| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
|
| Presentation Title |
Microstructure and Mechanical Properties of High-entropy Superalloy HESA-3 at Intermediate Temperature |
| Author(s) |
Takuma Saito, Akira Ishida, Michinari Yuyama, Yuji Takata, Kyoko Kawagishi, Hideyuki Murakami |
| On-Site Speaker (Planned) |
Takuma Saito |
| Abstract Scope |
Recently, high-entropy superalloys (HESAs) have been proposed for high temperature applications. HESAs possess γ and γ’ two phase structure, identical to that of Ni-based superalloys, while their compositions are quite different. In addition, structure/property relationship of HESAs, have not been investigated. This study focuses on the effect of heat treatment on microstructural changes and resulting mechanical behavior of HESA. Single crystal bars of HESA-3 (Ni-8.9Fe-16.9Co-7.5Cr-0.9Mo-0.5W-10.3Al-5.8Ti-1.2Nb in at.%) having approximately 70 vol.% of γ’ were fabricated. Some heat treatments were conducted for the bars to control the size and shape of the γ’ precipitates, then tensile and tensile creep test were performed at 760 °C. SEM, STEM, and EBSD analyses were performed for microstructural observation. It is confirmed that shape and distribution of γ’ precipitates can be altered, i.e. regular distribution with cubic shape and irregular distribution with spherical shape. Relationship between microstructure and deformation behavior of HESA-3 will be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, High-Entropy Alloys, |