Abstract
Three materials containing Nb, Cr, and Ti were fabricated by consolidating powders made by mechanical alloying. The Nb/Ti ratio was maintained at about 1.3 and Cr was increased to form the intermetallic Cr2Nb. X-ray diffraction, metallography, and transmission electron microscopy were used to thoroughly characterize the microstructure and substructure of the materials. Fatigue and fracture toughness properties were also evaluated at ambient temperature. The alloyed powders contained only small amounts of intermetallic, but during the consolidation heat treatment, two of the materials precipitated large volume fractions of Cr2Nb. In the third material, Cr2Nb was precipitated by heat treatment, although this was not expected from the composition based on the Nb-Cr-Ti phase diagram. Maximum fracture toughness of the composutes was ≈ 11 MPa √m. The low fracture toughness was attributed to the high plastic constraint of matrix deformation by the Cr2Nb and compositional change in the matrix.
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D.L. Davidson, K.S. Chan, and D.L. Anton: Metall. Mater. Trans. A, 1996, vol. 27A, pp. 3007–18.
D.M. Shah and D.L. Anton: Mater. Sci. Eng., 1992, vol. A153, pp. 402–09 and 410–15.
K.S. Chan: Metall. Mater. Trans. A, 1996, vol. 27A, pp. 2518–31.
K.S. Chan, D.L. Davidson, and D.L. Anton: Metall. Mater. Trans. A, 1997, vol. 28A, pp. 1797–1808.
D.L. Davidson and R.C. McClung: Int. J. Fract., 1997, vol. 84, pp. 81–98.
D.L. Davidson: Int. J. Fract., 1999, vol. 96, pp. 359–70.
C.C. Koch: Mater. Sci. Eng. A, 1998, vol. A 244, pp. 39–48.
K.S. Kumar and S.K. Mannan: Materials Research Society Symposia Proceedings, Materials Research Society, Pittsburgh, PA, 1989, vol. 133, pp. 415–20.
D.J. Thoma: Ph.D. Dissertation, University of Wisconsin, Madison, WI, 1992, available from University Microfilms International, Ann Arbor, MI.
D.L. Davidson, P.J. Masiasz, and J.W. Jones: Metall. Mater. Trans. A, 2001, vol. 32A, pp. 1023–27.
J.W. Edington: Mechanical Behavior of Materials under Dynanic Loads, U.S. Lindholm, ed., Springer-Verlag, New York, NY, 1968, pp. 191–240.
E.A. Franke, D.J. Wenzel, and D.L. Davidson: Rev. Sci. Instrum. 1990, vol. 62, pp. 1270–79.
D.L. Davidson, K.S. Chan, R. Loloee, and M.A. Crimp: Metall. Mater. Trans. A, 2000, vol. 31A, pp. 1075–84.
D.L. Davidson and J. Lankford: Int. Mater. Rev., 1992, vol. 37, pp. 45–76.
J.W. Martin: Micromechanisms in Particle-Hardened Alloys, Cambridge University Press, Cambridge, United Kingdom, 1980, p. 43.
F. Laves: Theory of Alloy Phases, ASM, Cleveland, OH, 1956, p. 131.
C.T. Liu, P.F. Tortorelli, J.A. Horton, and C.A. Carmichael: Mater. Sci. Eng., 1996, vol. 214, pp. 23–32.
R.L. Fleischer and R.J. Zabala: Metall. Trans. A, 1990, vol. 21A, pp. 2149–54.
V.K. Sikka, S. Viswanathan, and E.A. Loria: Superalloys 1992, S.D. Antolovich, R.W. Strusrud, R.A. MacKay, D.L. Anton, T. Khan, R.D. Kissinger, and D.L. Klarstrom, eds., TMS, Warrendale, PA, 1992, pp. 423–31.
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Davidson, D.L., Chan, K.S. Microstructural and fracture characterization of Nb-Cr-Ti mechanically alloyed materials. Metall Mater Trans A 33, 401–416 (2002). https://doi.org/10.1007/s11661-002-0101-x
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DOI: https://doi.org/10.1007/s11661-002-0101-x