What is Nitinol? It is important to note that Nitinol was not the first shapes memory alloy discovered. Researchers has been playing around with gold cadmium since 1939, and the shape memory effect was minimal, and the material was extremely expensive. Buehler. Buehler is a metallurgist at the Naval Ordinance Labs, working on a project to develop a nose cone for the Polaris missile capable of withstanding the heat of re-entry into the Earth’s atmosphere. Buehler described this project as ‘boring’ and hoped something ‘interesting’ would pop up. Well, it did, however, not in the way that anyone would have expected. Buehler is looking at alloys with two solid states like possible materials for the nose cone. He had choose roughly 60 alloys for further examination from a book entitled Constitution of Binary Alloys–Nitinol being one of them. Instead, it returned a dull thud–like dropping a flour sack on the ground.
Phase composition of Nitinol The X-ray diffraction patterns of the prepared samples are shown in the next pictures. One can see significant differences in the phase composition of the prepared samples. While NiTi occurred as rhombohedral R-phase and orthorhombic B19 martensite in the case of the CP sample, in the FP sample, it formed B2 austenite at room temperature. It is caused by the different nickel content in the NiTi matrix (approximately 48,89 at.% for CP and 49,40 at.% for FP), which was determined by point EDX analysis. These differences lead to a shift in transformation temperatures. This claim agrees with the DSC measurement shown in the next part. Except for the NiTi phase, both prepared samples contained the Ti2Ni phase.
Transformations temperatures of Nitinol In measured DSC curves, one can see big differences in transformation behavior. While transformations occurring during heating and cooling are obvious in the case of the CP sample, no distinct peaks were found in the DSC curves of the FP sample. During the cooling of this sample, no changes were detected, which implies, that the NiTi phase occurred in the austenitic state in measured temperatures interval. It is in good agreement with the XRD-analysis results. During heating, some weak endothermic peaks and a change in the slope of the curve were detected. These observations were not well justified and will be studied in the future. In the case of the CP sample, the transformation of martensite or R-phase in austenite occurred (endothermic peak around 60°C) during heating. During cooling, the NiTi phase transformed from an austenitic structure to R-phase and subsequently to B19 martensitic structure. One can see some differences. While the compressibility of both samples is similar, the yield point of the CP sample is markedly higher. It is probably caused by a higher content of the Ti2Ni phase (in Chinese letter-like shape especially) and by the lower porosity of this sample. No plateau, typical for superelastic alloys, was found in the compression curve of the FP; it is probably due to the strong influence of the presence of the Ti2Ni phase and porosity especially.
Price of Nitinol Nitinol particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Nitinol. A large amount of large amount will be lower. The Price of Nitinol is on our company's official website.
Nitinol supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Nitinol, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Nitinol , you are welcome to contact us or inquire at any time.
