| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
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| Symposium
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Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
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| Presentation Title |
Quantifying Creep Deformation Behavior of Optimized Local Phase Transformation Strengthened Next Generation Superalloys |
| Author(s) |
Ashton J. Egan, Longsheng Feng, Timothy Smith, Yunzhi Wang, Michael J Mills |
| On-Site Speaker (Planned) |
Ashton J. Egan |
| Abstract Scope |
Planar defects and microtwins become dominant shearing mechanisms during high temperature deformation of superalloys owing to diffusion mediated segregation/reordering. Local Phase Transformation (LPT) is employed to strengthen alloys via formation of η/χ at defects, preventing subsequent deformation. Two remarkable alloys, single-crystal NA1 and polycrystalline TaTi1, are exemplary. A NA1 polycrystalline variant had been shown to compare well with behavior of CMSX-4; this work seeks to determine activation energy and stress exponents used to describe/model this behavior using a matrix of SX NA1 subjected to various stresses/temperatures in {001}. Alloy TaTi1 was created utilizing computation-aided design to optimize LPT strengthening beyond NA1 while remaining practical for service; their creep behavior and LPT characteristics are quantified and juxtaposed. Advanced characterization of deformation structures was conducted utilizing controlled Electron Channeling Contrast Imaging (cECCI) and probe-corrected Scanning Transmission Electron Microscopy (STEM), with atomic resolution Energy Dispersive X-Ray Spectroscopy (EDS) quantifying local segregation/ordering. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Temperature Materials, Phase Transformations |