Densification of Al 5083 Mechanically Alloyed Powder by Equal Channel Angular Pressing

Abstract

Equal channel angular pressing (ECAP), one of the most important methods in SPD, is used for the consolidation of mechanically alloyed Al 5083 powder. This paper mainly focuses on the densification of Al 5083 mechanically alloyed powder by ECAP with and without application of back pressure up to three passes with four different routes at room temperature. Aluminum can is used to encapsulate the powder. The particle size, crystallite size, microstructure and density were evaluated by scanning electron microscope and X-ray diffraction peak profile analysis. The crystallite size was measured by Williamson Hall analysis. Density and hardness were increased with increasing number of passes and upon sintering after ECAP. Good densification as well as good powder bonding was observed after three passes of ECAP.

Effect of Back Pressure on the Consolidation Behaviour of Titanium Sponge Particles Processed by ECAP

“…The shell is then fitted in the split ECAP die with die channel angle 90 o as shown in Fig. 1a [8][9][10][11][12][13]. Molybdenum disulphide (MoS2) is used as a lubricant to reduce the friction between Al shell and die contact surface.…”

“…Each route has a shear pattern of its own which will minimise the pores and act like grain refinement in bulk materials. Hence the spherical voids deform and become elliptical in addition to grain fragmentation [8].…”