Effect of Hot Extrusion on Microstructure and Tensile Properties of Ca Modified Mg-Mg2Si Composite

Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): M. Lotfpour, M. Emamy, S.H. Allameh, B. Pourbahari Effect of 0.05, 0.1, 0.5, 1 and 3 (wt. %) Ca addition and extrusion process on the microstructure and tensile properties of Mg-Mg2Si metal matrix composite has been studied by the use of optical microscopy (OM) and standard tensile testing. The average size of primary Mg2Si particles decreased from 34μm to about 10μm with the addition of 0.05 (wt.%) Ca and extrusion process and also the size of eutectic Mg2Si decreased from 20μm to about 2μm. The morphology of Mg2Si particles altered from octahedron to fine polygonal and more round shape and eutectic phases altered to well distuributed fragmented particles on the microstructure that was enhance the mechanical properties in comparison with as-cast specimens. Tensile test showed that UTS value increases with the addition of Ca. The maximum UTS value was achieved with 0.1 (wt.%) Ca addition.
Source: Procedia Materials Science - Category: Materials Science Source Type: research