Mechanical Alloying Process of Mixture of Al-Cu-Ti Powders

Abstract

Mixture of aluminum, copper and titanium powders was mechanically alloyed and then the powder was heat-treated at various temperature. A change of structure of the powder with milling period was investigated by using XRD, DTA, SEM and EPMA. In the early stage of mechanical alloying, particles of Cu and Ti are deformed and dispersed in Al matrix, but degree of deformation of Ti particle is smaller than that of Cu particle.
Particles of Cu and Ti become finer with the increasing of milling period, and they disperse homogeneously as the milling period reaches to 72.0ks. Intermetallic Al₂Cu phase was observed in the powder mechanically alloyed for 21.6ks. In the powder heattreated at 773K intermetallic Al₃Ti and AlCu phases were observed. The forming temperature of Al₃Ti and AlCu phase decrease with the increasing of milling period.
Intermetallic AlTi phase was observed at low temperature in the powder mechanically alloyed for 72.0ks.