A study of Al-Mo alloys synthetized by mechanical treatment and annealed in-situ.

Al75Mo25 alloys were synthesised by ball milling of pure elements. The decrease of fcc aluminium peaks from the neutron diffraction patterns as a function of mechanical treatment time suggests the formation of an extended Mo(AI) solid solution, even though no significant change of the bcc lattice parameter is observed. Further evidence of the existence of a metastable phase is supplied a posteriori by in situ annealing of the processed metal powders at temperatures below 750 degrees C. The main product is the intermetallic Al8Mo3 compound.