Abstract
A composite of Fe-28Al-2Cr-lTi (at. pct) reinforced with 20-@#@ μm diameter zirconia-toughened alumina fiber, PRD-166, was pressure cast and examined by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). A new phase, tentatively identified as Fe2AlZr, with an fcc crystal structure and a lattice parameter of 1.18 nm was occasionally found at fiber/ matrix interfaces. It was proposed that the phase formed by the eutectic reaction L → Fe(Al) + Fe2AlZr. The Zr in the compound became available as a result of the dissolution of ZrO2 from the fiber into the molten alloy. The matrix contained a high density of dislocations resulting from a difference in the coefficients of thermal expansion between the matrix and fiber. It was proposed that dislocations which formed at high temperatures in either A2 or B2 states were incompatible with the low-temperature DO3 state. Geometrically necessary antiphase boundaries have been proposed to provide compatibility between dislocations formed in either the A2 or B2 states and the DO3 state.
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M.G. Mendiratta, S.K. Ehlers, D.K. Chatterjee, and H.A. Lipsitt:Metall. Trans. A, 1987, vol. 18A, pp. 283–91.
N.S. Stoloff:High-Temperature Ordered Intermetallic Alloys, Materials Research Society Symposia Proceedings, C.C. Koch, CT. Liu, and N.S. Stoloff, eds., Materials Research Society, Pittsburgh, PA, 1985, vol. 39, pp. 3–27.
C G. McKamey, J.A. Horton, and C.T. Liu:Scripta Metall., 1988, vol. 22, pp. 1679–81.
A. Bose and A.M. German:Adv. Mater. Manu. Proc, 1988, vol. 3, pp. 37–56.
S.F. Baumann, P.K. Brindley, and S.D. Smith:Metall. Trans., 1990, vol. 21A, pp. 1559–69.
J.C. Romine:Ceramic Engineering and Science Proceedings, American Ceramic Society, Westerville, OH, 1987, vol. 8, pp. 755–65.
S. Nourbakhsh, F.L. Liang, and H. Margolin:J. Mater. Sci. Lett., 1989, vol. 8, pp. 1252–54.
S. Nourbakhsh, F.L. Liang, and H. Margolin:Adv. Mater. Manu. Proc, 1988, vol. 3, pp. 57–78.
S. Nourbakhsh, F.L. Liang, and H. Margolin:J. Phys. E, 1988, vol. 21, pp. 898–902.
M.J. Marcinkowski and N. Brown:J. Appl. Phys., 1962, vol. 33, pp. 537–52.
P.R. Swann, W.R. Duff, and R.M. Fisher:Trans. AIME, 1969, vol. 245, pp. 851–53.
H. Okamoto and P.A. Beck:Metall. Trans., 1971, vol. 2, pp. 569–74.
S.M. Allen and J.W. Cahn:Acta Metall., 1975, vol.23, pp. 1017–26.
S.M. Allen and J.W. Cahn:Acta Metall., 1976, vol. 24, pp. 425–37.
M.G. Mendiratta and H.A. Lipsitt:High-Temperature Ordered Intermetallic Alloys, Materials Research Society Symposia Proceedings, C.C. Koch, C.T. Liu, and N.S. Stoloff, eds., Materials Research Society, Pittsburgh, PA, 1985, vol. 39, pp. 155–62.
S. Nourbakhsh, F.L. Liang, and H. Margolin:Metall. Trans. A, 1989, vol. 20A, pp. 2159–66.
S. Nourbakhsh, H. Margolin, and F.L. Liang:Metall. Trans. A, 1990, vol. 21A, pp. 213–19.
R.W. Clarck and J.D. Whittenberger:Thermal Expansion, T.A. Hahn, ed., Plenum Press, New York, NY, 1984, pp. 189–96.
M.J. Marcinkowski and N. Brown:acta Metall., 1961, vol. 9, pp. 764–86.
T.B. Massalski:Binary Alloy Phase Diagram, ASM, Metals Park, OH, 1986, vol. 2, pp. 1125 and 1129.
P. Villars and L.D. Calvert:Pearson’s Handbook of Crystallo-graphic Data for Intermetallic Phases, ASM, Metals Park, OH, 1985, vol. 3, p. 2249.
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Nourbakhsh, S., Margolin, H. & Liang, F.L. Microstructure of a pressure-cast Fe3AI intermetallic alloy composite reinforced with zirconia-toughened alumina fibers. Metall Trans A 21, 2881–2889 (1990). https://doi.org/10.1007/BF02647208
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DOI: https://doi.org/10.1007/BF02647208