Creep behaviour of three dispersion-strengthened Al-Fe-V-Si materials

Abstract

A large variety of aluminium alloys combine high strength and ductility, and applications in the aerospace industry. However, most of these alloys lose their good properties above 200 8C. The search for aluminium alloys with high temperature strength and ductility has been carried out in recent decades. These investigations consisted mainly of introducing oxides, which act as reinforcement, into aluminium. In recent years, work has focused on improving these properties by rapid solidifcation and powder metallurgical processing. Multicomponent alloys, such as Al-Fe-V-Si alloys, have been evaluated extensively with the objective of optimizing the composition and processing parameters for the best combination of properties. These alloys derive their good high temperature mechanical properties from a dispersion of one and stable precipitates, which form in the rapidly solidifed materials during casting. Recent investigations have used aluminium alloys containing carbide particles by means of powder metallurgy methods to improve the creep behaviour.