Topic
Zirconium alloy
About: Zirconium alloy is a research topic. Over the lifetime, 6548 publications have been published within this topic receiving 78954 citations. The topic is also known as: zircaloy.
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TL;DR: In this paper, a process development study is conducted to recover and reuse zirconium from used nuclear fuel (UNF) ZIRconium alloy cladding using dry pyrochemical iodination, chlorination, and hydrochlorination.
36 citations
TL;DR: In this article, the effect of hydrogen concentration on the delayed hydride cracking velocity (DHCV) and threshold stress intensity factor, KIH of a Zr-2.5Nb tube were examined at test temperatures ranging from 100 to 280°C by subjecting compact tension specimens with a hydrogen concentration of 12 to 100 ppm H to an overtemperature cycle.
Abstract: The effect of hydrogen concentration on the delayed hydride cracking velocity (DHCV) and the threshold stress intensity factor, KIH of a Zr-2.5Nb tube were examined at test temperatures ranging from 100 to 280°C by subjecting compact tension specimens with a hydrogen concentration of 12 to 100 ppm H to an overtemperature cycle. The DHCV and KIH increased and decreased, respectively, with an increase in the supersaturated hydrogen concentration over the terminal solid solubility for dissolution (TSSD) or ΔC. They then leveled off to constant values at ΔC in excess of the ΔCmax corresponding to a difference of the terminal solid solubility of the hydrogen on cool-down and on heat-up. Further, intentional introduction of an undercooling by 0 to 40°C at the test temperature decreased the DHCV of the Zr-2.5Nb tube, indicating that ΔC between the bulk region and the crack tip governs the DHCV. A new DHC model is proposed where the driving force for DHC is the difference in the hydrogen concentration between the bulk region and the crack tip by preferentially nucleating the hydrides only at the crack tip under an applied tensile stress, due to a hysteresis in the TSS of hydrogen on heat-up and on cool-down. A supplementary experiment was conducted to validate the feasibility of the proposed DHC model.
36 citations
TL;DR: In this paper, the authors characterize the passive film that forms on pure zirconium in contact with an aqueous phase at elevated temperatures (in this case, 250°C), prior to storage, using electrochemical impedance spectroscopy (EIS) with the data being interpreted in terms of the point defect model (PDM).
36 citations
TL;DR: In this paper, the authors modified the steady-state model of delayed hydride cracking to take account of a temperature gradient in the material and predicted an increase in the crack velocity in a positive temperature gradient (crack-tip cooler than surroundings) and a reduction in a negative temperature gradient.
36 citations
TL;DR: In this article, a magnesium-zirconium alloy has been examined in creep at 400-450 °C and denuded zones are shown to form at grain boundaries normal to the applied stress and the size of these zones can account for the entire creep strain.
36 citations