|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||Leveraging Local Phase Transformation Strengthening to Achieve Superior Next Generation Superalloys
||Timothy Smith, Timothy Gabb, Nikolai Zarkevich, Mikhail Mendelev, Valery Borovikov, Christopher Kantzos, Ashton Egan, John Lawson, Michael Mills
|On-Site Speaker (Planned)
For this study, multiple new disk superalloys (TSNA 1-6) specifically designed to take advantage of strengthening atomic-scale dynamic complexions were investigated. This local phase transformation (LPT) strengthening provided newly acquired and forged superalloy TSNA-1 with almost 10x better creep strength over similar forged disk superalloys and over a 2x improvement compared to the single crystal blade alloy CMSX-4 at 760 °C. Ultra-high-resolution chemical mapping of the creep induced superlattice stacking faults confirmed this improvement was the result of atomic-scale η (D024) and χ (D019) local phase transformations as, notably, microstructural differences could not explain the observed differences in creep strength. To better understand these results, density functional theory and molecular dynamic modelling were used to explore the effect chemistry has on activating these strengthening phase transformations along stacking faults. In addition, the effect these atomic-scale mechanisms have on other important properties will be examined.
||Characterization, High-Temperature Materials, Phase Transformations