Hardening of self ion implanted tungsten and tungsten 5-wt% rhenium
Hardening of self ion implanted tungsten and tungsten 5-wt% rhenium
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DOI：
10.1016/j.jnucmat.2012.07.044
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发表时间：
2013-01-01
影响因子：
3.1
通讯作者：
Roberts, S. G.
中科院分区：
文献类型：
--
作者：
Armstrong, D. E. J.;Yi, X.;Roberts, S. G.
钨是未来核聚变托卡马克中最有前途的高温部件材料之一。在这项研究中，钨离子注入已被用来模拟中子在纯钨和钨5wt%的氚所造成的损害。这种损伤层只有300 nm深，因此传统的机械测试无法对其进行研究。纳米压痕已被用于测量硬度随六种损伤水平（0 dpa、0.07 dpa、0.4 dpa、1.2 dpa、13 dpa和33 dpa）的变化。在纯钨中，硬度增加被视为在接近0.8 GPa时饱和0.4 dpa。损伤结构的透射电子显微镜观察到在相同损伤水平下的环体积数密度的类似饱和。在5重量%的钨合金中，硬度的增加在0.07和1.2 dpa之间是恒定的，接近0.85 GPa。使用TEM测量的环体积数密度在该区域中也显示出很小的变化。在33 dpa的损伤水平下，硬度增加为2.88 GPa;这对应于使用原子探针断层扫描观察到的3-5 nm的小的纳米团簇的形成。(C)2012爱思唯尔有限公司版权所有。
Tungsten is one of the most promising materials for high temperature components in any future nuclear fusion tokamak. In this study tungsten-ion implantation has been used to simulate the damage caused by neutrons in pure tungsten and tungsten 5 wt% rhenium. This damaged layer is only 300 nm deep so conventional mechanical tests cannot be used to investigate it. Nanoindentation has been used to measure the change in hardness as a function of six damage levels (0 dpa, 0.07 dpa, 0.4 dpa, 1.2 dpa, 13 dpa and 33 dpa). In pure tungsten the hardness increase is seen to saturate by 0.4 dpa at approximate to 0.8 GPa. Transmission electron microscopy of the damage structure sees a similar saturation of the loop volume number density at the same damage level. In the tungsten 5 wt% rhenium the increase in hardness is constant between 0.07 and 1.2 dpa, approximate to 0.85 GPa. The loop volume number density as measured using TEM is also shows little change in this region. At a damage level of 33 dpa the hardness increase is 2.88 GPa; this corresponds with the formation of small 3-5 nm rhenium clusters as observed using atom probe tomography. (C) 2012 Elsevier B.V. All rights reserved.