The influence of Li on the tensile properties of extruded in situ Al-15%Mg2Si composite

► Effect of Li contents on the microstructure of homogenized and extruded Al-15%Mg2Si. The optimum concentration of Li was found to be 0.5 wt.%. ► The highest UTS and %El. values were 280 MPa and 16 for Al-15%Mg2Si-0.5%Li MMC. ► Li addition changed the fracture behavior of the composite from brittle to ductile.