Direct extrusion of thin Mg wires for biomedical applications

0532120 - FZÚ 2021 RIV NL eng J - Journal Article
Tesař, Karel - Balík, Karel - Sucharda, Zbyněk - Jäger, A.
Direct extrusion of thin Mg wires for biomedical applications.
Transactions of Nonferrous Metals Society of China. Roč. 30, č. 2 (2020), s. 373-381. ISSN 1003-6326
Institutional support: RVO:68378271 ; RVO:67985891
Keywords : biomedical materials * mechanical properties * fracture * nonferrous metals * magnesium
OECD category: Materials engineering; Materials engineering (USMH-B)
Method of publishing: Limited access
https://doi.org/10.1016/S1003-6326(20)65219-0

Biodegradable wires are the novel trends in current biomaterial research. A thin 99.92% Mg wire with a diameter of 250 µm was prepared via direct extrusion with an extreme reduction ratio of 1:576. The total imposed strain in a single processing step was 6.36. Extrusion was carried out at elevated temperatures in the range from 230 to 310 °C and with various ram speeds ranging from ∼0.2 to ∼0.5 mm/s. The resulting wires show very good mechanical properties which vary with extrusion parameters. Maximum true tensile stress at room temperature reaches ∼228 MPa and ductility reaches ∼13%. The proposed single-step direct extrusion can be an effective method for the production of Mg wires in sufficient quantities for bioapplications. The fractographic analysis revealed that failure of the wires may be closely connected with inclusions (e.g., MgO particles). The results are essential for determining the optimal processing conditions of hot extrusion for thin Mg wire.
Permanent Link: http://hdl.handle.net/11104/0310722