Neutron Incoherent Scattering Measurements on Hydrogen-Charged Zircaloy-4
Neutron Incoherent Scattering Measurements on Hydrogen-Charged Zircaloy-4
复制标题
充氢 Zircaloy-4 的中子非相干散射测量
DOI：
10.4028/www.scientific.net/msf.539-543.1443
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
P. Liaw
中科院分区：
文献类型：
--
作者：
E. Garlea;V. Garlea;H. Choo;C. Hubbard;P. Liaw
在 Zircloy-4 圆棒上进行中子非相干散射测量。使用 12.5 vol. 将样品装入 430 °C 的管式炉中。 % 氢气在氩气混合物中在 13.8 kPa 压力下持续 30、60 和 90 分钟。体积平均中子衍射测量表明氢化样品中存在面心立方δ氢化锆（δ-ZrH2）相。由于氢原子的非相干散射而导致的衍射轮廓中的背景的评估是通过在零能量转移附近和在固定的二θ值处进行非弹性扫描来进行的，其中只有平坦的背景并且没有相干散射。为了估计 Zircloy-4 样品中氢的相对含量，使用氢含量已知的样品校准非相干散射强度随氢含量的增加。还测量了圆棒内位置的背景散射，以绘制氢含量的分布图。
Neutron incoherent scattering measurements were conducted on Zircaloy-4 round bars. The specimens were charged in a tube furnace at 430 °C, using a 12.5 vol. % hydrogen in an argon mixture for 30, 60, and 90 minutes at 13.8 kPa pressure. The volume-average neutron diffraction measurements showed the presence of the face-centered-cubic delta zirconium hydride (δ-ZrH2) phase in the hydrogenated specimens. The assessment of the background in the diffraction profiles due to the incoherent scattering from the hydrogen atoms was carried out by performing inelastic scans around zero energy transfer and at a fixed two-theta value for which there was only flat background and no coherent scattering. To estimate the relative amount of hydrogen in the Zircaloy-4 samples, the increase in incoherent scattering intensities with hydrogen content was calibrated using samples for which the hydrogen content was known. Measurement of the background scattering from locations within the round bar was also performed to map the distribution of hydrogen content.