Formation and wear behaviors of in-situ Al₃Ti/Al composites using aluminum and titanium fibers under electromagnetic induction heating

Abstract

Under various electromagnetic induction heating powers, different Al₃Ti/Al composites were fabricated by in-situ synthesis method from aluminum and titanium fibers. Microstructures and particles distribution of the composites were examined by XRD, SEM and EDS. The results show that no other intermetallic compounds beside Al₃Ti can be in-situ synthesized. Around the titanium fibers, the reaction zones and diffusion zones can be obviously found. Due to the stirring of the electromagnetic function, the formation of the micro-cracks inside the reaction zone was conducive to the peeling off of the Al₃Ti particles, and ensures the continuous reaction between liquid aluminum and titanium fibers, as well as the diffusion of Al₃Ti particles. At the same time, there were secondary splits of Al₃Ti particles located in diffusion zones. Two-body abrasion test shows that with the increase of induction heating power, the wear rates of the composites reduced and the number of grooves decreased.

Keywords

in-situ synthesis / induction heating / Al₃Ti intermetallic / particle distribution / wear behaviors

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