1. In vitro corrosion-fatigue behaviour of rare-earth containing magnesium WE43 in sterile complex cell culture mediumJulia Nachtsheim, Songyun Ma, Jaka Burja, Alexander Köppl, Jan-Marten Seitz, Bernd Markert, 2024, izvirni znanstveni članek Povzetek: Rare-earth containing magnesium alloys are promising biomedical materials for a new generation of biodegradable orthopaedic implant systems due to their excellent biocompatibility, mechanical and biodegradation properties. However, chemo-mechanical interactions in aggressive physiological corrosion environments result in rapid degradation and early loss of mechanical integrity, limiting its broader application for orthopaedic implants. To date, only few studies have assessed the corrosion-fatigue behaviour of medical-grade magnesium alloys in an organic physiological corrosion environment, especially under sterile test conditions. In the present work, the corrosion-fatigue behaviour of fine-grained medical-grade magnesium alloy WE43MEO was systematically analysed under in vitro conditions using an organic physiological fluid DMEM. The experimental results showed that the fatigue strength of the alloy is nearly unaffected by a 1-day precorrosion, while a 7-day precorrosion resulted in a significant deterioration of mechanical integrity. In corrosion-fatigue experiments, the fatigue life was considerably reduced by interactions between corrosion and fatigue damages. The SEM analysis revealed that the mixed mode of intergranular and transgranular fracture in the crack propagation zone transits to intergranular cracking dominant mode under the corrosion-fatigue conditions due to hydrogen embrittlement. Ključne besede: corrosion-fatigue behaviour, stress corrosion mechanisms, biodegradable magnesium alloys, WE43, DMEM Objavljeno v DiRROS: 02.08.2024; Ogledov: 131; Prenosov: 90 Celotno besedilo (11,47 MB) Gradivo ima več datotek! Več... |
2. Microstructure and properties of an AZ61 alloy after extrusion with a forward-backward oscillating die without preheating of the initial billetAnna Dobkowska, Aleksandra Zielińska, Irena Paulin, Črtomir Donik, Maciej Łojkowski, Milena Koralnik, Bogusława Adamczyk-Cieślak, Krystian Paradowski, Marek Tkocz, Dariusz Kuc, Jiří Kubásek, Matjaž Godec, Wojciech Święszkowski, 2023, izvirni znanstveni članek Ključne besede: magnesium alloys, severe plastic deformation, microstructure, mechanical properties, corrosion, extrusion, high deformation ratio Objavljeno v DiRROS: 17.05.2024; Ogledov: 248; Prenosov: 168 Povezava na datoteko |
3. In vitro and in vivo degradation behavior of Mg-0.45Zn-0.45Ca (ZX00) screws for orthopedic applicationsDiana C. Martinez, Anna Dobkowska, Romy Marek, Hanna Ćwieka, Jakub Jaroszewicz, T. Plociński, Črtomir Donik, Heike Helmholz, Bérengère Luthringer-Feyerabend, Berit Zeller-Plumhoff, Regine Willumeit-Römer, Wojciech Święszkowski, 2023, izvirni znanstveni članek Ključne besede: magnesium alloys, biodegradable implants, microstructure, electron microscopy, corrosion layers Objavljeno v DiRROS: 08.03.2024; Ogledov: 243; Prenosov: 219 Celotno besedilo (23,65 MB) Gradivo ima več datotek! Več... |
4. In vitro evaluation of stress corrosion cracking susceptibility of PEO-coated rare-earth magnesium alloy WE43Julia Nachtsheim, Songyun Ma, Jaka Burja, Bernd Markert, 2024, izvirni znanstveni članek Ključne besede: stress corrosion cracking, PEO coating, biodegradable magnesium alloys, SCC test setup, in vitro experiments Objavljeno v DiRROS: 07.02.2024; Ogledov: 343; Prenosov: 184 Celotno besedilo (16,00 MB) Gradivo ima več datotek! Več... |