Effect of rotary forging on the tissue evolution, mechanical properties, degradation properties, and cytocompatibility of medical degradable Zn-0.45Mn alloys

Abstract

Zn-0.45Mn alloy in an extruded state was treated by multiple passes of rotary forging. The process generated 1 mm ultrafine grain Zn-0.45Mn material with elongation as high as 154.2 %. The rotary-forging process induced the onset of dynamic recrystallization accompanied by dislocation annihilation, forming ultrafine grain material with an average grain size of 0.89 μm. Immersion experiments revealed that denser corrosion products resulted in a lower rate of Zn-0.45Mn alloy during long-term immersion, and the corrosion rate was maintained at 40 μm/year for 30 d. Cytotoxicity and fluorescence staining experiments showed that the Zn-0.45Mn alloy exhibited good biocompatibility. Results indicated that rotary forging caused the Zn-0.45Mn alloy to be more plastic, providing greater possibilities for subsequent practical applications.