About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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Presentation Title |
Design of a High Temperature Precipitates for a Complex Concentrated Alloy Using Model Ternary Alloys |
Author(s) |
Jaimie S. Tiley, Soumya Nag, Ercan Cakmak, Fan Zhang, Y Wang, Pania Newell |
On-Site Speaker (Planned) |
Jaimie S. Tiley |
Abstract Scope |
To develop/optimize the compositions for high temperature RCCAs, the CALPHAD method was used to estimate the stability of B2 phase. Specifically, Hf, Ta, Nb, and Zr additions to the Al-Ti system were modeled to investigate their impact on B2 stability at high temperatures. Phase evolution was characterization of homogenized samples were conducted using X-ray diffraction at temperatures up to 1200C (in controlled atmosphere). The resulting analysis was coupled with electron microscopy to validate CALPHAD predictions and provide insight into chemical segregation and phase evolution. Results indicate that the addition of Hf greatly reduced the formation of B2 structures, while the addition of Ta increased B2 stability to higher temperatures. Addition of Zr and Nb decreased the Bcc/B2 transition temperature, yet the resultant B2 was still stable at temperatures high enough for practical applications. The resulting microstructures were strength tested using a micro-indentation technique to determine properties up to 800C. |
Proceedings Inclusion? |
Planned: |