Zdorovets Maxim V, Dukenbayev Kanat, Kozlovskiy Artem L
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Astana 010008, Kazakhstan.
Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty 050032, Kazakhstan.
Materials (Basel). 2019 Jul 29;12(15):2415. doi: 10.3390/ma12152415.
This paper presents the results of a systematic study of helium swelling and the subsequent process of degradation of the near-surface layer of aluminum-based nitride ceramics. The samples were irradiated with 40 keV He ions at temperatures of 300 and 1000 K with a fluence of 1 × 10-5 × 10 ions/cm. The choice of radiation doses and temperature conditions was due to the possibility of simulating reactor tests of structural materials. It has been established that an increase in the irradiation fluence leads to the formation of large agglomerates of clusters of helium bubbles, as well as an increase in the degree of roughness and waviness of the surface with the formation of crater-like inclusions. In the case of irradiation at high temperatures, there was a slight decrease in the average size of helium inclusions compared with irradiation at room temperature. However, the density of inclusions and surface roughness were much higher. It is established that irradiation at room temperatures leads to a sharp decrease in ceramics density, as well as deformation of the crystal structure due to an increase in the density of dislocations and macrostresses in the structure. The decrease in ceramics density due to the formation of helium inclusions led to an increase in porosity and a defective fraction in the structure of the surface layer of ceramics.
本文介绍了对铝基氮化物陶瓷近表面层的氦气肿胀及后续降解过程进行系统研究的结果。样品在300K和1000K温度下用40keV的氦离子辐照，通量为1×10⁻⁵×10离子/cm。选择辐射剂量和温度条件是因为有可能模拟结构材料的反应堆试验。已经确定，辐照通量的增加会导致氦气泡团簇形成大的团聚体，以及表面粗糙度和波纹度增加，并形成坑状夹杂物。在高温辐照的情况下，与室温辐照相比，氦夹杂物的平均尺寸略有减小。然而，夹杂物密度和表面粗糙度要高得多。已经确定，室温辐照会导致陶瓷密度急剧下降，以及由于结构中位错密度和宏观应力增加而导致晶体结构变形。由于氦夹杂物的形成导致陶瓷密度下降，从而导致陶瓷表面层结构中的孔隙率和缺陷分数增加。
