MODELING OF TWIST EXTRUSION OF POWDER BILLETS
The twist extrusion (TE) of porous billets is studied. The effect of processing and geometrical parameters (counterpressure, container sizes, number of passes) on the porosity distribution and the accumulated strain in solid phase is considered. It is shown that counterpressure allows the prevention of swelling and provides the uniformity of density distribution. The decrease in the number of passes leads to the growth of the mean density and the accumulated matrix strain. The given process is accompanied by the smoothing of density distribution. The container stipulates additional hydrostatic pressure within the volume of porous billet. It, nevertheless, does not change qualitative character of density distribution