Effects of Temperature and Deformation on B19- R - B2 and B19 - B2 Transformation in Prealloyed NiTi SMA Powders
Journal Title: Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji - Year 2018, Vol 6, Issue 3
Abstract
In this study, prealloyed NiTi shape memory alloy (SMA) powders have been deformed at 25°C, 100°C, 200°C and different loading rates (800MPa, 1300MPa, 1600MPa, 1800MPa, 2000MPa, 2500MPa). In order to determine the effects of different pressing rates on NiTi SBA powder, DSC, XRD analyzes were performed. Furthermore, optical microscope images of raw powders were examined. B19 → R and R → B2 multi-stage transformation peaks were observed in the structure at 25ºC, whereas only B19 → B2 a single-stage transformation peaks were observed after pressing at 100°C and 200°C. When the XRD analysis of the samples was examined, the peak intensities of the B2 (austenite) phases in the raw powders were decreased due to the deformation rate, and the lowest B2 intensities were found at the highest deformation rate. The reason for the decrease in XRD peak intensity can be attributed to the decrease in the severity of the austenite peak and the onset the increasing of martensite peak intensities, depending on the increasing rate of deformation.
Authors and Affiliations
Sinan AKSÖZ, Gülizar ALTINIŞIK, Ekrem Emre ELVERİŞLİ, Bülent BOSTAN
Keywords
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- EP ID EP490847
- DOI 10.29109/gujsc.387674
- Views 99
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