Effect of High-Pressure Torsion on Microstructure, Mechanical and Operational Properties of Zn-1%Mg-0.1%Ca Alloy

A study of the effect high-pressure torsion (HPT) on structure, phase composition, corrosion resistance, mechanical properties and bioactivity in vitro Zn-1%Mg-0.1%Ca alloy was performed. It shown that HPT leads to refinement microstructure with formation recrystallized ?-Zn grains an average size 750 ± 30 nm, a mixture different phases 38 7 nm. In addition, precipitation Ca-enriched particles ~20 nm observed. X-ray analysis showed consists five (Zn, Mg2Zn11, MgZn2, CaZn11 CaZn13), whose volume fraction does not change after HPT. found lead deterioration resistance alloy. At same time, increase yield stress from 135 13 356 15 MPa, ultimate tensile strength 154 5 416 31 ductility 0.4 0.1 5.5 2.8%. No significant hemolytic activity, bactericidal ability colonize surface by cells revealed during conducted studies. Additionally, there no difference these parameters comparison control. However, contributes decrease cytotoxicity 10% compared annealed The studies allow us conclude is promising material for development biodegradable orthopedic medical implants.