| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Phase Transformation Temperatures Evolution Under Plastic and Viscoplastic Deformation in High Temperature Shape Memory Alloys |
| Author(s) |
Adrien R. Cassagne, Dimitris C Lagoudas, Jean-Briac Le Graverend |
| On-Site Speaker (Planned) |
Adrien R. Cassagne |
| Abstract Scope |
Ti-rich NiTiHf are high temperature shape memory alloys (HTSMA) that can exhibit high transformation temperatures (TT) for both forward and reverse martensite-austenite transformations. However, as reported by several studies, those TT are likely to be affected by various thermo mechanical processes. As the purpose of HTSMA is to be used in severe environments (high temperature and/or stress), the aim of the present study is to evaluate the influence of plastic/viscoplastic deformation on the TT for forward and reverse transformations. Plastic strain is investigated by compressing various samples at room temperature while viscoplastic deformation is studied through pure creep experiments. Differential Scanning Calorimetry (DSC) is used to determine transformation temperatures by evaluation of heat flow variations during a thermal cycle (going from room temperature to 500°C). A thermodynamical model was used to compare the experimental results with theoretical expectations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Phase Transformations, Environmental Effects |