Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing Synchtrotron Radiat Facil Div, Beijing 100039, Peoples R China
Small angle X-ray scattering has been used to study the variation of microstructure parameters in an AlZn-Mg-Cu-Li alloy aged at various temperatures for various durations. Coarsening of precipitates was studied by analyzing the curve of kinetics strength vs the cube of radius. The results show that the coarsening of precipitates conforms to LSW principle. In addition, the characteristic of s(3)J(s) vs s curves was analyzed. The results show that the curves for samples aged at 160 degreesC for various durations(24, 48 and 96 h) have negative deviation, which maybe results in the formation of certain new precipitate. In the other aging treatment states, the curves conform to Porod principle which means there is sharp boundary between the precipitates and matrix.