Identification of the phase composition of recycled scrap, with particular emphasis on non-metallic compounds (oxides, nitrides, fluorides, chlorides, etc.) as well as the physicochemical and thermophysical aspects of non-metallic inclusions and impurities on the endomodification effect.

The recycling of magnesium alloys is a complicated problem due to the high reactivity and flammability of magnesium alloys even at temperatures below the melting point. From the economical point of view it is required that the process scrap has to be reused in-house. As a result of the research task a new technique of remelting of the process scrap has been invented which due to the existence of crystal nuclei causes a self-refining effect. The studies included two of the most commonly used magnesium alloys – AZ91 (MgAl9Zn1) and AM50 (MgAl5). Experimental series of melts were carried out with various additions of the process scrap using two casting technologies – gravity die casting and high pressure die casting. Non-metallic inclusions present in the process scrap were identified, with special consideration towards compounds containing carbon which is the element with the most potent refining capabilities. Based on the results of the metallographic (mean grain size) and the mechanical properties examinations as a function of the amount of the process scrap addition and statistical analysis the optimal addition of the process scrap has been determined. Technological recommendations concerning the effective reuse of the magnesium process scrap without deterioration of the castings quality have been drawn up which implementation helps increase the efficiency of the production.