The thermodynamic analysis of the formation of in-situ reinforced phases in(TiB 2 +Al 3 Ti)/Al- 4.5Cu composites prepared by mixed salts reaction was conducted,and heat changes of mixed salts system were analyzed by differential thermal analysis(DTA).The results show that although TiB 2 possesses the strongest formation ability in Al-Ti-B ternary system,[Ti]is relatively excessive in the in-situ reaction and it combines with Al to form Al 3 Ti phase.The reinforced phases are TiB 2 and Al 3 Ti in the produced composites due to the reaction taking place to form reinforced phase with the addition of mixed salts into Al-4.5Cu melt between 900 ℃and 1 032℃.
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