2037 KB29 KB200020242014Jablonská, EvaKubásek, JiříPospíšilová, IvaRuml, TomášVojtěch, Daliborletnik:48številka:5str. 623-629COBISSID:1082538ISSN:1580-2949URN:URN:NBN:SI:doc-1PE7JPFVenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijebiodegradable materialbiorazgradljiv materialcinkcitotoksičnostcytotoxicitymechanical propertiesmehanske lastnostistructurestrukturazincStructural, mechanical and cytotoxicity characterization of as-cast biodegradable Zn-xMg (x = 0.8-8.3 %) alloys| Strukturne, mehanske in citotoksične lastnosti biorazgradljive Zn-xMg (x = 0,8-8,3 %) zlitine v litem stanju|In the present work, the structural, tensile, compressive and bending mechanical properties as well as the cytotoxicity of the Zn-Mg biodegradable alloys containing mass fractions from 0 % up to 8.3 % Mg were studied. It was found that the maximum tensile and compressive strengths of 170 MPa and 320 MPa, respectively, were obtained for the Zn-0.8Mg alloy. This alloy also showed the highest tensile elongation of 2 %. Mechanical properties were discussed in relation to the various structural features of the alloys. The structure of the strongest Zn-0.8Mg alloy was composed of a fine mixture of a-Zn dendrites and a-Zn + Mg2Zn11 eutectics. The cytotoxicity was evaluated with an indirect contact assay using human osteosarcoma cells (U-2 OS). The cytotoxicity of the Zn-0.8Mg alloy extract was low and only slightly higher than in the case of the pure-Mg extractV tem delu so bile preučevane struktura, natezne, tlačne in upogibne mehanske lastnosti biorazgradljive zlitine Zn-Mg z masnim deležem od 0 % do 8,3 % Mg. Ugotovljeno je bilo, da sta bili pri zlitini Zn-0,8Mg doseženi največja natezna in tlačna trdnost 170 MPa oziroma 320 MPa. Ta zlitina je tudi pokazala največji raztezek 2 % pri natezni obremenitvi. Mehanske lastnosti so prikazane v odvisnosti od mikrostrukturnih značilnosti zlitin. Mikrostruktura najmočnejše zlitine Zn-0,8Mg je bila sestavljena iz a-Zn-dendritov in a-Zn + Mg2Zn11-evtektika. Citotoksičnost je bila ocenjena s posrednim preizkusom kontakta s celicami človeškega osteosarkoma (U-2 OS). Citotoksičnost ekstrakta zlitine Zn-0,8Mg je bila majhna in samo malo večja v primerjavi z ekstraktom čistega MgTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije