H. Y. Lee, S. H. Jung, S. Y. Lee, K. H. Ko, Ajou University, Suwon 443 749, South Korea

Summary: The Al-Ti, Al-Ni mixed powders were successfully coated by cold gas dynamic spray process (CDSP) and alloying behaviors of films after post-annealing were investigated. The particles were accelerated through a standard de Laval type of nozzle with 120psi (prior to enter). Instead of conventional He gas, the air was used as particle carrying gas. The as-purchased power size of Al, Ti, Ni, was 77­, 44­, and 3­ microns, respectively. The composition of Ti and Ni was varied from 10 and 30 wt%. The coated films were annealed at 600~630¡É in air or N2 atmosphere for 3 hrs. It was observed that Ni and Ti particles were finely dispersed and imbedded densely in Al matrix. After post-annealing of Al-Ti and Al-Ni films, alloy phases such as the Al3Ti and Al3Ni phase were formed in the films.