The Microstructure and Properties in-situ TiB₂ Particulates Reinforced AL-7 Si Composites

LSM was employed to fabricate in situ TiB₂ particulates reinforced Al-7Si composites.Scanning alloy observation shows that TiB₂ particulates are well distributed within the matrix and their average magnitude is about 400 nm in diameter.TiB₂ not only acts as a grain refiner for primary α-Al,but also as a modifier of Si in eutectic mixture.The mechanical property and wear resistance of the alloy are significantly improved with the addition of TiB₂ particulates.