Effects of Mo/Zr addition on deuterium retention in W-Y2O3 alloys
Effects of Mo/Zr addition on deuterium retention in W-Y2O3 alloys
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DOI：
10.1016/j.jnucmat.2021.153141
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发表时间：
2021-11
影响因子：
3.1
通讯作者：
Qiu Xu;K. Murotani;L. Luo;K. Sato;H. Tsuchida
中科院分区：
文献类型：
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作者：
Qiu Xu;K. Murotani;L. Luo;K. Sato;H. Tsuchida
Mo/Zr的加入进一步改善了W- y2o3合金的力学性能，从而通过y2o3纳米颗粒的加入改善了W的延展性。本文研究了少量添加Mo/Zr元素和fe离子预辐照对w - y2o3合金中D保留率的影响。W-1 wt.%Mo-0.25 wt.% y2o3和W-0.1 wt.%Zr-0.25 wt.% y2o3样品在5- kv能量的D2ions辐照下的最大辐照通量为1022D2/m2， fe离子在1 MeV能量下的辐照通量高达4 × 1018/m2。两种合金的D脱附量均随d2离子辐照量的增加而增加，与fe离子预辐照无关。与W-Y2O3相比，未经fe离子预辐照的两种合金的D脱附总量均有所增加。当2-离子辐照通量为1022D2/m2时，两种合金的辐照强度均有所降低。Mo/Zr的加入阻止了D从样品表面向内部扩散。因此，fe离子预辐照对添加Mo或zr的w - y2o3合金中D的脱附影响可以忽略不计。微量元素的加入使W合金的组织发生变化，对D的脱附有很大的影响。Mo的加入促进了d2离子辐照过程中位错环的形成。相反，Zr的加入使y2o3颗粒细化。这些缺陷作为D捕获位点，从而减弱了Fe离子的预辐照效应。
Mo/Zr were added to further improve the mechanical properties of W-Y2O3alloys, thus improving W ductility due to the addition of Y2O3nanoparticles. Herein, the effects of minor addition of elemental Mo/Zr and Fe-ion pre-irradiation on D retention in W-Y2O3alloys were investigated. The maximal fluence of W-1 wt.%Mo-0.25 wt.%Y2O3and W-0.1 wt.%Zr-0.25 wt.%Y2O3samples irradiated with 5-keV-energy D2ions was 1022D2/m2, and Fe-ion pre-irradiation was performed at ion fluences of up to 4 × 1018/m2at the energy of 1 MeV. For both alloys, the D desorption amount increased with increasing D2-ion irradiation fluence, regardless of Fe-ion pre-irradiation. Compared with W-Y2O3, the overall amount of the D desorption increased for both alloys without Fe-ion pre-irradiation. However, it decreased for both alloys with Fe-ion pre-irradiation, when the D2-ion irradiation fluence was 1022D2/m2. The addition of Mo/Zr prevented the diffusion of D from the surface to the inside of the sample. Therefore, Fe-ion pre-irradiation had a negligible effect on D desorption in the Mo- or Zr-added W-Y2O3alloys. Changes in the microstructures of the W alloy owing to the addition of minor elements strongly affected the D desorption. The addition of Mo promoted the formation of dislocation loops during the D2-ion irradiation. In contrast, the addition of Zr refined the Y2O3particles. These defects served as D trapping sites, thereby weakening the pre-irradiation effect of Fe ions.