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pp.718-719
Two different commercial aluminium powder grades have been densified by direct hot extrusion. The extrusion temperature was 425 °C, with an extrusion ratio of 1:16. Prior to extrusion, some green compacts were pre-sintered (500 °C). The evolution of the extrusion load during the process and the hardness of the final products have been investigated. Additionally, microstructural characterization by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Electron Backscattered Diffraction (EBSD) was carried out. The obtained results evidence grain refinement. Additionally, inter-metallic precipitation, dynamic recovery and geometric dynamic recrystallization take place depending on some process variables, powder composition, heat treatment, strain ...
