| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
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| Presentation Title |
Determining the Phase Boundary between α and α+α’ at Low-temperatures with Proton Irradiations and APT |
| Author(s) |
Yajie Zhao, Pengcheng Zhu, Jonathan Poplawsky, Arunodaya Bhattacharya, Jean Henry, Steven J. Zinkle |
| On-Site Speaker (Planned) |
Yajie Zhao |
| Abstract Scope |
FeCr binary alloys are useful model alloy representations of ferritic-martensitic steels, which are important structural materials for various applications. The phase separation to form Cr-rich alpha prime precipitates (á’) can induce severe hardening and embrittlement. However, accurate experimental á/á+á’ phase boundary assessments at low-intermediate temperatures are not available due to slow diffusivity of Cr atoms at temperatures below 450 °C that inhibits achievement of thermal equilibrium by annealing alone, and contradictory predictions exist from computational modeling. In order to accelerate the kinetics, proton irradiations were conducted at 250-450 °C up to 2 dpa. Thermal aging at 450-500 °C was also performed to expand the investigated temperature region. The temperature-dependent precipitate formation and matrix solute concentration after irradiations and thermal treatments were measured through atom probe tomography. á’ precipitates were observed in various specimens containing 6-18% Cr. The possible correlation of Cr-enriched clusters and dislocations was revealed by STEM-EDX technique. |
| Proceedings Inclusion? |
Planned: |