INVESTIGATION OF THE INFLUENCE OF THE ECAP-CONFORM PROCESS ON THE MECHANICAL PROPERTIES OF A BIORESORBABLE MAGNESIUM ALLOY OF THE MG-ZN-ZR SYSTEM

Abstract

At present, the development of innovative medical methods for restoring the lost functions of patientsis being actively carried out, in which the use of biosoluble (bioresorbable) materials is of particularimportance. These materials include alloys based on Mg, Fe, Zn, which can significantly reduce thetrauma and treatment time. But these materials have disadvantages in the form of low strength andincreased fragility, which limits their use in medical implants. Therefore, improving the mechanicalcharacteristics of bioresorbable alloys is an urgent problem. Severe plastic deformation (SPD) is oneof the modern tools for improving the properties of metallic materials by significantly reducing theinitial structure to an ultrafine-grained or nanocrystalline state. One of the effective methods of SPDis the method of equal-channel angular pressing according to the Conform scheme (ECAP-Conform).In this work, we studied the effect of technological parameters on the stress-strain state of a workpiecemade of biosoluble magnesium alloy grade MA-14 during processing by the ECAP-Conformmethod. Within the framework of the study, finite element computer modeling was carried out inthe Deform-3D package and a physical experiment was carried out on the ECAP-Conform facility.According to the results of computer simulation, it was recommended to carry out the processingof ECAP-Conform at deformation temperatures of 150 and 200 °C on a tooling with an intersectionangle of 120°. In the course of experimental work, laboratory samples were obtained, the ultimatestrength was 305 MPa, the relative elongation in tension was 25%.