Thermal evolution of microdefects in He ion irradiated W-Ni-Fe heavy alloy
Thermal evolution of microdefects in He ion irradiated W-Ni-Fe heavy alloy
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DOI：
10.1016/j.jnucmat.2022.153773
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发表时间：
2022-05
影响因子：
3.1
通讯作者：
Z. Wang;D. Xiao;T. Zhu;Yamin Song;Yongli Liu;Chao-hua Zhang;Peng Zhang;P. Kuang;Baoyi Wang;Xingzhong Cao;Haibiao Wu
中科院分区：
文献类型：
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作者：
Z. Wang;D. Xiao;T. Zhu;Yamin Song;Yongli Liu;Chao-hua Zhang;Peng Zhang;P. Kuang;Baoyi Wang;Xingzhong Cao;Haibiao Wu
为了研究He离子辐照后W-Ni-Fe重合金表面空位型缺陷的热演化及其与绒毛结构形成的关系，对97 W-2Ni-Fe合金进行了100 °C ~ 1000 °C的等时退火处理。用正电子湮没谱（PAS）表征了微缺陷的演化。热脱附光谱（TDS），扫描电子显微镜（SEM），和能量色散谱（EDS）被用来补充正电子湮没方法。97 W-2Ni-Fe合金经室温辐照和等时退火后产生大量空位型缺陷，正电子俘获的主要缺陷类型在RT-600 °C、600-800 °C和800-1000 °C三个阶段发生变化。SEM观察发现，在800 °C退火后的样品表面出现了大量的纳米级突起，这些突起是绒毛结构的种子。通过PAS、TDS、SEM等表征手段，发现绒毛结构的形成与空位型缺陷的运动密切相关。此外，我们还发现97 W-2Ni-Fe合金基体相中高密度的Ni和Fe作为He的捕获点，会加速He气泡的形核和长大，促进绒毛结构的生长。
To investigate the thermal evolution of vacancy-type defects and the relationship between the evolution of vacancy-type defects and the formation of fuzz structure on the surface of W-Ni-Fe heavy alloys irradiated with He ions, isochronal annealing treatments at temperatures from 100 °C to 1000 °C were conducted on the irradiated 97W-2Ni-Fe alloy. The evolution of microdefects was characterized by positron annihilation spectroscopy (PAS). Thermal desorption spectroscopy (TDS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to supplement the positron annihilation method. A large number of vacancy-type defects were produced in the 97W-2Ni-Fe alloy after irradiation at room temperature and isochronal annealing, and the main defect types of positron capture changed at three stages: RT-600 °C, 600–800 °C, and 800–1000 °C. SEM found that a large number of nanoscale protrusions appeared on the surface of samples annealed at 800 °C, and these nanoscale protrusions were seeds of fuzz structures. The formation of fuzz structure is closely related to the movement of vacancy-type defects by PAS, TDS, SEM, and other characterization methods. In addition, we found that the high density Ni and Fe in the matrix phase of the 97W-2Ni-Fe alloy as He capture points would accelerate the nucleation and growth of He bubbles and promote the growth of the fuzz structure.