The effects of Ti content and the alloying elements of Si and Cu on the microstructures of casting in situ Al_3Ti-Al composites were investigated. Simultaneously, their corrosion properties were also discussed. The results indicate that the aspect ratios of Al_3Ti platelets in different Al based composites are different although all of them are in flaky shape. The morphologies of Al_3Ti phase are not only determined by Ti content, but are also related to the alloying elements. The grain refining role of Al_3Ti phase in the pure Al and Al-Cu based composites is more effective than that in the Al-Si based composite. The addition of Ti decreases the corrosion resistance of pure Al and Al alloys. The corrosion resistances of the composites are dependent on both the corrosion characteristics of the corresponding matrixes and the distribution of Al_3Ti platelets.
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