Structure and Mechanical Properties of Multi-Functional Layer Deposited on Surface of Ni–Ti Shape Memory Alloy

Tomasz Goryczka; Maciej Zubko; Józef Lelątko; Piotr Salwa; Tadeusz Wierzchoń; Joanna Wojewoda-Budka; Marta Janusz-Skuza

doi:10.2320/matertrans.MC201805

Tomasz Goryczka, Maciej Zubko, Józef Lelątko, Piotr Salwa, Tadeusz Wierzchoń, Joanna Wojewoda-Budka, Marta Janusz-Skuza

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Keywords: NiTi, shape memory alloy, glow discharge deposition, titanium nitride, titanium oxide, multi-layer cover

JOURNAL FREE ACCESS FULL-TEXT HTML

2019 Volume 60 Issue 5 Pages 693-697

DOI https://doi.org/10.2320/matertrans.MC201805

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Abstract

A thin layer, about 25 nm thick, was produced in glow discharge deposition process on the surface of the NiTi shape memory alloy. Structural and chemical studies revealed that the layer consisted of two sublayers. About 7 nm thick one, adhering closely to the NiTi substrate and formed from the nanocrystalline titanium nitride was followed by 17 nm of the amorphous titanium oxide layer. The technological parameters of the glow discharge process caused that the presence of the R-phase in the matrix was identified.

Fig. 3 TEM images observed for the cross-section of the layer: (a) bright field image of the layer with magnification of the sub-layers region, dark field image taken in 220_TiN with diffraction patterns of platinum and titanium nitride (b). Fullsize Image

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