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Investigating the thermal stability of irradiation-induced damage in a zirconium alloy with novel in situ techniques
Acta Materialia ( IF 9.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.actamat.2017.11.051
M. Topping , T. Ungár , C.P. Race , A. Harte , A. Garner , F. Baxter , S. Dumbill , P. Frankel , M. Preuss

Abstract Zr alloys exhibit irradiation-induced growth and hardening which is associated with the defects and dislocation loops that form during irradiation. In this study, state-of-the-art in-situ synchrotron X-ray diffraction (SXRD) and transmission electron microscopy (TEM) techniques were used to investigate the stability of dislocation loops in two proton-irradiated Zr-Fe binary alloys in real time. Complementary data from both techniques show rapid annealing of a-loops occurs between 300 °C and 450 °C. Line profile analysis was performed on the SXRD patterns using the convoluted multiple whole profile analysis tool, to calculate the change in a-loop line density as a function of post-irradiation heat treatment temperature and time. At temperatures below 300 °C, no significant decrease in a-loop density was detected when held for 1 h at temperature. From this SXRD experiment, we calculate the effective activation energy for the annealing process as 0.46 eV. On-axis in-situ STEM imaging was used to directly observe a-loop mobility during heating cycles and confirm that a-loops begin to glide in the trace of the basal plane at ∼200 °C in a thin foil specimen. Such a-loop gliding events, leading to annihilation at the foil's surfaces, became more frequent between 300 and 450 °C.

中文翻译:

用新型原位技术研究锆合金中辐照损伤的热稳定性

摘要 Zr 合金表现出辐照诱导生长和硬化,这与辐照过程中形成的缺陷和位错环有关。在这项研究中,最先进的原位同步加速器 X 射线衍射 (SXRD) 和透射电子显微镜 (TEM) 技术用于研究两种质子辐照的 Zr-Fe 二元合金中位错环的稳定性。即时的。来自这两种技术的互补数据显示 a 环的快速退火发生在 300 °C 和 450 °C 之间。使用复杂的多重整体轮廓分析工具对 SXRD 图案进行线轮廓分析,以计算作为辐照后热处理温度和时间的函数的 a 环线密度变化。在低于 300 °C 的温度下,当在温度下保持 1 小时时,没有检测到 a 环密度的显着降低。从这个 SXRD 实验中,我们计算出退火过程的有效活化能为 0.46 eV。轴上原位 STEM 成像用于直接观察加热循环期间的 a 环迁移率,并确认 a 环开始在约 200 °C 时在薄箔样品中的基面轨迹中滑动。这种导致箔片表面湮灭的环形滑翔事件在 300 到 450°C 之间变得更加频繁。
更新日期:2018-02-01
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