Study of cascade damage effects detected by dynamic behavior of helium bubbles

氦气泡动态行为检测级联损伤效应研究

基本信息

批准号：
14550654
负责人：
ONO Kotaro
金额：
$ 1.92万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550654/
关键词：
irradiation damage helium bubble electron microscopy fusion reactor materials Fe,Fe-9Cr alloy Cu lattice defect Fe Au ヘリウム電子顕微鏡 Fe-Cr合金

项目摘要

(1)Study of cascade damage effects detected by dynamic behavior of helium bubblesHigh energy (100-400keV) self-ions were irradiated to Au,Cu,Si,Fe and Fe-Cr alloys specimens, to which helium bubbles were pre-introduced by irradiation with 10keV helium ions, and the dynamical behavior of the bubbles during the irradiation of high energy self-ions was studied by in-situ IVEM observation at Argonne National Laboratory. Helium bubbles can be used as a sensor for the cascade damage. It was found that most of the bubbles showed Brownian type-random motion even under the irradiation with high energy self-ions at high temperature, but their mobility was depressed. But, a small number of the bubble were accelerated. The depression and the acceleration of the bubbles should be caused by absorption of vacancies and by direct collision with ions, respectively. At middle temperatures, random motion of the bubble did not occur and an intermittent motion of helium bubbles along a dislocation loop was … More induced under the irradiation with high energy self-ions. Easy motion of helium bubbles along the dislocation lines at these temperatures was revealed. At lower temperatures, a sporadic motion in a limited region was revealed and this could be caused by direct collision with the cascade damage.(2)Interaction of the bubble with dislocation and one-dimensional motion of dislocation loopsThe interaction of helium bubbles with the dislocation was comparatively strong. It was revealed that the small bubble was thermally mobile along the dislocation line and the other directions. Bubbles can be used as a sensor of the strain field in the dislocation.One-dimensional motion of the small interstitial type dislocation loops with the burgers vector 1/2<111> was studied during annealing or under the electron irradiation and it was revealed that the burgers vector changes to the other 1/2<111> or to <100> during the one-dimensional motion. At lower temperature, the number density of the loops increases in Fe-9Cr and it was suggested that one dimensional motion could be induced by their elastic interaction.(3)TDS(Thermal Desorption Spectroscopy) of helium and its correlation with a change of the microstructure in Fe,Fe-9CrTDS spectra from helium irradiated Fe and Fe-9Cr and the correlated microstructure changes were studied. During a constant heating of the specimen up to 1000℃, five TDS peaks were observed. The peaks at lower temperatures are correlated with the dislocation trapping and ones at higher temperatures are correlated with the bubble motion to the surface and alpha-gamma phase transformation. Chromium segregated to the bubble or dislocation loops could shift the TDS peaks to higher temperature in Fe-9Cr alloy. Less

(1)氦气泡动态行为检测级联损伤效应的研究用高能(100-400keV)自离子照射Au、Cu、Si、Fe和Fe-Cr合金试件，并预先引入氦气泡。采用 10keV 氦离子辐照，研究了高能自离子辐照过程中气泡的动力学行为阿贡国家实验室的原位IVEM观察发现，氦气泡可以作为级联损伤的传感器，发现即使在高温下高能自离子照射下，大多数气泡也呈现布朗型随机运动。，但它们的流动性被抑制，但是，少数气泡的抑制和加速应该分别是由空位的吸收和与离子的直接碰撞引起的。气泡没有发生，并且在高能自离子的照射下，氦气泡沿着位错环发生间歇性运动。在较低的温度下，氦气泡沿着位错线容易运动。揭示了有限区域内的零星运动，这可能是由与级联损伤的直接碰撞引起的。(2)气泡与位错的相互作用以及位错环的一维运动氦气泡与位错的相互作用位错较强，表明小气泡沿位错线具有热移动性，而小气泡可作为位错应变场的传感器。小间隙型位错的一维运动。在退火期间或在电子辐照下研究了汉堡向量 1/2<111> 的环路，结果表明汉堡向量会改变为另一个 1/2<111> 或<100>在一维运动过程中，Fe-9Cr中的环数密度增加，表明它们的弹性相互作用可以引起一维运动。(3)TDS(热解吸光谱)。研究了氦气照射的 Fe 和 Fe-9Cr 的 Fe、Fe-9CrTDS 光谱中显微结构变化的相关性，以及在样品持续加热至 100 ℃ 期间的相关显微结构变化。 1000℃时，观察到五个TDS峰，较低温度下的峰与位错俘获相关，而较高温度下的峰与气泡运动到表面以及铬偏析到气泡或位错环相关。 Fe-9Cr 合金中 TDS 峰向更高温度移动。