Influence of Applied Stress on Helium Bubble Growth in Nuclear Structural Materials

为了提高新型核裂变反应堆和聚变反应堆候选结构材料的抗氦脆性能，研究了高温应力作用下氦泡组织的演变。脆化似乎发生的临界气泡理论所描述的。结果表明，阻止晶界处气泡的生长对抑制脆性是有效的，而氦捕获在晶内沉淀物上的作用不大。

So as to improve the helium-embrittlement-resistance of candidate structural materials for innovative nuclear fission reactors and fusion ones, such as Fe-Ni-Cr austenitics and reduced activation ferritic steels, the evolution of helium bubble microstructure has been investigated under the stress at high temperatures. The embrittlement seemed to occur as described by critical bubble theory. It has been elucidated that the prevention of bubble growth at grain boundaries should be effective to the suppression of the embrittlement while helium capturing on intragranular precipitates provides little advantage.