Comprehensive Evaluation of the Properties of Ultrafine to Nanocrystalline Grade 2 TitaniumWires

0501122 - ÚJF 2019 RIV CH eng J - Článek v odborném periodiku
Palán, J. - Procházka, R. - Dzugan, J. - Nacházel, J. - Duchek, M. - Németh, Gergely - Máthis, K. - Minárik, P. - Fekete-Horváth, Klaudia
Comprehensive Evaluation of the Properties of Ultrafine to Nanocrystalline Grade 2 TitaniumWires.
Materials. Roč. 11, č. 12 (2018), č. článku 2522. E-ISSN 1996-1944
Grant CEP: GA ČR GB14-36566G; GA MŠMT EF16_013/0001794
Institucionální podpora: RVO:61389005
Klíčová slova: titanium * ECAP * Conform * continuous extrusion * wire * medical implants
Obor OECD: Nano-materials (production and properties)
Impakt faktor: 2.972, rok: 2018

This paper describes the mechanical properties and microstructure of commercially pure titanium (Grade 2) processed with Conform severe plastic deformation (SPD) and rotary swaging techniques. This technology enables ultrafine-grained to nanocrystalline wires to be produced in a continuous process. A comprehensive description is given of those properties which should enable straightforward implementation of the material in medical applications. Conform SPD processing has led to a dramatic refinement of the initial microstructure, producing equiaxed grains already in the first pass. The mean grain size in the transverse direction was 320 nm. Further passes did not lead to any additional appreciable grain refinement. The subsequent rotary swaging caused fine grains to become elongated. A single Conform SPD pass and subsequent rotary swaging resulted in an ultimate strength of 1060 MPa and elongation of 12%. The achieved fatigue limit was 396 MPa. This paper describes the production possibilities of ultrafine to nanocrystalline wires made of pure titanium and points out the possibility of serial production, particularly in medical implants.
Trvalý link: http://hdl.handle.net/11104/0293124