Thermophysical investigations of the uranium-zirconium alloy system

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[1] Ahn, Sangjoon
[2] Irukuvarghula, Sandeep
[3] McDeavitt, Sean M.
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Ahn, S. (sjahn@kaeri.re.kr) | 1600年 / Elsevier Ltd卷 / 611期
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The solid phase transformation behavior of uranium-zirconium (U-Zr) alloys (U-0.1; 2; 5; 10; 20; 30; 40; and 50 wt% Zr) was observed using differential scanning calorimetry (DSC) with thermogravimetric analysis (TGA). The phase transformation temperatures and enthalpies were measured from the alloys annealed at 600 °C for 72; 168; and 672 h. The observations indicated distinctive mismatches between the measured data and the existing U-Zr alloy phase diagram. Most notably; the phase transformation of the (α-U; γ2) phase to the (β-U; γ2) phase at ∼662 °C was not evident in Zr-rich (> 10 wt%) U-Zr alloys; while only two phase transformations were evident in the U-10Zr and U-20Zr alloys compared to the three isotherm lines extended over the two compositions in the current phase diagram. The absence of the phase transformation is rather consistent with the older U-Zr phase diagram that was experimentally assessed in the 1950s. This observation may lead to the conclusion that the (β-U; γ2) phase region is not correctly represented in the Zr-rich portion; or the hyper-monotectoid region; of the current U-Zr alloy phase diagram. It is evident that the phase diagram needs to be experimentally revisited to provide more reliable information for the development of metallic nuclear fuel performance models; if such models are to include phase-relevant effects; such as fuel constituent redistribution and fission gas swelling. © 2014 Elsevier B.V. All rights reserved;
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