Microstructure of NiTi orthodontic wires observations using transmission electron microscopy

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Ferčec, J. ; Jenko, D. ; Buchmeister, B. ; Rojko, F. ; Budič, B. ; Kosec, B. ; Rudolf, R. (2014)
  • Publisher: Croatian Metallurgical Society (CMS)
  • Journal: Metalurgija, volume 53, issue 4 (issn: 0543-5846, eissn: 1334-2576)
  • Subject: mikrostruktura materiala | nickel-titanium orthodontic wire | orotodontske žice | microstructure | SMA wires | NiTi wire | NiTi žice | spominske zlitine | TN1-997 | shape memory alloys | NiTi orthodontic wire; microstructure; TEM; EDS; average grain size | transmisijska elektronska mikroskopija | 620.187:669.245 [udc] | EDS | Mining engineering. Metallurgy | transmission electron microscopy | preiskava materiala | TEM | NiTi orthodontic wire | orthodontic wires | average grain size

This work presents the results of the microstructure observation of six different types of NiTi orthodontic wires by using Transmission Electron Microscopy (TEM). Within these analyses the chemical compositions of each wire were observed in different places by applying the EDS detector. Namely, the chemical composition in the orthodontic wires is very important because it shows the dependence between the phase temperatures and mechanical properties. Microstructure observations showed that orthodontic wires consist of nano-sized grains containing precipitates of Ti<sub>2</sub>Ni and/or TiC. The first precipitated Ti<sub>2</sub>Ni are rich in Ti, while the precipitated TiC is rich in C. Further investigation showed that there was a difference in average grain size in the NiTi matrix. The sizes of grains in orthodontic wires are in the range from approximately 50 to 160 nm and the sizes of precipitate are in the range from 0,3 μm to 5 μm.
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