Abstract
Effects of Ce addition on microstructure and mechanical properties of cast and extruded ZM21 magnesium alloy were investigated using OM, XRD, SEM and uniaxial tensile testing. It was shown that with the increase in Ce content, the Mg–Ce and Ce–Zn particles which gather in dendritic gap increase gradually and finally form a network structure, which becomes thicker due to serious segregation. These grain boundary particles were broken during extrusion and dispersed in the matrix, which will inhibit the grain growth and leading to the refined structure. The tensile testing results indicated that the addition of 0·57 wt-%Ce was superior. The ultimate strength, yield strength and elongation of the alloy with as cast state were 200 MPa, 76 MPa and 24·0% respectively. In the as extruded state, the ultimate strength, yield strength and elongation were 276 MPa, 199 MPa and 24·0% respectively.
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