Residual stresses and tetragonal phase fraction characterisation of corrosion tested Zircaloy-4 using energy dispersive synchrotron X-ray diffraction
Residual stresses and tetragonal phase fraction characterisation of corrosion tested Zircaloy-4 using energy dispersive synchrotron X-ray diffraction
复制标题
DOI：
10.1016/j.jnucmat.2012.07.025
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
E. Polatidis;P. Frankel;J. Wei;M. Klaus;R. Comstock;A. Ambard;S. Lyon;R. Cottis;M. Preuss
中科院分区：
文献类型：
--
作者：
E. Polatidis;P. Frankel;J. Wei;M. Klaus;R. Comstock;A. Ambard;S. Lyon;R. Cottis;M. Preuss
为了提高对燃料包壳应用中锆合金氧化机制的了解，通过同步加速器X射线衍射对360°C高压釜暴露不同时间后在Zircaloy-4上形成的氧化物进行了详细的残余应力和相分数分析。在过渡后的样品（220天），通过氧化物厚度的显着应力变化被发现为单斜相在各个氧化物层，最大的面内压应力位于朝向金属-氧化物界面和不连续的残余应力分布。这种不连续性的深度匹配以及在电子显微镜分析显示两个不同的氧化层之间的界面的深度。随着暴露时间的推移，四氢呋喃相的分析表明，在过渡之前和过渡期间，四氢呋喃相的总体积发生了变化。这些观察结果被放入先前提出的残余应力演化的背景下，以提供进一步的洞察相变和残余应力在确定Zr合金的腐蚀动力学的重要性。
To improve the understanding of the oxidation mechanism in zirconium alloys for fuel clad applications, detailed residual stress and phase fraction analysis was carried out for the oxides formed on Zircaloy-4 after autoclave exposure at 360°C for various times by means of synchrotron X-ray diffraction. In a post-transition sample (220days), significant stress variation through the oxide thickness was found for the monoclinic phase in individual oxide layers, with maximum in-plane compressive stresses located towards the metal–oxide interface and a discontinuity in the residual stress profile. The depth of this discontinuity matched well with the depth at which electron microscopy analysis showed an interface between two distinct oxide layers. Analysis of the tetragonal phase with exposure time demonstrated changes of the total volume of tetragonal phase before and during transition. These observations are put into the context of residual stress evolution presented previously, to provide further insight into the importance of phase transformations and residual stresses in determining the corrosion kinetics of Zr alloys.