摘要
用He离子在高于2000 K的温度辐照高纯钨样品,研究了辐照参数对W表面形貌的影响.结果表明,在2300 K辐照后W样品的表面出现明显的氦泡生长引起的表面肿胀.随着氦离子剂量的提高氦泡破裂并产生表面孔洞,表面肿胀逐渐发展成交联的类似珊瑚状的钨丝状结构;随着离子能量的增大氦离子注入W样品的深度增大,促进了表面钨丝状结构的生长.辐照温度从2100 K提高到2400 K,表面自间隙钨原子的扩散增强,抑制了表面肿胀和钨丝状结构的生长,甚至使钨丝状结构退化.氦离子剂量和离子能量的增加都促进高温氦离子辐照后W材料表面钨丝状结构的产生和演变,而提高温度的影响则与其相反.
Abstract
Tungsten(W)is considered as one of the most promising plasma facing materials for fu-sion devices due to its excellent properties such as high melting point,high thermal conductivity,high sputtering threshold and low hydrogen isotope retention.In this study,high-purity tungsten blocks are irra-diated by helium(He)ions at temperatures＞2000 K,and the effect of changes in irradiation parameters on the evolution of the W surface morphology is investigated.The results show that at 2300 K,the sur-face of the W samples shows a significant swelling morphology due to the growth of helium bubbles.As the ion fluence increases,the helium bubbles rupture,accompanied by the appearance of surface holes,and further surface swelling gradually develops into cross-linked coral-like tungsten nanofilament struc-tures;With the increase of ion energy,the depth of helium ions injected into the W material increases,which promotes the growth of surface tungsten filament-like structures.When the temperature is changed from 2100 K to 2400 K,the temperature increase enhances the rapid diffusion of self-interstitial tungsten atoms on the surface,which leads to the suppression of the surface swelling and tungsten filament-like structure growth behavior,and even the degradation of the tungsten filament-like structure.The increase in both helium ion fluence and ion energy promotes the formation and evolution of tungsten filament-like structures on the surface of W materials after high-temperature He ion irradiation in the adopted range of experimental parameters,while the increase in temperature shows the opposite trend.
基金项目
国家重点研发计划(2017YFE0300106)
中央高校基本科研经费(DUT20JC20)
大连市科技之星项目(2020RQ136)
中央指导辽宁省地方科技发展基金(2022010055-JH6/1001)
中央高校基本科研经费(DUT21RC3066)
NETL
NSTL
万方数据