An Al-Si (18-21 wt.% Si) matrix composite reinforced with 73 vol.% SiC particles was fabricated by squeeze casting technology. The thermal expansion behavior was studied from 20 to 400degreesC. The coefficients of thermal expansion of SiCp/Al composite and unreinforced matrix exhibited maxima at 250 and 350 degreesC, respectively, then diminished at elevated temperatures. This was attributed to the increment of solid solubility of silicon in aluminum. The composite was also subjected to a thermal cycling test between 20 and 150 degreesC to evaluate its dimensional stability. A residual length change was observed at the end of cycling test. It was demonstrated that the thermal stresses played an important role in its dimensional change. (C) 2003 Elsevier B.V. All rights reserved.