铁掺杂对铝中氦行为的影响

通过离子注入技术在铝中引入Fe、He两元素，并采用X射线光电子能谱（XPS）、X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和热氦脱附谱（THDS）研究Fe掺杂对铝中离子注入氦行为的影响。结果表明，掺杂的Fe在铝基体中主要以原子团簇形式存在。预先掺杂的Fe原子对He+注入铝的表面鼓泡和热脱附行为有重要影响。且影响程度与掺杂Fe的剂量有关：小剂量掺杂后，能有效抑制表面鼓泡现象，并使气体释放延迟；高剂量掺杂后，将加剧He+的注入损伤，出现剥落甚至重复剥落现象，同时使低温区域气体释放增强。原因是，小剂量Fe掺杂后，铝中形成了高He捕陷能力的第二相沉淀，抑制了氦泡的迁移和生长，从而影响了铝中的微观结构演化和气体释放特性；高剂量Fe掺杂后，又会使这种抑制作用减弱。

Effect of Iron Doping on Helium Behavior in Aluminum

Fe and He atoms were introduced into aluminum via ion implantation, and the effect of Fe-doping on the ion-implantation helium behavior in aluminum was studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and thermal helium desorption spectrometry (THDS). The results indicate that the doped Fe mainly exist in the form of atomic clusters in the matrix, and the behavior of surface blistering and thermal helium desorption has a close dependence on the doped-Fe and its dose. Small dose of Fe doping will result in effective resistance of surface blistering and delay of gas release, while large dose doping can deteriorate the irradiation damage, leading to flaking and even repeated flaking on the surface, and the enhancement of gas release in lower temperature range. The reasons are interpreted as following: when small dose of Fe are implanted in aluminum, second phase precipitates of high He trapping ability will form in the matrix, restraining the mobility and the growth of helium bubbles. Consequently, the microstructural evolution and gas release character are affected. However, the resistance effect will be weakened when large dose of Fe is doped in aluminum.