DYNAMICAL PROCESS OF BUBBLES AND PRECIPITATION IN GRAIN BOUNDARIES IN PLASMA FACED MATERIALS

按顺序开发等离子体面材料、损伤和空隙（或泡沫）等离子体面材料的演变过程，如奥地利模型合金、铁模型合金、SiC、Al_2O_3、Fe、Ni和Al，并已研究了原位电子显微镜与离子加速器一起使用。它在氦或氢化中发现了镍、铁和铝辐照，即对间类型分离环的核增强了对自间原子的欺骗。（或氢）-真空复合体。“泡沫在所有材料中被发现的地方的凝聚力审查了他们在布朗运动期间的凝聚力。”泡沫的差异及其大小和温度的依赖性是根据随机行走理论衡量的。在谷物边界上找到了氦泡沫预防和快速运动的方法。为了检验合金元素的精确度， STEM-EELS分析已经完成。它是清晰的，因为Cr被腐蚀了，Ni在Fe-16 Cr-17 Ni Austenitic Alloy中充满了泡沫表面。However， Cr在Ferritic Fe-9 Cr合金的泡沫表面上得到了充分利用。对泡沫移动性隔离合金元素的影响已被建议。SiC和Al_2O_3基质中的氦气泡稳定到1100 K，但它们被预先组装并容易在谷物边界上被捆绑。

In order to develop the plasma faced materials, damage and voids(or bubbles)swelling evolution process in plasma faced materials, such as austenitic model alloy, ferritic model alloy, SiC, Al_2O_3, Fe, Ni and Al, have been studied by in-situ electron microscopy with ion accelerator. It was found in Ni, Fe and Al irradiated with helium or hydrogen ions that the nucleation of interstitial type dislocation loops was enhanced by trapping of the self-interstitial atoms at helium. (or hydrogen) ・ vacancy complexes. The coarsening of the bubbles took place in all materials examined through their coalescence during their Brownian motion. The diffusivity of the bubble and its size and temperature dependence was measured according to the random walk theory. Helium bubble precipitation and rapid motion along grain boundaries was found out. To examine the precipitation of the alloy elements, STEM-EELS analysis was carried out. It was clarified that Cr was depleted and Ni was enriched on the bubble surface in Fe-16Cr-17Ni austenitic alloy. However, Cr was enriched on the bubble surface in ferritic Fe-9Cr alloy. Effects of the segregated alloy elements on the bubble mobility was suggested. Helium bubbles in SiC and Al_2O_3 matrixs were stable up to 1100K, but they precipitabed and easily coarsened along grain boundaries.