High Performance Fine-Grained Biodegradable Mg-Zn-Ca Alloys Processed by Severe Plastic Deformation

Abstract

The tensile strength, fatigue, and corrosion fatigue performance of the magnesium alloy ZX40 benefit strongly from hybrid deformation processing involving warm equal-channel angular pressing (ECAP) at the first step and room temperature rotary swaging at the second. The general corrosion resistance improved as well, though to a lesser extent. The observed strengthening is associated with a combined effect of substantial microstructure refinement down to the nanoscale, reducing deformation twinning activity, dislocation accumulation, and texture transformation. The ultimate tensile strength and the endurance limit in the ultrafine-grained material reached or exceeded 380 and 120 MPa, respectively, which are remarkable values for this nominally low strength alloy.

Investigation of the cytotoxic effects of magnesium alloys on cell cultures

“…Подробно режимы обработки и получающиеся микроструктуры будут описаны в специально посвященной публикации. Краткую информацию об использованных технологиях можно найти в указанных статьях [14][15][16][17].…”

The Functional Properties of Mg–Zn–X Biodegradable Magnesium Alloys

“…Besides the chemical composition, the biomedical properties profile of Mg alloys can be manipulated by tailoring the microstructure by various thermomechanical treatments, of which severe plastic deformation (SPD) is one of the recently emerged tools [29]. What can be stated safely at this stage is that enhancement of mechanical performance (particularly, the ductility and fatigue properties [30,31]) can be achieved with Mg alloys by SPD processes without a loss in their resistance to biocorrosion [32][33][34][35]. Among the procedures devised for deformation processing of wrought Mg alloys, conventional rolling and direct extrusion are the most popular, though they tend to produce the alloys with a strong texture and, therefore, a strongly asymmetrical mechanical response.…”

“…Different techniques render different results for different needs and should be used accordingly. For example, the alloys with the LPSO structure benefit strongly from the fibre-like composite structure produced by direct extrusion, whereas many alloys like ZK60, AZ31, Mg-Zn-Ca, etc., exhibit outstanding properties profiles after a combination of various deformation processes such as equal channel angular pressing (ECAP) and extrusion [40,41], or ECAP/extrusion and swaging [31,42], multiaxial forging and rolling [43], etc., [44]. In addition to tremendous hardening, the microstructure refinement often exerts a beneficial effect on the corrosion resistance of many structural materials [45], including Mg alloys [46][47][48].…”

Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy

“…In general, in wrought Mg alloys, beside a hexagonal close packed (hcp) lattice, deformation texture and the formation of precipitates contributes to the tension-compression yield asymmetry with higher strength values in tension than that in compression [4]. The grain refinement and/or texture weakening achieved by, for example, severe plastic deformation techniques or the twin-roll casting process also can lead to a lower yield asymmetry in Mg-Zn-Ca alloys [5][6][7][8].…”