| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Investigation on the NiTiCoHf Multicomponent shape memory alloys |
| Author(s) |
Jongtae Kim, Juree Jung, Jaeyeol Jeon, Leeseung Kang, Konrad Kosiba, Donghyun Bae, Junhee Han |
| On-Site Speaker (Planned) |
Jongtae Kim |
| Abstract Scope |
NiTi alloys are the most preferred materials for shape memory effect (SME) applications due to their stability and feasibility. However, their use is limited to temperatures below 100 °C because of their relatively low transformation temperatures (TTs), such as martensite finish temperature (Mf) and austenite finish temperature (Af). Several attempts to increase the TTs by incorporating highly soluble alloying elements, such as Hf, Zr, Pd, Co, Cu, and Pt have been reported.
In this study, we prepared quaternary NiTiCoHf SMAs forming a single B2 phase. The B2 crystal structure of the NiTiCoHf alloy is based on the (NiCo)(TiHf) system, as Co and Hf are highly soluble alloying elements in the Ni and Ti, respectively. We investigated the phase transformation and shape memory behaviors using X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and a universal testing machine. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, |