Abstract
This chapter discusses the nanostructure control for high-strength and high-ductility aluminum alloys. High-performance aluminum alloys with high strength and high ductility have become markedly attractive for applications to light-weight automobiles, aircrafts, and various components. To achieve such properties for aluminum alloys, the nanostructure control of precipitates and grain boundary morphologies is essential. The initial phase decomposition and nano-composite structures have been realized to be effective in producing high-performance aluminum alloys. Recently, it has been clarified that nanoclusters are formed in the initial stage of phase decomposition and it plays very important roles in producing nanoprecipitates. Microalloying elements are also expected to modify the nanostructures of aluminum alloys. Nanoclusters act as useful nucleation sites for precipitates in grains and near grain boundaries. Several techniques have been applied to characterize nanostructures, including precise electrical resistivity measurements, calorimetry, and high-resolution transmission electron microscopy (HRTEM).
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