Abstract
Multi-pass friction stir alloying is performed to incorporate bio-ceramic Nano-powders with MB3 magnesium alloy. The reinforcement bio-ceramic particles were hydroxyapatite (HA), tri-calcium phosphate (TCP) and aluminum oxide (Al2O3) Nano powders. The results revealed that the increased number of FSP passes caused a refinement in the grain structure, resulting in increasing average microhardness values in the stirred zone. Furthermore, all processed samples revealed tensile and yield strength values lower than that of the base material, with an enhancement in their ductility. While, the electrochemical impedance spectroscopy (EIS) results showed a higher radius capacitive loop of the 4-pass manufactured composites, and the best corrosion behavior was achieved at the 4-pass Mg-HA composite. Moreover, the potentiodynamic polarization (PDP) results showed lower current density with higher polarization resistance values (Rb) of the manufactured composites compared to the base material which reflects the improvement in the corrosion behavior. Moreover, the immersion test results displayed also lower corrosion rates of all processed samples, where the lowest corrosion rate was achieved at 4 passes Mg-HA composite with a reduction of about 27 % of the BM after 7 days of immersion in simulated body fluid (SBF).
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