W and W-5wt% alloy were irradiated by 50 keV helium ions at RT, 200 °C, 350 °C and 500 °C to investigate the influence of temperature on the microdefects and surface morphology in the sample. The microdefects in the subsurface region and the surface damage caused by irradiation were characterized by Doppler broadening spectroscopy (DBS) of slow positron beam, transmission electron microscope (TEM) and scanning electron microscopy (SEM), respectively. The results show that a large number of vacancy-type defects were produced after helium ions irradiation, especially at 500 °C, the vacancy-type defects of W alloy are higher than that of W-5wt% alloy, which indicated that restricted the behavior of vacancy-type defects in tungsten to some extent. The surface irradiation damage such as crystal gap enlargement, grain fell off and pores were observed at different irradiation temperatures. Compared with the coral-like structure observed in W, the circular objects and Hilly-gully structure were observed in W-5wt% alloy, and both of them increased and grew with the increase of irradiation temperature. It was speculated that the presence of led to the difference by analyzing the formation mechanism of the coral-like structure and the Hilly-gully structure.

中文翻译：

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不同温度下氦辐照在W和W-5wt%Re合金中引入的缺陷

在室温、200℃、350℃和500℃下对W和W-5wt%合金进行50keV氦离子辐照，研究温度对样品中微缺陷和表面形貌的影响。分别采用慢正电子束多普勒展宽光谱（DBS）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对亚表面区域的微缺陷和辐照引起的表面损伤进行了表征。结果表明，氦离子辐照后产生了大量的空位型缺陷，特别是在500 ℃时，W合金的空位型缺陷高于W-5wt%合金，这表明限制了其行为。在一定程度上抑制了钨中的空位型缺陷。观察不同辐照温度下晶隙增大、晶粒脱落、气孔等表面辐照损伤。与W中观察到的珊瑚状结构相比，在W-5wt%合金中观察到了圆形物体和丘陵沟壑结构，并且它们都随着辐照温度的升高而增加和长大。通过分析珊瑚状构造和丘陵沟壑构造的形成机制，推测是由于 的存在导致了这种差异。