Abstract
From the point of view of possible medical applications, biodegradable alloys belong to hot-topic materials. Many different systems are studied in this field, seeking a compromise between mechanical-physical properties vs biocompatibility. Due to a suitable degradation rate, magnesium alloys, including zinc and iron, have been extensively investigated in recent years. The Mg₆₆Zn₃₀Ca₄ system is well known for its good mechanical properties and biocompatibility. In this work, we want to present a way how to improve the mechanical properties of this alloy by yttrium substitution. The Mg_66-xZn₃₀Ca₄Y_x (x = 0, 2, 4, 6) ingots were prepared by a rapid solidification process. The mechanical properties of modified alloys were compared with those of the starting alloy. Adding Y (up to 4 at.%) leads to an improvement of ultimate compressive strength. By Tafel plots, the prediction of corrosion rates of analyzed samples was estimated. A higher amount of Y (above 4 at.%) reduces corrosion.

Key words
biodegradable alloys, magnesium-based alloys, yttrium microalloying, compressive strength, corrosion resistance

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