Abstract
An investigation was made to determine the effect of particulate loading on the elastic, tensile, compressive and fracture properties of Al2O3/Al metal-matrix composites fabricated by a pressureless-liquid-metal-infiltration process. The elastic modulus was found to be strongly affected by the reinforcement content, falling within the Hashin-Shtrikman bounds. The Young's modulus of the most highly loaded composite was 170 GPa; compare with 65 GPa for the unreinforced alloy. The strength systematically increased with loading, and the rate of increase also increased with loading. The measured yield strengths were nominally the same in both tension and compression; however, the composites possessed far greater ultimate strengths and strains-to-failure in compression than in tension. At 52 vol % reinforcement, yield strengths in tension and compression of 491 and 440 MPa, respectively, were measured, whereas the associated ultimate strengths were 531 and 1035 MPa, respectively. In tension, the yield and ultimate strengths of the base alloy were found to be 170 and 268 MPa, respectively. The composites displayed a nearly constant fracture toughness for all particulate loadings, with values approaching 20 MPa m1/2 compared to a value of 29 MPa m1/2 for the base alloy. Using fractography, the tensile-failure mechanism was characterized as transgranular fracture of the Al2O3 particles followed by ductile rupture of the Al-alloy matrix, with no debonding at the matrix/reinforcement interfaces.
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References
D. L. McDanels, Metall. Trans. A 16 (1985) 1105.
J. M. Papazian and P. N. Alder, ibid. 21 (1990) 401.
J. W. McCoy, C. Jones and F. E. Warner, SAMPE Q. 19(2) (1988) 37.
P. K. Ghosh and S. Ray, J. Mater. Sci. 21 (1986) 1167.
M. K. Aghajanian, J. T. Burke, D. R. White and A. S. Nagelberg, SAMPE Q. 20(4) (1989) 43.
M. K. Aghajanian, M. A. Rocazella, J. T. Burke and S. D. Keck, J. Mater. Sci. 26 (1991) 447.
S. Spinner and W. E. Tefft, ASME Proc. 61 (1961) 1221.
T. G. Nieh and D. J. Chellman, Scripta Metall. 18 (1984) 925.
D. G. Munz, J. L. Shannon and R. T. Bubsey, Int. J. Fracture 16 (1980) R137.
K. R. Brown, in “Chevron-notched specimens: testing and stress analysis, ASTM STP 855”, edited by J. H. Underwood, S. W. Freiman and F. I. Baratta (American Society for Testing and Materials, Philadelphia, 1984) pp. 237–54.
J. R. Willis, in “Mechanics of solids, Rodney Hill 60th anniversary Vol.”, edited by H. G. Hopkins and M. J. Sewell (Pergamon Press, Oxford, 1982) pp. 653–86.
J. C. Wang, J. Mater. Sci. 19 (1984) 801.
Idem. ibid. 19 (1984) 809.
Z. Hashin and S. Shtrikman, J. Mech. Phys. Solids 11 (1963) 127.
P. K. Rohatgi, S. Raman, B. S. Majumdar and A. Banerjee, Mater. Sci. Engng. A 123 (1990) 89.
R. J. Arsenault and S. B. Wu, ibid. 96 (1987) 77.
F. Girot, J. M. Quenisset, R. Naslain, B. Coutland and T. Macke, in Proceedings of the Sixth International Conference on Composite Materials and the Second European Conference on Composite Materials, London, UK, Vol. 2, edited by F. L. Matthews, N. C. R. Buske, J. M. Hodgkinson, and J. Morton (Elsevier Applied Science, London, 1987) pp. 330–9.
B. Roebuck, J. Mater. Sci. Lett. 6 (1987) 1138.
Z. Rosenberg, Y. Partom and Y. Yeshurun, J. Phys. D 15 (1982) 1137.
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Aghajanian, M.K., Langensiepen, R.A., Rocazella, M.A. et al. The effect of particulate loading on the mechanical behaviour of Al2O3/Al metal-matrix composites. JOURNAL OF MATERIALS SCIENCE 28, 6683–6690 (1993). https://doi.org/10.1007/BF00356415
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DOI: https://doi.org/10.1007/BF00356415