摘要
钨作为散裂中子源固体靶的首选材料,钨的辐照损伤及氦行为研究被广泛关注。本文对高纯钨片进行常温氦离子注入,氦离子能量350 keV,注入剂量分别为1×10^(16),5×10^(16)和1×10^(17)ions·cm^(-2)。利用纳米压痕测量技术表征He注入前后钨的硬度变化,测试结果表明,氦离子注入后,钨出现辐照硬化现象,且随着注入剂量的增大,钨表面纳米压痕硬度增大;3个不同注入剂量样品的纳米压痕硬度值都随着测量深度先增大后降低。透射电镜(TEM)结果显示,氦离子注入后,钨内产生了氦离子聚集,形成氦泡,且随着注入剂量的增大,氦泡尺寸逐渐增大,氦泡密度提高。
Due to its high density,high melting point and high thermal conductivity,tungsten is used as a solid target material for spallation neutron source,such as UK spallation neutron source(ISIS)and China spallation neutron source(CSNS). Proton and neutron irradiation will produce a large amount of helium in tungsten,helium is easy to be trapped by vacancy,dislocation and other defects in the target material,forming clusters,and then forming helium bubbles. one of the most important research focuses on the irradiation effect of tungsten is the behavior of helium and the effect of helium on the mechanical properties of materials. In this study,the effects of irradiation and the introduction of helium bubbles on the mechanical properties of tungsten matrix were simulated by helium ion implantation. Helium ion implantation was carried out on high purity tungsten at room temperature. The helium ion energy was350 keV and the implantation dose was 1×10^(16),5×10^(16)and 1×10^(17)ions·cm^(-2). Monte Carlo code SRIM-2011 was used to simulate the implantation depth,helium concentration and irradiation damage of helium ion implanted tungsten. SRIM simulation results showed that the maximum implantation depth of 350 keV helium ion in tungsten was about 1 μm,the maximum helium ion concentration was5.1%(atom fraction)at 650 nm. The hardness changes of tungsten before and after helium implantation were characterized by nanoindentation technique. The maximum irradiation damage of tungsten was 0.9 dpa when the helium ion implantation dose was 1×10^(17)ions·cm^(-2). Nano-indentation hardness test results showed that irradiation hardening occurred after He ion implantation,before helium ion implantation,the nano indentation hardness of tungsten surface was 6.87 GPa,after helium ion implantation,the nano indentation hardness of tungsten sample surface increased,and increased with the increase of helium ion implantation dose,when the implantation dose was 1×10^(17)ions·cm^(-2),the nano indentation hardness reached the maximum of
作者
魏少红
陈怀灿
袁野
殷雯
纪全
赵海龙
Wei Shaohong;Chen Huaican;Yuan Ye;Yin Wen;Ji Quan;Zhao Hailong(Institute of High Energy Physics,Chinese Academy of Sciences(CAS),Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;School of Materials Science and Engineering Central South University,Changsha 410083,China;Beijing Aerospace Propulsion Institute,Beijing 100176,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2022年第11期1520-1525,共6页
Chinese Journal of Rare Metals
基金
国家重点研发计划项目(2017YFE0106100)
中科院高能所科技创新项目(2020-高功率靶材关键技术及辐照效应研究)
国家自然科学基金联合基金项目(U1932219)资助。
关键词
钨
氦离子
纳米压痕
氦泡
微观结构
tungsten
helium ion
nano-indentation
helium bubble
microstructure
