Abstract: Al-Ti composites were fabricated by friction stir processing (FSP), and then post-treated at 600 ℃/6 h. The microstructures and phases of the friction zone were analyzed by SEM, TEM and XRD. The lattice constant of the phase before and after the heat treatment was measured by X-ray diffraction analysis software TOPAS. The microstructure of Al-Ti composites prepared by friction stir processing were studied at the effects of post-heat treatment. The results show that the intermetallic compound has a good interface with aluminum base after 600 ℃/6 h post heat treatment; the interdiffusion between Ti, Al and Al3Ti can be accele-rated by the post-heat treatment, which can promote the formation of Al3Ti and new phase Al5Ti2 intermetallic compounds. In addition, there exists dislocations walls in the microstructure. The axial ratios of Al3Ti c/a before and after heat treatment are higher than standard data, but the degree of change after heat treatment is about 0.4%, which is obviously lower than that of 1.2% before heat treatment. After the heat treatment, the proliferation, re-diffusion and interaction of the micro-defects caused by the friction stir processing of the Al-Ti composite material cause the in-situ reaction to proceed again, which promotes the increase of the intermetallic compound content in the friction stir zone.
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2018, Vol. 32 
