Influence of the microstructure of the initial material on the Zn wires prepared by direct extrusion with a huge extrusion ratio

0546341 - FZÚ 2022 RIV CH eng J - Journal Article
Čapek, Jaroslav - Kadeřávek, Lukáš - Pinc, Jan - Kopeček, Jaromír - Klimša, Ladislav
Influence of the microstructure of the initial material on the Zn wires prepared by direct extrusion with a huge extrusion ratio.
Metals. Roč. 11, č. 5 (2021), č. článku 787. E-ISSN 2075-4701
R&D Projects: GA ČR(CZ) GA18-06110S; GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : Zn-based absorbable materials * biodegradable materials * extrusion * mechanical properties * microstructure
OECD category: Materials engineering
Impact factor: 2.695, year: 2021
Method of publishing: Open access

In this study, we prepared zinc wires with a diameter of 250 µm by direct extrusion using an extrusion ratio of 576. The wires extruded at 300 ◦C possessed a coarse-grained microstructure and the shape of their tensile stress–strain curves suggested that twinning played an important role during their deformation. A significant influence of the initial grain size on the final microstructure was observed after the extrusion at 100 ◦C. The wires prepared from the billet with a very coarse-grained microstructure possessed a bimodal grain size. A significant coarsening of their microstructure was observed after the tensile test. The wires prepared from the medium-grained billets at 100 ◦C were relatively coarse-grained, but their grain size was stable during the straining, resulting in the highest ultimate tensile strength. This preliminary study shows that strong attention should be paid to the extrusion parameters and the microstructure of the initial billets.
Permanent Link: http://hdl.handle.net/11104/0322899