Phase formation and mechanical properties of Al-Mg-Mn-Ti-B-Zr-Sc composite material

Abstract

In this work composite alloys Al-2Mn-1.5Ti-2B-0.25Zr-0.1Sc, Al-4Mg-lMn-l.5Ti-2B-0.3Sc and AI-4Mg-lMn-2B-0.3Sc were obtained using casting technology. Thermodynamic calculations showed that the most probable chemical reaction during composite alloys casting is the formation of titanium aluminide. Formation of titanium and zirconium borides is also possible, but undesirable. Analysis of the structure and mechanical properties of composite alloys confirmed the interaction between boron, zirconium and scandium. Metallographic researches showed that the particles AlB2 transfer into composite alloys and look like compact agglomerations of inclusions. Also takes place the formation of acicular phases of scandium and zirconium borides, and possibly more complex phases. Copyright © 2014 by The Minerals, Metals & Materials Society.