Hydride reorientation in Zircaloy-4 examined by in situ synchrotron X-ray diffraction
Hydride reorientation in Zircaloy-4 examined by in situ synchrotron X-ray diffraction
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DOI：
10.1016/j.jnucmat.2016.05.029
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发表时间：
2016-09
影响因子：
3.1
通讯作者：
H. Weekes;N. Jones;T. C. Lindley;D. Dye
中科院分区：
文献类型：
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作者：
H. Weekes;N. Jones;T. C. Lindley;D. Dye
用原位X射线衍射研究了Zr-4合金拉伸试样在热机械循环过程中的应力再取向现象。结果表明，与轧制方向（RD）对齐的样品相比，沿着样品的横向（TD）加载导致更大程度的氢化物再取向。与径向取向的微应变相关的弹性晶格微应变已被揭示为大于周向取向的微应变，这是应变调节的结果。还观察到循环后氢化物重新分布的证据，即在施加应力时，α-Zr晶粒以更有利的取向，并且发现其行为高度依赖于加载轴。最后，已经表明，在多个循环中的热机械加载减少了溶解（TSSD，H）和沉淀（TSSP，H）期间氢的末端固溶度的差异。
The phenomenon of stress-reorientation has been investigated using in situ X-ray diffraction during the thermomechanical cycling of hydrided Zircaloy-4 tensile specimens. Results have shown that loading along a sample’s transverse direction (TD) leads to a greater degree of hydride reorientation when compared to rolling direction (RD)-aligned samples. The elastic lattice micro-strains associated with radially oriented hydrides have been revealed to be greater than those oriented circumferentially, a consequence of strain accommodation. Evidence of hydride redistribution after cycling, toα-Zr grains oriented in a more favourable orientation when under an applied stress, has also been observed and its behaviour has been found to be highly dependent on the loading axis. Finally, thermomechanical loading across multiple cycles has been shown to reduce the difference in terminal solid solubility of hydrogen during dissolution (TSSD,H) and precipitation (TSSP,H).