Abstract
Mo(Si,Al)2 alloy was prepared by reactive hot pressing at low temperatures for a short time under 20MPa in a vacuum using MoSi2, Mo and Al as starting powders. At 1160 °C, 5 min of soaking time was enough to obtain a high density alloy. At 1060 °C, however, 10min was needed. The formation of Mo(Si,Al)2 was accompanied by the melting of aluminum and controlled by the dissolution of molybdenum into the aluminum melt. It was proposed that the oxygen present in MoSi2 raw powder would react with aluminum and form Al2O3 in an amorphous or poor crystallization state. The mechanical properties of the alloy were a little stronger than those of monolithic MoSi2 alloy. The formed Al2O3 particles acted as crack-pinning elements, but a large toughening effect could not be obtained by this crack-pinning because of the strong interface bonding and the similar thermal expansion coefficients of Mo(Si,Al)2 and Al2O3.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. Stergiou, P. Tsakiropoulos and A. Brown, Intermetallics 5 (1997) 69.
K. Yanagihara, T. Maruyama and K. Nagata, ibid. 4 (1996) S133.
A. G. Evans and E. A. Charles, J. Amer. Ceram. Soc. 59 (1976) 371.
T. B. Massalski, H. Okamoto, P. R. Subramanian, and L. Kacprzak (editors), in "Binary Alloy Phase diagrams," 2nd Edn (The Materials Information Society, 1990, printed in the USA), p. 175 and p. 212.
G. J. Zhang, X. M. Yue and T. Watanabe, accepted, J. Mater. Sci. (1998).
Rights and permissions
About this article
Cite this article
Zhang, GJ., Yue, XM. & Watanabe, T. Synthesis of Mo(Si,Al)2 alloy by reactive hot pressing at low temperatures for a short time. Journal of Materials Science 34, 593–597 (1999). https://doi.org/10.1023/A:1004511232497
Issue Date:
DOI: https://doi.org/10.1023/A:1004511232497