OPTIMIZATION OF THE COLD ISOSTATIC PRESSING PROCESS OF MAGNESIUM POWDERS AND ITS ALLOYS

Abstract

The regularities of the formation processes of magnesium powder alloys using the cold isostatic pressing (CIP) method followed by sintering have been investigated. The study was conducted at various pressing pressures (100–400 MPa) using CIP and uniaxial pressing methods for comparison. The results indicate that CIP provides higher uniformity of compaction due to isotropic compression, in contrast to uniaxial pressing, which suffers from anisotropy and uneven compaction. The mechanisms of mechanical and chemical contact formation between particles in magnesium-based alloys, particularly Mg-20wt.%WE43-10wt.%ZK61, were identified. It was shown that the activation of magnesium slip systems under isotropic compression leads to material flow and densification. It was established that during CIP, diffusion processes of mass transfer are accelerated due to an increase in the contact area between particles, contributing to the formation of a denser microstructure after sintering.