Biodegradable implants are effective because of no revision surgery is needed for further implant removing. It was known that the Mg-Zn-Ca-(Mn) alloys are promising for biodegradable applications because of high biocompatibility and enough mechanical properties. The influence of hot extrusion at different temperatures on the microstructure and mechanical properties in longitudinal and transverse direction with respect to the deformation axis of four Mg-Zn-Ca-(Mn) alloys was studied in this research. It was established that for low hot extrusion temperatures the large non-recrystallized elongated grains surrounded by fine grains are typical. With increasing of hot extrusion temperature, the fully recrystallized fine uniform grains were observed. The grain size after extrusion change from 1.5 to 6.2 μm and the upper limit relates to hot extrusion at high temperatures. It was demonstrated that higher ultimate tensile strength, higher yield strength and lower elongation is typical for low hot extrusion temperatures and vice versa. The mechanical properties are higher in longitudinal direction and the best its combination was observed for MgZn4Ca0.5 alloy.Keywords: biodegradable magnesium alloys, Mg-Zn-Ca-Mn, Mg-Zn-Ca, hot extrusion, grain size
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