The sintering behaviour and microstructural evolution of two aluminium. alloys, of the 2XXX and 7XXX series, has been studied under, both, laboratory and industrial conditions. Quenching experiments from selected temperatures during the heating cycles, coupled with microstructural characterisation by Electron Microscopy, were used to investigate the gradual approach towards equilibrium of the alloys, from the as-pressed powder mixtures to the consolidated state after sintering. Differential Scanning Calorimetry was used to identify the reactions leading to the formation of liquid phases during sintering while the associated dimensional changes were determined by Dilatometry. The sinterability of these alloys and the development of necks between the solid aluminium particles is based upon the initial formation of transient liquid phases that favour the incorporation of alloying additions, followed by the development of permanent liquid phases, mainly containing Zn/Mg/Al and Cu/Al for the 7XXX and 2XXX series, respectively, leading to the densification of the alloys. A series of geometrically complex components with adequate dimensional tolerance and properties were industrially produced for an automotive application using the 2XXX series P/M Al alloy.