Effects of samarium addition on as-cast microstructure, grain refinement and mechanical properties of Mg-6Zn-0.4Zr magnesium alloy

Optical images of longitudinal sections of as-cast Mg-6Zn-xSm-0.4Zr alloys (a) x=0; (b) x=2.0; (c) x=4.0; (d) x=6.0