About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Irradiation Testing: Facilities, Capabilities, and Experimental Designs
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Presentation Title |
Atom Probe Tomography Examinations of Bulk Zircaloy Irradiated at Nominally 410°C |
Author(s) |
Brian V. Cockeram, Bruce F Kammenzind, Phil Edmondson |
On-Site Speaker (Planned) |
Brian V. Cockeram |
Abstract Scope |
Atom Probe Tomography (APT) examinations were performed on bulk regions of Zircaloy-2 and Zircaloy-4 following irradiation to neutron fluences of 2.9-3.1x1025 n/m2 (E>1 MeV) at the Advanced Test Reactor (ATR). Irradiation exposure at higher temperatures of nominally 410°C resulted in about 10-80% less hardening than observed in the literature results for irradiations at 260-326°C. Clustering of Fe, Sn, and Cr solute into spherical shaped clusters at features consistent with the size and shape of <a> loops and line dislocations was observed. The formation of clusters at the dislocation loops produces the high barrier strength that is needed for a hardening model to more closely correlate with the measured irradiation, and the individual clusters not located at loops are an additional hardening barrier. Local variation in the type and distribution of clusters is observed that is correlated with differences in starting microstructure, precipitates, and local microchemistry. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Characterization, Mechanical Properties |