Assessment of refinement effect of Ca and Zr alloy elements on the macrostructural evolution of Mg-3%Zn biomedical alloy in as-extruded condition

In current study calcium and zirconium alloy elements were selected to develop an Mg-3%Zn alloy for miomedical application due to the good biocompatibility of there elements. The effect of different contents of these alloy elements on the macrostructural evolution and mechanical properties of base Mg-3%Zn biomedical alloy was investigated. Micrographs of alloys were observed by optical (OM) and electronic microscopy (SEM). Vickers hardness test and tensile tesing were performed for as-extruded samples. The mechanism by which the mechanical properties are affected by calcium and zirconium addition was discussed. The obtained results illustrate that by adding different concentration of Ca new intermetallic phases formed. Indeed, the preseence of fine particles in the matrix of Mg-Zn-Ca alloy (mainly Mg6Ca2Zn3 and Mg2Ca) results in improvement of hardness. And also the addition of Ca obviously improved the mechanical lrolertes. it worth mentioning new intermetallic was detected through the microstrural studies at higher Zr levels.

Assessment of refinement effect of Ca and Zr alloy elements on the macrostructural evolution of Mg-3%Zn biomedical alloy in as-extruded condition Keywords:

Mg-3Zn alloy , Vickers , intermetallics , mechanical properties