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

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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.