Heat Treatment Behaviour of Metal Matrix Composites

  • Azmi Rahmat
  • Shamsul Baharin
  • P. R. Khangaonkar

Abstract

High performance composites on the basis of aluminium alloy matrix and alumina-silica continuous fibres were studied from the point of view of their response to age hardening treatment as compared to the unreinforced matrix alloy. The changes were monitored by following the microhardness of the matrix and the electrical resistivity of the materials examined. It was observed that the matrix of the composites showed considerably more hardening effect than the matrix of the unreinforced alloy inspite of the fibre being innert to the matrix alloy. The resistivity changes in the composites during the ageing process indicated that appreciable internal stress continued to persist in the composite material well after overageing and hardness decline took place. EDX evaluation of regions close to the fibres indicated a higher magnesium content as compared to the regions away from the fibres.

Keywords

Metal Matrix Composite High Dislocation Density Resistivity Change Squeeze Casting Unreinforced Alloy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. J. Arsenault, and R. M. Fisher, Microstructure of fiber and particulate SiC in 6061 Al composites, Scripta Metallurgica. 17:67–71 (1983).CrossRefGoogle Scholar
  2. 2.
    Y. Song and T.N. Baker, Accelerated aging response in ceramic reinforced AA 6061 composites, Materials Sci. Tech. 10:406–413 (1994).Google Scholar
  3. 3.
    M. Vogelsang, R. J. Arsenault, and R. M. Fisher, An in situ HVEM study of dislocation generation at Al/SiC interface in metal matrix composites, Met. Trans.A. 17A:379–389 (1986).CrossRefGoogle Scholar
  4. 4.
    M. B. House, K. C. Meinert, and R. B. Bhagat, The aging response and creep of DRA composites, Journal of Metals. 43(8): 24–28 (1991).Google Scholar
  5. 5.
    K. K. Chawla, and M. Metzger, Initial dislocation distributions in tungsten fibre/copper composites, J. Mat. Sci. 7: 34–39 (1972).CrossRefGoogle Scholar
  6. 6.
    Sumitomo Metal Co, Tokyo, Japan. “Altex Fibres, Product information”.Google Scholar
  7. 7.
    A.G. Guy, C.S. Barrett and R.F. Mehl, Age hardening in Copper Beryllium alloys, Trans. A.I.M.E. 175: 216 (1948).Google Scholar
  8. 8.
    J. B. Shamsul, N. Jomin, R. S. Bushby, and V. D. Scott, Fabrication, microstructure and ageing characteristics of aluminimum alloy (6061) reinforced with Altex fibre, in: “Proceedings of the International conference on Recent Advances in Materials and Mineral Resources,” Universiti Sains Malaysia, Penang, Malaysia, 212–221 (1994).Google Scholar
  9. 9.
    M. Yang and V. D. Scott,, Microstructural studies of aluminium-silicon alloy reinforced with alumina fibres, J. Mat. Sci. 26: 2245–2254 (1991).CrossRefGoogle Scholar
  10. 10.
    P.R. Khangaonkar, J.B. Shamsul, and R. Azmi, Age hardening of 6061/alumina silica fibre composites, in: “Symposium on High Performance Composites: Commonality of Phenomena,” K. K. Chawla, ed., TMS, Warrandale, PA USA, 435–443 (1994).Google Scholar
  11. 11.
    R. J. Arsenault, Strengthening of metal matrix composites due to dislocation generation through CTE mismatch, in: “Metal matrix composites: Mechanisms and Properties”, R. K. Everett and R. J. Arsenault, eds., The Academic Press, Boston MA):79–100 (1991).Google Scholar
  12. 12.
    C. M. Friend, I. Horsfall, S. D. Luxon, and R. J. Young, The effect of fibre matrix interfaces on the age hardening characteristics of б-alumina fibre reinforced AA6061, in: “Cast metal matrix composites”, S. G. Fishman and A. K. Dhingra, eds., ASM International: 309–315 (1988).Google Scholar
  13. 13.
    A. Badini, F. Marino, and A. Tomasi, Natural aging characteristics of aluminium alloy 6061 reinforced with SiC whiskers and particles, Material Science and Engineering, 136A:99–107 (1991).CrossRefGoogle Scholar
  14. 14.
    D. Srinivasan, and M. K. Surappa, Effect of iron impurity and thermomechanical processing on the age hardening behaviour of 6061 Al-SiCp MMC produced by casting route, Scripta Metallurgica et Materialia, 27:1139–1144 (1992).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Azmi Rahmat
    • 1
  • Shamsul Baharin
    • 1
  • P. R. Khangaonkar
    • 1
  1. 1.Perak Branch CampusUniversiti Sains MalaysiaTronohMalaysia

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