Study Of Microstructure and Properties of Zn – 1% Mg – 0.1% Dy and Zn – 1% Mg – 0.1% Mn Alloys After High-Pressure Torsion

Abstract

The microstructure, mechanical properties and corrosion resistance of promising medical Zn – 1% Mg – 0.1% Dy and Zn – 1% Mg – 0.1% Mn alloys after high-pressure torsion (HPT) are studied. It is shown that the HPT results in formation of an ultrafine-grained structure of α-Zn with grain size 450 – 700 nm in both alloys. The grain-boundary magnesium phase is refined to a nanosize and Mn- and Dy-enriched particles are precipitated. This refinement of the structure leads to a simultaneous increase in the strength and ductility of both alloys without changing their corrosion resistance. At the same time, the corrosion rate of the alloys both before and after the HPT does not exceed 0.35 mm/year.