Defects introduced by helium irradiation at different temperatures in W and W-5wt%Re alloy
Defects introduced by helium irradiation at different temperatures in W and W-5wt%Re alloy
复制标题
缺陷%20引入%20by%20氦%20辐照%20at%20不同%20温度%20in%20W%20和%20W-5wt%Re%20合金
DOI：
10.1016/j.fusengdes.2021.112746
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发表时间：
2021
影响因子：
1.7
通讯作者：
Xingzhong Cao
中科院分区：
文献类型：
--
作者：
Zhen Wang;Haibiao Wu;Te Zhu;Yamin Song;Peng Zhang;Baoyi Wang;Detao Xiao;Xingzhong Cao
在室温、200 °C、350 °C和500 °C下用50 keV氦离子辐照W和W-5wt%Realloy，研究了温度对样品中微缺陷和表面形貌的影响。利用慢正电子束多普勒展宽谱（DBS）、透射电镜（TEM）和扫描电镜（SEM）分别对亚表面缺陷和辐照损伤进行了表征。结果表明，氦离子辐照后产生了大量的空位型缺陷，尤其是在500 °C下，W合金的空位型缺陷高于W-5wt%Re合金，这表明Re在一定程度上限制了钨中空位型缺陷的行为。在不同的辐照温度下，观察到了晶隙扩大、晶粒脱落和气孔等表面辐照损伤。与W中观察到的珊瑚状结构相比，W-5wt%Realloy中观察到的是圆形物体和丘陵沟壑结构，并且两者都随着辐照温度的升高而增加和增长。通过对珊瑚状构造和丘陵沟壑构造形成机制的分析，推测珊瑚状构造与丘陵沟壑构造的差异性有关。
W and W-5wt%Realloy 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%Realloy, which indicated thatRerestricted 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%Realloy, and both of them increased and grew with the increase of irradiation temperature. It was speculated that the presence ofReled to the difference by analyzing the formation mechanism of the coral-like structure and the Hilly-gully structure.