Acad Sinica, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China
; Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
; Anshan Normal Coll, Dept Phys, Anshan 114005, Peoples R China
Small angle x-ray scattering technique was used to analyze the variation of microstructure parameters of precipitates in an Al-Zn-Mg-Cu-Li alloy aged at 130, 150 and 160degreesC for the same duration. Precipitate particles' radius increased with aging temperatures, but their specific inner surface and integrated intensities decreased with aging temperatures. The study on Porod curves q(3)J(q)-q(2) indicates that there is a sharp boundary between precipitates and the matrix.