Abstract
Magnesium metal matrix composites (MMCs) have been receiving attention in recent years as an attractive choice for aerospace and automotive applications because of their low density and superior specific properties. This article presents a liquid mixing and casting process that can be used to produce SiC particulate-reinforced magnesium metal matrix composites via conventional foundry processes. Microstructural features, such as SiC particle distribution, grain refinement, and particle/matrix interfacial reactions of the cast magnesium matrix composites, are investigated, and the effects of solidification-process parameters and matrix alloys (pure Mg and Mg-9 pct Al-1 pct Zn alloy AZ91) on the microstructure are established. The results of this work suggest that in the solidification processing of MMCs, it is important to optimize the process parameters both to avoid excessive interfacial reactions and simultaneously achieve wetting, so that a good particle distribution and interfacial bonding are obtained. The tensile properties, strain hardening, and fracture behavior of the AZ91/SiC composites are also studied and the results are compared with those of the unreinforced AZ91 alloy. The strengthening mechanisms for AZ91/SiC composite, based on the proposed SiC particle/matrix interaction during deformation, are used to explain the increased yield strength and elastic modulus of the composite over the magnesium matrix alloy. The low ductility found in the composites is due to the early appearance of localized damages, such as particle cracking, matrix cracking, and occasionally interface debonding, in the fracture process of the composite.
Similar content being viewed by others
References
A. Mortensen and I. Jin:Int. Mat. Rev., 1992, vol. 37, pp. 101–28.
P.K. Rohatgi, R. Asthana, and S. Das:Int. Met. Rev., 1986, vol. 31, pp. 115–39.
P. Rohatgi and R. Asthana:JOM, 1991, vol. 43, pp. 35–41.
I. Jin and DJ. Lloyd: inProc. ASM Int. Conf. on Fabrication of Paniculate Reinforced Composites, J. Masounave and F.G. Hamel, eds., ASM International Metals Park, OH, 1990, pp. 47–52.
D.J. Lloyd, H.P. Lagace, and A.D. McLeod: inProc. Conf. Controlled Interphases in Composite Materials, H. Ishida, ed., Elsevier Sci. Pub. Co., New York, NY, U.S.A., 1990, pp 359–76.
D.J. Lloyd:Acta Metall. Mater., 1991, vol. 39, pp. 59–71.
Z. Wang and R.J. Zhang:Metall. Trans. A, 1991, vol. 22A, pp. 1585–93.
B.A. Mikuki, S.O. Shook, W.E. Mercer, II and W.G. Green: inProc. 43rd Annual World Magnesium Conf., International Magnesium Associations, McLean, VA, 1986, pp. 13–23.
D.L. Albright: inProc. 46th Annual World Magnesium Conf, International Magnesium Associations, McLean, VA, 1989, pp. 33–44.
A. Luo and M.O. Pekguleryuz: inProc. of 51st Annual World Magnesium Conf, International Magnesium Associations, McLean, VA, 1994, pp. 74–81.
J.F. King and T.E. Wilks: inProc. of 51st Annual World Magnesium Conf, International Magnesium Associations, McLean, VA, 1994, pp. 26–31.
A. Luo and M.O. Pekguleryuz:AFS Trans., 1994, vol. 102, 1994, pp. 313–320.
A. Stevenson:Metals Handbook, ASM International, Materials Park, OH, 1989, vol. 4, p. 899.
V. Laurent, P. Jarry, and G. Regazzoni:J. Mater. Sci., 1992, vol. 27, pp. 4447–59.
A. Luo:Scripta Metall. Mater., 1993, vol. 31, pp. 1253–58.
J. Lo, M.T. Shehata, G.J.C. Carpenter, A. Luo, and M.O. Pekguleryuz:Microstructural Science, 1995, vol. 22 (in press).
G.E. Dieter:Mechanical Metallurgy, 2nd ed., McGraw-Hill, New York, NY, 1976, pp. 329–48.
H. Lagance and D.J. Lloyd:Can. Metall. Q., 1989, vol. 28, pp. 145–52.
Z. Wang T.-K. Chen and D.J. Lloyd:Metall. Trans. A, 1993, vol. 24A, pp. 197–207.
P.M. Singh and J.J. Lewandowski:Metall. Trans. A, 1993, vol. 24A, pp. 2531–43.
S.F. Corbin and D.S. Wilkinson:Acta Metall. Mater., 1993, vol. 42, pp. 1329–35.
J. Llorca, A. Martin, J. Riuz, and M. Elicus:Metall. Trans. A, 1993, vol. 24A, pp. 1575–88.
D.S. Liu and J.J. Lewandowski:Metall. Trans. A, 1993, vol. 24A, pp. 609–15.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Luo, A. Processing, microstructure, and mechanical behavior of cast magnesium metal matrix composites. Metall Mater Trans A 26, 2445–2455 (1995). https://doi.org/10.1007/BF02671259
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02671259