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The purpose of the present study was to develop a wear-resistant, light Al-Al 3 Ti composite material. An Al-Al 3 Ti composite specimen was machined from a thick-walled tube of Al-Al 3 Ti functionally graded material (FGM) manufactured by the centrifugal method from a commercial ingot of Al-5 mass pct Ti master alloy. The alloy was heated to a temperature where solid Al 3 Ti particles resided in a liquid Al matrix, and then the centrifugal method was carried out. Al 3 Ti particles in a commercial alloy ingot exist as platelets, and this shape was maintained through the casting. Three kinds of wear specimens were prepared, taking into account the morphology of the Al 3 Ti particles in the thickwalled FGM tube; the Al 3 Ti particles were arranged with their platelet planes nearly normal to the radial direction as a result of the applied centrifugal force. The wear resistance of the Al-Al 3 Ti composite was significantly higher than that of pure Al. Wear-resistance anisotropy and dissolution of the Al 3 Ti into the Al matrix at the near-surface region, around 100 m in depth, were also observed. The mechanism of the supersaturated-layer formation and the origin of the anisotropic wear resistance are discussed.

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