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Zinc alloys have emerged as promising candidates for biodegradable materialsdue to their remarkable biocompatibility and favorable mechanicalcharacteristics. The incorporation of alloying elements plays an essential rolein advancing the tensile strength of Zn alloys. Nevertheless, achieving uniformdispersion of these elements poses challenges due to chemical segregationduring solidification. In this study, rapid solidification followed byhigh-pressure torsion was successfully employed to fabricate Zn-Li-Mn-Mg-Cualloys characterized by ultrafine-grained microstructures with evenlydistributed nanometric intermetallic phases. A comprehensive examination,including phase composition, microstructural evolution, tensile properties anddeformation mechanisms, was conducted. The impact of varying annealingtemperatures on microstructural stability was systematically examined. Thecombined implementation of rapid solidification and high-pressure torsionyielded alloys with an average grain size below 360 nm, thereby demonstratingexceptional mechanical properties including yield stress (YS), ultimate tensilestrength (UTS), and elongation to failure (Ef) equal to at least 325+-6 MPa,350+-8 MPa and 40+-11 %, respectively. Heat treatment notably augmented themechanical properties, resulting in a YS = 440+-11 MPa and UTS = 491+-6 MPa,while preserving plasticity (Ef = 23+-4 %) in the Zn-0.33Li-0.27Mn-0.14Mg-0.1Cualloy. Nanoindentation strain rate jump tests identified thermally activatedmechanisms and grain boundary sliding as dominant deformation mechanisms.

materials science and engineering. a, structural materials: proporties, microstructures and processing/materials science and engineering. a, structural materials: properties, microstructure and processing

Enhanced mechanical properties and microstructural stability of  ultrafine-grained biodegradable Zn-Li-Mn-Mg-Cu alloys produced by rapid  solidification and high-pressure torsion