Influence of technological synthesis conditions on corrosion behaviour and mechanical properties for NiTi alloys
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 31 July 2023
Issue publication date: 20 November 2023
Abstract
Purpose
This study aims to investigate NiTi alloys’ characterization and corrosion behaviour produced by two different powder metallurgy (PM) methods.
Design/methodology/approach
It was pre-formed under a protective atmosphere at 900 °C under a force of 45 MPa and sintered for 1 h under 10–6 Mbar in an atmosphere-controlled heat treatment furnace at 1,100 °C. The relationship between microstructural properties, SEM, XRD, density, microhardness and corrosion behaviour of pre-alloyed NiTi alloys produced by two different methods with the production method was investigated.
Findings
As a result of the studies, TiO, NiTi, NiTi2 and Ni3Ti intermetallics were determined in XRD examinations. The best surface roughness was observed in the mechanically milled (MM’ed) pre-alloyed NiTi alloy compared to the pre-alloyed NiTi alloy mixed with turbula. The corrosion tests performed in 3.5% NaCl solution determined that the MM’ed pre-alloyed NiTi alloy had better corrosion resistance than the pre-alloyed NiTi alloy mixed with turbula. Pitting corrosion was visualized in the SEM images taken from the corrosion surfaces.
Originality/value
Two different PM methods produced pre-alloyed NiTi powders, and the effects of these methods on the mechanical and corrosion resistance of NiTi alloys were systematically investigated for the first time.
Keywords
Acknowledgements
The author gratefully wishes to acknowledge the financial support of the Karabuk University Science Research Department (KBÜBAP-23-DR-053). Badegül Tunçay is a PhD scholarship holder from the Council of Higher Education (YÖK) in the field of smart and innovative materials, which is one of the 100 national priority areas determined by YÖK within the scope of the 100/2000 Programme.
Citation
Tunçay, B., Çuğ, H., Tunçay, T., Özyürek, D. and Cesarz-Andraczke, K. (2023), "Influence of technological synthesis conditions on corrosion behaviour and mechanical properties for NiTi alloys", Anti-Corrosion Methods and Materials, Vol. 70 No. 6, pp. 305-313. https://doi.org/10.1108/ACMM-05-2023-2814
Publisher
:Emerald Publishing Limited
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