Abstract
The effect of silicon in solid solution and in the form of suicides has been studied on the tensile properties and fracture behavior of alloy Ti-6Al-5Zr-0.5Mo-0.25Si (alloy 685). The heat treatment to hold silicon in solid solution consists of solutionizing at 1323 K for 0.5 hour under vacuum (∼10-5 MPa), followed by water quenching, and the treatment to precipitate suicides involves subsequent aging of the solutionized and water quenched specimens at 1073 K for 24 hours. There is only marginal effect of the aging treatment on strength values; however, the ductility parameters are found to be drastically reduced. There are marked differences in the fracture behavior of the alloy in the as-quenched and the quenched and aged conditions. While the fracture surface of the unaged specimen shows characteristic dimples, there is a large number of facets on the fracture surface of the aged specimen. The facets in the central region are relatively smaller in size than those in the peripheral zone. The central facets show fluted features at higher magnifications; however, the peripheral facets are usually featureless. The faceted fracture in the aged condition is attributed to enhanced tendency for heterogeneous planar slip. The fracture characteristics correlate with the observed differences in the ductility in the two conditions.
Similar content being viewed by others
References
W. P. Fentiman, R. E. Goosey, R.T.J. Hubbard, and M. D. Smith:The Science, Technology and Application of Titanium, Pergamon Press, 1970, pp. 987–99.
S.R. Seagle and H. B. Bomberger:The Science, Technology and Application of Titanium, Pergamon Press, 1970, pp. 1001–08.
H. M. Flower, P. R. Swann, and D. R. F. West:Titanium Science and Technology, R. I. Jaffee and H. M. Burte, eds., Plenum Press, New York, NY, 1973, vol. 2, pp. 1143–54.
M. Kehoe and R. W. Broomfield:Titanium Science and Technology, R.I. Jaffee and H. M. Burte, eds., Plenum Press, New York, NY, 1973, vol. 4, pp. 2167–78.
M. R. Winstone, R.D. Rawlings, and D. R.F. West:J. of Less- Common Metals, 1975, vol. 39, pp. 205–17.
Y. Imbert:J. of Less-Common Metals, 1974, vol. 37, pp. 71–89.
N. E. Paton and M. W. Mahoney:Metall. Trans. A, 1976, vol. 7A, pp. 1685–94.
A. T. K. Assadi, H. M. Flower, and D. R. F. West:Metals Technology, Jan. 1979, pp. 16–23.
M.W. Mahoney and N.E. Paton:Metall. Trans. A, 1978, vol. 9A, pp. 1497–501.
H. M. Flower, P. R. Swann, and D. R. F. West:J. of Materials Sci., 1972, vol. 7, pp. 929–38.
H. M. Flower, P. R. Swann, and D. R. F. West:Metall. Trans., 1971, vol. 2, pp. 3289–97.
A. T. K. Assadi, H. M. Flower, and D. R. F. West:Metals Technology, Jan. 1979, pp. 8–15.
H. M. Flower, K. Lipscombe, and D. R. F. West:J. of Materials Sci., 1982, vol. 17, pp. 1221–31.
C. Ramachandra and Vakil Singh:Metall. Trans. A, 1982, vol. 13A, pp. 771–75.
D. Hoeppner:Metallography, 1978, vol. 11, pp. 129–54.
D. Eylon, J. A. Hall, C.M. Pierce, and D. L. Ruckle:Metall. Trans. A, 1976, vol. 7A, pp. 1817–26.
D. Eylon and J. A. Hall:Metall. Trans. A, 1977, vol. 8A, pp. 981–90.
J.C. Chesnutt, C.G. Rhodes, and J.C. Williams:Fractography- Microscopic Cracking Processes, ASTM STP 600, ASTM Publica- tion, Philadelphia, PA, 1976, pp. 99–138.
D. Banerjee, D. Mukherjee, R. L. Saha, and K. Bose:Metall. Trans. A, 1983, vol. 14A, pp. 413–20.
G.R. Yoder, L. A. Cooley, and T. W. Crooker:Metall. Trans. A, 1977, vol. 8A, pp. 1737–43.
D. Eylon:Metall. Trans. A, 1979, vol. 10A, pp. 311–17.
C. C. Wojcik: M.Sc. Thesis, Michigan Technological University, Houghton, MI, 1977.
D. L. Davidson:Fatigue Mechanisms, Proceedings of an ASTM- NBS-NSF Symposium, Kansas City, MO, ASTM STP 675, J.T. Fong, ed., ASTM Publication, Philadelphia, PA, 1978, pp. 254–75.
D.L. Davidson and D. Eylon:Metall. Trans. A, 1980, vol. UA, pp. 837–43.
D. Schechtman and D. Eylon:TMS-AIME Meeting Abstract Book, St. Louis, MO, 1978, p. 9.
D. Schechtman and D. Eylon:Metall. Trans. A, 1978, vol. 9A, pp. 1018–20.
D. Eylon and P. J. Bania:Metall. Trans. A, 1978, vol. 9A, pp. 1273–79.
W.J. Evans and C.R. Gostelow.Metall. Trans. A, 1979, vol. 10A, pp. 1837–46.
J. E. Hack and G. R. Leverent:Scr. Metallurgica, 1980, vol. 14, pp. 437–41.
D. F. Neal:Forging and Properties of Aerospace Materials, Chame- leon Press, London, The Metals Society, 1978, pp. 199–216.
J.C. Chesnutt and J.C. Williams:Metall. Trans. A, 1977, vol. 8A, pp. 514–15.
J.C. Williams and G. Luetjering:Titanium’80, Science and Technology, H. Kimura and D. Ozami, eds., TMS-AIME, New York, NY, 1980, vol. 1, pp. 671–81.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ramachandra, C., Singh, V. Effect of silicide precipitation on tensile properties and fracture of alloy Ti-6Al-5Zr-0.5Mo-0.25Si. Metall Trans A 16, 227–231 (1985). https://doi.org/10.1007/BF02816049
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02816049