Introduction of scandium, zirconium and hafnium into aluminum alloys. Dispersion hardening of intermetallic compounds with nanodimensional particles

The state of intermetallic compounds Al$_{3}$Sc, Al$_{3}$Zr, Al$_{3}$Hf and slag shots introduced by high-temperature exchange reactions of corresponding fluoride-chloride salts with liquid aluminum has been studied. The particle size and segregation direction during centrifugation and fi ltration of melt have been examined by microscopy and local X-ray analysis methods. The dispersoids formed during decomposition of solid solution are strong phase reinforcers.