|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||H-23: The Role of Co on Suzuki Segregation in Ni- and Co-based Superalloys
||Victoria Tucker, Sae Matsunaga, Dongsheng Wen, Michael Titus
|On-Site Speaker (Planned)
The fundamental driving forces for solute segregation to planar defects in superalloys are still not well understood. This work investigates the Ni-Co and Ni-Ti γ (disordered FCC) binary systems as well as γ‘-forming Ni-Co-Al-X (X= Ta, Ti, Nb) alloys to better understand the effect of composition on solute segregation. Computational work from first principles using density functional theory investigates the relationship between magnetization and energy effects with respect to segregation for the binary systems. For the γ‘-forming alloys, three dimensional formation energy vs. composition convex hull diagrams represent the calculated compositions where segregation is thermodynamically favorable. In all cases, HRSTEM and EDS experimental characterization techniques are used to quantify solute segregation to planar defect. The effect of Co on segregation of Ta, Ti, and Nb will be elucidated, and future alloy design strategies for increasing creep strength will be discussed.
||Computational Materials Science & Engineering, Characterization, High-Temperature Materials