Creep rupture of a silicon carbide reinforced aluminum composite

Springer Science and Business Media LLC - Tập 15 - Trang 139-146 - 1984
T. G. Nieh1
1Lockheed Palo Alto Research Laboratory, Lockheed Missiles and Space Company, Inc., Palo Alto

Tóm tắt

The microstructure, texture, and whisker orientations in 6061 Al-20 wt pct SiC whisker composites have been examined using transmission electron microscopy and X-ray diffraction. Tension creep tests of the composite material have also been conducted in the temperature range 505 to 644 K (450 to 700 F). The steady state creep rate of the composite depends strongly on the temperature and applied stress. The stress exponent for the steady state creep rate of the composite is approximately 20.5 and remains essentially constant within the range of test temperatures. The activation energy is calculated to be 390 kJ/mol, nearly three times as high as the activation energy for self-diffusion of aluminum. No threshold stress was observed. Fracture surface examination using scanning electron microscopy shows that the composite fails by coalescence of voids in the aluminum matrix which originate at the aluminum-SiC interface. It is demonstrated that SiC paniculate composites are less creep resistant than SiC whisker composites.

Tài liệu tham khảo

H. Landis, J. Unnam, S.V.N. Naidu, and W. Brewer:SAMPE Quarterly, 1981, vol. 12, no. 7, pp. 19–23.

S. Kohara: “Composite Materials”,Proc. Japan-U.S. Conf., Tokyo (1981), K. Kawata and T. Akasaka, eds., Japan Society for Composite Materials, Tokyo, Japan, 1981, pp. 224–31.

T.G. Nieh and R.F Karlak:Abstract Book, Westec Conf., Los Angeles, CA, March 22–25, 1982, ASM, Metals Park, OH, 1982, p. 45.

R.J. Lederich, S.M.L. Sastry, J.E. O’Neal, and C.R. Whitsett: “Superplastic Forming of Structural Alloys”,Symposium Proceedings, San Diego, CA, June 21–24, 1982, N. E. Paton and C. H. Hamilton, eds., TMS-AIME, Warrendale, PA, 1982, p. 403.

R. F. Karlak and T. G. Nieh: Independent Research and Development Program, Lockheed Missiles & Space Company, Inc., LMSC-D811899, Lockheed Missiles & Space Company, Sunnyvale, CA, March 1982.

J.-G. Lee and I. B. Cutler:Ceram. Bull., 1975, vol. 54, no. 2, pp. 195–98.

D. J. Chellman, T. K. Mukerji, and P.E. Hood: Presented at 111th AIME Annual Meeting, Dallas, TX, February 14–18, 1982.

A. P. Divecha and S. G. Fishman:SAMPE Quarterly, 1981, vol. 12, no. 4, pp. 40–42.

A. P. Divecha, S. G. Fishman, and S.D. Karmarkar:J. of Metals, 1981, vol. 33, no. 9, pp. 12–17.

D. Webster:Metall. Trans. A, 1982, vol. 13A, pp. 1511–19.

T. G. Nieh: Ph.D. Dissertation, Stanford University, Stanford, CA, 1980.

M. Neuberger, H.K. Henisch, and R. Roy, eds.,Mat. Res. Bull., Pergamon Press, Inc., 1969, vol. 4, pp. S365-S370.

F. H. Hubbard:J. Mater. Sci. Letter, 1982, vol. 1, pp. 131–32.

P. E. Hood: unpublished data, Arco Metals Company, Silag Operation, Rt. 6, Box A, Greer, SC 29651.

S. Shinozaki and K. R. Kinsman:Acta Metall., 1978, vol. 27, pp. 769–76.

R.J. Arsenault and R.M. Fisher:Scripta Metall., 1983, vol. 17, p. 67.

G. S. Ansell and J. Weertman:Trans. TMS-AIME, 1959, vol. 215, pp. 838–43.

W. C. Oliver and W. D. Nix:Acta Metall., 1982, vol. 30, pp. 1335–47.

J.H. Hausselt and W. D. Nix:Acta Metall., 1977, vol. 25, pp. 1491–1502.

R. W. Lund and W. D. Nix:Acta Metall., 1976, vol. 24, p. 469.

B. A. Wilcox and A. H. Clauser:Trans. TMS-AIME, 1965, vol. 233, p. 253.

B. A. Wilcox and A. H. Clauser:Trans. TMS-AIME, 1966, vol. 236, p. 570.

D.J. Srolovitz, R. Petkovic-Luton, and M. J. Luton: “The Threshold Stress for Dislocation Creep in Dispersion Strengthened Systems”, presented at 112th AIME Annual Meeting, Atlanta, GA, March 6–10, 1983.

E. Orowan: Symposium on “Internal Stresses in Metals and Alloys”,Inst. of Metals, 1948, p. 451.

A.J.E. Foreman and M. J. Makin:phil. Mag., 1966, vol. 14,p. 911.

J. Weertman:J. Appl. Phys., 1955, vol. 26, p. 1213.

A.N. Stroh:Proc. Phys. Soc., 1954, vol. B67, p. 427.

G. Schoeck:Creep and Recovery, ASM, Cleveland, OH, 1957.

R.S.W. Shewfelt and L. M. Brown:Phil. Mag., 1974, vol. 30, p. 1135.

R.S.W. Shewfelt and L.M. Brown:Phil. Mag., 1977, vol. 35, p. 945.

R. Langeborg:Inst. Met. Rev., 1972, vol. 17, p. 130.

D. McLean: Report on Progress in Physics, 1966, vol. 29, p. 1.

W.R. Cannon and O.D. Sherby:Metall. Trans., 1970, vol. 1, p. 1030.

K. Murty, F. A. Mohamed, and J.E. Dorn:Acta Metall., 1972, vol. 20, p. 1009.

O. D. Sherby and P. M. Burke:Progress in Mater. Sci., 1968, vol. 13, p. 325.

Aluminum Company of America,Aluminum, K. R. Van Horn, ed., ASM, Metals Park, OH, 1967, vol. 1, p. 350.

K.J. Bhansali and R. Mehrabian:J. of Metals, 1982, vol. 34, no. 9, pp. 30–34.

Thông tin
Thông tin xuất bản

Springer Science and Business Media LLC

Tập 15

139-146

Thông tin tác giả