| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Hardenability and Microstructural Evolution of a Heat-Treated and Precipitation Strengthened NiTiHfAl Alloy |
| Author(s) |
Flavia da Cruz Gallo, Eitan Hershkovitz, Yang Yang, Hunter B Henderson, Michael S Kesler, Honggyu Kim, Michele V. Manuel |
| On-Site Speaker (Planned) |
Flavia da Cruz Gallo |
| Abstract Scope |
NiTi-based alloys are used in mechanical components because of their good hardenability, wear, and corrosion resistance. By optimizing alloy composition and heat treatments, the design of a new intermetallic alloy with improved properties, such as hardness, may unveil a wider range of applications. In this work, an arc melted 50Ni21Ti25Hf4Al (at.%) alloy was solution treated at 1050°C followed by aging at 600°C to investigate the effect of aging time on the microstructure and mechanical properties. Two types of nano-sized precipitates were determined using scanning and transmission electron microscopy (SEM and TEM): the face-centered orthorhombic H-phase (TiHf)Ni and the L21 Heusler precipitates Ni2TiAl. The morphology and orientation of the precipitates were investigated. A correlation between the microstructural evolution and alloy’s hardness was established to elucidate the precipitate’s coarsening kinetics and their strengthening contribution after aging up to 1000h, resulting in a tuning nanoprecipitation approach for achieving enhanced hardness. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, Characterization |