Abstract
Refractory silicides with transition metals are of interest as structural materials operating at very high temperatures to improve energy efficiency. MoSi{sub 2} is particularly attractive because of its high melting point (2,030 C), relatively low density (6.24 g/cm{sup 3}), superior oxidation resistance and high thermal conductivity. Nevertheless, MoSi{sub 2} still has several problems which must be overcome before structural application. In this paper an attempt to improve the ductility, toughness and high-temperature strength of C40-based MoSi{sub 2} silicides was made by controlling additional Al and Zr contents in order to change the ductility, species of the constituent phase and the volume fraction of each phase.
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