|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Atomic Scale Modeling and Experimental Observations of Deformation Mechanisms in Ni Base Superalloys
||You Rao, T. M. Smith, M. J. Mills, Maryam Ghazisaeidi
|On-Site Speaker (Planned)
Ni-based superalloys are promising materials for applications at elevated temperatures due to their high strength, stability and resistance to oxidation. Understanding the deformation mechanisms of these alloys is essential for improved performance. Here, we use first principles calculations to study the mechanisms for formation of planar faults and microtwin in γ'-Ni3Al. First, we calculate the segregation tendency of common alloying elements to various stable faults and find no significant driving force for segregation, in contrast with experimental observations. This apparent discrepancy indicates that these faults do not form directly in the γ'-Ni3Al. Instead, their formation involves precursors that are attractive to solutes. These precursors then undergo a reordering process to form the stable faults. Effect of alloying elements on this reordering process is also studied. This process emphasizes the importance of coupling experiments and theory to characterize and explain deformation mechanisms.
||Planned: Supplemental Proceedings volume