMS Annual Meeting in Las Vegas, Nevada, under the auspices of SMD and ASM-MSD (the ASM/TMS Composites and TMS Powder Materials Committees).
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Paransky, E., Gutmanas, E.Y., Gotman, I. et al. Pressure-assisted reactive synthesis of titanium aluminides from dense 50Al-50Ti elemental powder blends. Metall Mater Trans A 27, 2130–2139 (1996). https://doi.org/10.1007/BF02651868
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DOI: https://doi.org/10.1007/BF02651868