The main aim of this paper is to investigate the evolution of porosity as consequence of pressing, sintering and ECAPping an aluminium based powder, by means of comparison of calculated and experimental results. After applying compacting pressure, specimens were dewaxed in a ventilated furnace at 400 °C for 60 min. Sintering was carried out in a vacuum furnace at 610 °C for 30 min. The specimens were then ECAPed for 1 pass. The 2-dimensional quantitative image analysis was carried out by means of SEM and OM for the evaluation of the aforementioned characteristics. The porosity evolution during ECAP process represents by the relationship aspect versus D_(circle) was proposed. Basing on the mathematical description of porosity, it is presumably to quantify when the pore size represents a critical pore size in ECAPed PM aluminium alloys.
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