排序方式: 共有53条查询结果,搜索用时 15 毫秒
51.
52.
Two kinds of films were prepared to study the effect of microstructure on helium migration in Ti tritides. Both films showed different release behaviors and helium bubble distributions. In the film consisting of columnar grains, a twolayered structure was observed. Inclusions with a strip feature were found at the grain boundary, and no helium bubbles were distributed in these inclusions. However, helium preferred to migrate to the boundaries of these inclusions. Bubble linkage as a ribbon-like feature developed parallel to the film surface in the film consisting of columnar grains. More cracks were developed at the grain boundaries of the film consisting of columnar grains, although the helium content in the film consisting of columnar grains was less than that in the film consisting of equiaxed grains. A surface region with a small number of bubbles, or "depleted zone", was observed near the surface. The cracks extending to the film surface were the pathways of the critical helium released from the film. The helium migration was strongly influenced by the grain microstructure. 相似文献
53.
P-D背散射截面及质子在固体中的多次散射 总被引:1,自引:0,他引:1
报道了由质子束轰击Mo厚衬底上的氯化钛薄膜的背散射谱得出的P-D背散射的截面数据.由于P-D散射谱是叠加在P-Mo背散射谱上的,所以通过对服从卢瑟福截面公式的P-Mo背散射谱进行理论拟合而间接得出P-D背散射产额.讨论了质子在固体中的多次散射对P-Mo散射谱高度的影响,这种影响是不能忽视的,它使实验谱和不考虑多次散射效应而得出的理论谱有很大差异.并根据实验数据总结出了多次散射造成谱的升高对散射能量、散射深度、及散射角度的依赖关系. 相似文献