Effect of 3 MeV Fe11+ ions pre-damage on blistering and deuterium retention in two tungsten grades
Effect of 3 MeV Fe11+ ions pre-damage on blistering and deuterium retention in two tungsten grades
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DOI：
10.1016/j.nme.2021.100973
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发表时间：
2021-03
影响因子：
2.6
通讯作者：
Xuexi Zhang;L. Qiao;Hong Zhang;Wenhao He;Y. Li;Peng Wang
中科院分区：
文献类型：
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作者：
Xuexi Zhang;L. Qiao;Hong Zhang;Wenhao He;Y. Li;Peng Wang
研究了3 MeV Fe11+离子预损伤对热轧多晶体钨(W)和再结晶钨(REC-W)两种钨材料在D等离子体辐照下的起泡和氚(D)存留的影响。在未损伤的W表面可区分出两种水泡，一种是粒内水泡，大小约为0.2~1.5mμm，另一种是粒间水泡，大小约为15~22μm，在未损伤的REC-W表面仅观察到粒内水泡。与未损伤的W相比，损伤W中的水泡尺寸增大，而水泡密度降低。然而，破损的REC-W表面没有起泡。对于W和REC-W，Fe11+离子的预损伤都能有效地抑制晶内水泡的形成。靠近和平行于样品表面的晶界对晶间起泡的形成起着重要作用。Fe11+离子辐照在W和REC-W样品中引入了大量的位错环和纳米空洞等缺陷。由于Fe11+离子的辐照，W和REC-W中的总D保持率显著增加，并在0.3dpa左右趋于饱和。相反，未损伤的W样品的总D保留率高于未损伤的REC-W样品，但损伤W和REC-W样品的总D保留率相当。
The effects of 3 MeV Fe11+ions pre-damage on blistering and deuterium (D) retention in two types of tungsten, polycrystalline hot-rolled bulk tungsten (W) and recrystallized tungsten (rec-W) exposed to D plasma have been investigated. Two kinds of blisters can be distinguished at the surface of undamaged W. One is intra-granular blisters with the size of ~0.2–1.5 μm, and the other is inter-granular blisters with the size of ~15–22 μm. Only intra-granular blisters are observed at the surface of undamaged rec-W. Compared to the undamaged W, the size of blisters in the damaged W increases, while the density of blisters decreases. However, there are no blisters at the surface of damaged rec-W. For both W and rec-W, Fe11+ions pre-damage can effectively inhibit the formation of intra-granular blisters. The grain boundaries close and parallel to the sample surface play an important role for the formation of inter-granular blisters. Fe11+ions irradiation introduces a large number of defects such as dislocation loops and nano-scale voids in W and rec-W samples. The total D retention in W and rec-W increases significantly due to the Fe11+ions irradiation and tends to be saturated at around 0.3 dpa. In contrast, the total D retention in the undamaged W is higher than that in the undamaged rec-W, but it is quite comparable in the damaged W and rec-W samples.