| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
|
| Presentation Title |
The Design and Characterization of High Entropy Alloys for High Temperature Applications |
| Author(s) |
Kevin Garber, Bhaskar S. Majumdar |
| On-Site Speaker (Planned) |
Kevin Garber |
| Abstract Scope |
We report our investigation of high entropy alloys (HEA) for use in the range 600 – 900C, for turbine engine applications. The objective was to evaluate whether the high configurational entropy (delta-S) of HEAs would permit high temperature strengths that were competitive with superalloys, while offering a lower density. CALPHAD based alloy design strategy relied on forming a high volume fraction of L12 precipitates in an fcc matrix, while minimizing brittle phases. Screened alloys were arc melted and suction cast into 4 mm diameter rods. High temperature compression tests of the final alloy (delta-S=1.62) revealed yield strength of 935 MPa at 750 C, which is competitive with most superalloys (delta-S≤1.3) and improved on the best high temperature HEA to date. The density was approximately 7.9 gm/cc, giving the alloy specific strength advantage over existing superalloys. TEM revealed important composition trends in the precipitate and matrix phases, and will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |