Chahbari, Ayoub (2023) What makes an alloy shape-memory. Integration Project, Industrial Engineering and Management.
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Abstract
Shape memory alloys (SMA) play a crucial role in industrial applications, such as in hybrid systems where SMAs are used due to their ability to act simultaneously as sensors and actuators. Martensitic transformation (MT) is the microstructural process that is necessary to obtain SMAs, however, in the literature it is not understood why some alloys are SMA, while others are not despite showing MT. For example, Ni-Ti and Ge-Te show similar martensitic transformations from cubic to R-phase. Despite this fact, Ni-Ti is a SMA, while Ge-Te is not. Therefore, the aim of this research is to explain the differences between these two alloys by thoroughly analysing the microstructure, which will contribute to the further understanding of SMAs. Using crystallographic theories, it is shown that both alloys form compound twinning systems {1 0 0} and {1 1 0}. Yet, a significant distinction is found in the prediction of the twinning shear in spite of the small discrepancy between the lattice angles. Due to this difference in shear, the crystal structures of both alloys have been further investigated. The results show that the crystal structures of both alloys, despite being similar, have contrasting atomic arrangements inside the crystal cell. This finding, which is often overlooked in the literature, suggests that the macroscopic property of SMAs are heavily dependent on mechanisms that develop from the atomic scale.
| Item Type: | Thesis (Integration Project) |
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| Supervisor name: | Maresca, F. and Jonker, G.H. |
| Degree programme: | Industrial Engineering and Management |
| Thesis type: | Integration Project |
| Language: | English |
| Date Deposited: | 28 Jun 2023 08:58 |
| Last Modified: | 28 Jun 2023 08:58 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/30143 |
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