In-situ irradiations with 30 keV He⁺ were performed on tungsten in an investigation of the influences of irradiation temperature and fluence, pre-existing dislocation and sample thickness on dislocation loop evolution including interaction, density and size. Dislocation loops with b = 1/2<111> and b =<100> were found to form in tungsten during irradiation. The ratio of 〈100〉 loops was obviously affected by irradiation temperature, fluence, sample thickness and pre-existing dislocation lines. The interaction between high density helium clusters could stimulate the formation of 〈100〉 loops in irradiated W, which was verified by Molecular Dynamic (MD) simulations. In addition, the driving force for the 〈100〉 loop formation should also be attributed to the reaction of two 1/2<111> loop variants driven by long-time and elevated temperature irradiation. The pre-existing dislocation lines were found to have a profound effect on the size, density and Burgers vector of dislocation loops. Additionally, irradiation-induced defects were likely to be absorbed by the surface sinks of thin foil during ion irradiation, resulting in the formation of a denuded zone near the surface. The in-situ observation of irradiation defect evolution will lead to an improved fundamental understanding of irradiation damage process of tungsten serviced in fusion reactor.

对钨进行了30 keV He ⁺的原位辐照，以研究辐照温度和能量密度，预先存在的位错和样品厚度对位错环演化的影响，包括相互作用，密度和尺寸。b  = 1/2 <111>和b的位错循环发现在辐射期间在钨中形成= <100>。〈100〉环的比率明显受辐照温度，通量，样品厚度和预先存在的位错线的影响。高密度氦团簇之间的相互作用可以刺激被辐照的W中<100>环的形成，这已通过分子动力学（MD）模拟得到了验证。另外，＆lt; 100＆gt;环形成的驱动力还应归因于两个1/2 <111>环变体在长时间和高温辐射下的反应。发现先前存在的位错线对位错环的大小，密度和Burgers向量具有深远的影响。此外，在离子辐照过程中，辐照引起的缺陷很可能会被薄箔的表面沉陷吸收，导致在表面附近形成裸露区域。辐照缺陷演化的原位观察将使人们对聚变反应堆中使用的钨的辐照损伤过程有一个更好的基本了解。