Effect of wt.% SiCp and TiB on the Mechanical Properties in SiCp/AZ81A Magnesium Matrix Composite by the Method Semi Solid Stir Casting.

Magnesium matrix composites reinforced with SiC_p particles were fabricated using the semi-solid stir casting process. The purpose of the study was to the effects concentration wt% SiC_p and TiB of the mechanical properties of composites Al-Mg-2TiB/SiC_p and Al-Mg-4TiB/SiC_p. Variations (3, 6, 9 wt.%) SiC_p/Al-Mg composites with different SiC_p and TiB contents were successfully fabricated by semi-solid stir casting. Mechanical stirring technique carried out in conditions of semi-solid to obtain SiC_p particles evenly dispersed. Effects of SiC_p and TiB content on mechanical properties were studied by density, porosity, hardness test, impact test and microstructure images. The results indicate that SiC_p particles disperse homogeneously in AZ81A matrix, and interfacial reaction between matrix and SiC_p particles is effectively controlled. Distribution of SiC_p reinforcement and interfacial bonding are improved by adding TiB. Additionally, the mechanical properties of composites are remarkably improved with the SiC_p and TiB content increasing. The addition of (2 and 4 wt%) TiB gives grain refinement on the AZ81A matrix. [ABSTRACT FROM AUTHOR]