The effect of pressure on hydrogen solubility in Zircaloy-4
The effect of pressure on hydrogen solubility in Zircaloy-4
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DOI：
10.1016/j.jnucmat.2019.07.012
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发表时间：
2018-06
影响因子：
3.1
通讯作者：
H. Weekes;D. Dye;J. Proctor;D. Smith;C. Simionescu;T. Prior;M. Wenman
中科院分区：
文献类型：
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作者：
H. Weekes;D. Dye;J. Proctor;D. Smith;C. Simionescu;T. Prior;M. Wenman
在金刚石对顶砧装置上，采用同步辐射X射线衍射方法研究了压力对氢在Zr-4合金中室温溶解度的影响。研究了样品中氢水平/状态和压力传递介质的不同组合;在所有三个实验中，可以得出结论，压力导致δ Zr溶解，间隙氢似乎阻碍了ω Zr的形成。大约9 GPa的压力需要将氢化物部分减半。这些结果意味着压力的影响在热力学上类似于温度升高的影响，但影响很小。结果与α、δ和ω相的每个Zr原子的体积、α和δ相的体积模量以及α和δ相中氢位摩尔体积的先前测量结果一致。结果被解释为我们理解的驱动力在裂纹尖端，这是在一个区域的静水拉伸应力的顺序为1.5 GPa的氢化物沉淀的影响。
The effect of pressure on the room temperature solubility of hydrogen in Zircaloy-4 was examined using synchrotron X-ray diffraction on small ground flake samples in a diamond anvil cell at pressures up to 20.9 GPa. Different combinations of hydrogen level/state in the sample and of pressure transmitting medium were examined; in all three experiments, it could be concluded that pressure resulted in the dissolution of δ hydrides and that interstitial hydrogen seemingly retards the formation of ω Zr. A pressure of around 9 GPa was required to halve the hydride fraction. These results imply that the effect of pressure is thermodynamically analogous to that of increasing temperature, but that the effect is small. The results are consistent with the volume per Zr atom of the α, δ and ω phases, with the bulk moduli of α and δ, and with previous measurements of the hydrogen site molar volumes in the α and δ phases. The results are interpreted in terms of their implication for our understanding of the driving forces for hydride precipitation at crack tips, which are in a region of hydrostatic tensile stress on the order of 1.5 GPa.