Fracture and Fatigue Behaviour of Mullite/Molybdenum Composites

Abstract:

Article Preview

The fracture and fatigue behaviour of a mullite/molybdenum composite is investigated. The attention is focused on the measurement of fracture toughness, KIc, on long through the thickness cracks by using SENB specimens, and on the growth of indentation cracks under static, monotonic and cyclic loads. Molybdenum was chosen to reinforce the mullite matrix because of the similar thermal expansion coefficients for both phases. It is essential to know and take into account the shape of the initial indentation cracks as well as the eccentricity change after extension under monotonic and cyclic stress. This study shows that, in mullite/molybdenum composites, static fatigue effects are negligible, but these composites are susceptible to mechanical degradation under cyclic loads. It is shown that the fatigue crack growth rate exhibits a high dependence on Kmax and that the fatigue sensitivity, defined as the ratio between fatigue crack growth rate threshold and KIc, is much lower than for other materials processed by powder metallurgy.

Info:

Periodical:

Edited by:

J. Dusza, R. Danzer and R. Morrell

Pages:

110-120

DOI:

10.4028/www.scientific.net/KEM.290.110

Citation:

Y. Torres Hernández et al., "Fracture and Fatigue Behaviour of Mullite/Molybdenum Composites", Key Engineering Materials, Vol. 290, pp. 110-120, 2005

Online since:

July 2005

Export:

Price:

$35.00

[1] T.W. Clyne and P.J. Withers: An introduction to Metal-Matrix Composites (Cambridge University Press, Cambridge 1993).

[2] T. Sekino and K. Niihara: J. Mater. Sci. Vol. 32 (1997), pp.3943-0, 0 0, 2 0, 4 0, 6 0, 8 1, 0 Metallic Alloys Intermetallic Cast Irons PM-Steels PM-HSS WC-Co Advanced Ceramics Mullite Mu/Mo Kth/KIc Fatigue sensitivity KIc (MPam 1/2 ) +.

[3] A.A. Khan and J.C. Labbe: J. Mater. Sci. Vol. 32 (1997), p.3829.

[4] Y. Naerheim: Powder Metall. Int. Vol. 18 (1986), p.158.

[5] Ch.S. Morgan, A. J. Moorhead and R. J. Lauf: Caram. Bull. Vol. 61 (1982), p.974.

[6] X. Sun and J. Yeomans: J. Am. Ceram. Soc. Vol. 79 (1996), p.2705.

[7] J. -L. Huang and Ch. H. Li: J. Mater. Res. Vol. 9 (1994), p.3153.

[8] D.V. Krstic: Phil. Mag. A Vol. 48 (1983), p.695.

[9] B.D. Flinn, M. Ruehle and A.G. Evans: Acta metal. Vol. 37 (1989), p.3001.

[10] J.F. Bartolomé, M. Díaz, J. Requena, J.S. Moya and A.P. Tomsia: Acta Mater. Vol. 47 (1999), p.3891.

[11] G.R. Anstis, P. Chantikul, B.R. Lawn and D.B. Marshall: J. Am. Ceram. Soc. Vol. 64 (1981), p.533.

[12] H. Iizuka and M. Tanaka: J. Mater. Sci. Vol. 26 (1991), p.4394.

[13] C.B. Ponton and R.D. Rawlings: Mater. Sci. Technol. Vol. 5 (1989), p.865.

[14] S.M. Smith and O. Scattergood: J. Am. Ceram. Soc. Vol. 75 (1992), p.305.

[15] J.C. Newman and I.S. Raju: Eng. Fract. Mech.: Vol. 15 (1981), p.185.

[16] M. Oore and D.J. Burns: J. Pressure Vessel Technol. Vol. 102 (1980), p.202.

[17] J.F. Bartolomé, M. Díaz. and J.S. Moya: J. Am. Ceram. Soc. Vol. 85 (2002), p.2778.

[18] D. Casellas, C. Baudin, M. Osendi, L. Llanes. and M. Anglada: Scripta Mater. Vol. 38 (1998), p.39.

[19] L. Llanes, Y. Torres, S. Rodríguez, M. Mateo and M. Anglada: in Euro PM2003 Conference Proceedings (EMPA, Spain 2003, Vol. 1, p.75).

[20] L. Llanes, Y. Torres and M. Anglada: M., Acta mater. Vol. 50 (2002), p.2381.

[21] R.O. Ritchie, C.J. Gilbert and J.M. McNaney: Int. J. Sol. Struct. Vol. 37 (2000), p.311.

[22] M.M. James and L. Wenfong: Mater. Sci. Eng. Vol. A265 (1999), p.129.

[23] Z. Shan and Y. Leng: Metall. Mater. Trans. A Vol. 30A (1999), p.2895.

[24] N. A. Fleck, K.J. Kang and M.F. Ashby: Acta metall. mater. Vol. 42 (1994), p.365.

In order to see related information, you need to Login.