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本文以金属钨为研究对象,研究了高温He~+辐照对钨材料微观结构的影响.在800℃下用20keV的He~+辐照,辐照剂量分别为5×10~(19) He~+/m~2、1×10~(20) He~+/m~2以及5×10~(20) He~+/m~2,然后用透射电镜(TEM)对辐照前后样品的微观结构进行表征.研究结果表明,钨在800℃辐照下有位错环和气泡的产生,随着辐照剂量增加,氦泡的尺寸不断增大,但体密度变小;位错环尺寸变大,体密度变小,位错环不断消失重组,形成了明显的线状位错.并且由g·b=0不可见准则发现,钨在He~+辐照后有1/2〈111〉和〈100〉两种类型的位错环,且1/2〈111〉类型的位错环比例居多.
In this paper, the effects of He ~ + irradiation on the microstructure of tungsten materials were studied, and the irradiation doses of 20 keV He ~ + at 800 ℃ were 5 × 10 ~ (19) He ~ + / m ~ 2, 1 × 10 ~ (20) He ~ + / m ~ 2 and 5 × 10 ~ (20) He ~ + / m ~ 2 respectively. Then the transmission electron microscopy The results show that there are dislocation rings and bubbles in the tungsten irradiated at 800 ℃. The size of the helium bubble increases with the increase of irradiation dose, but the bulk density decreases. The dislocation ring size Becomes larger and the bulk density becomes smaller and the dislocation rings disappear and recombine, forming obvious linear dislocations. And the invisible criterion of g · b = > And <100> types of dislocation loops, and 1/2 <111> types of dislocation loops are mostly in proportion.