Abstract
Abstract : Transmission electron microscopy has been used to investigate the precipitation reactions associated with Beta (A13Zr) particles in 8091 alloy sheet (<2 mm thick). The microstructures obtained at various stages of ageing have been studied. It was observed that in addition to acting as nucleation sites for the precipitation of delta (A13Li), the Beta particles also provide sites for the nucleation of dislocation loops. These loops then act as sites for the heterogeneous precipitation of S phase (A12CuMg) during ageing. An additional type of precipitate at the Beta sites has been identified as Theta (A12Cu).
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