Category Archives: An Introduction to Nuclear Materials

Helium Embrittlement

Helium gas is produced through transmutation of the component elements in aus­tenitic (FCC) stainless steels and other materials. This can lead to embrittlement behavior that cannot be eliminated by high-temperature annealing. Helium is practi­cally insoluble in metals and hence after generation, it tends to precipitate into bub­bles particularly when the temperature is high enough (>0.5Tm) for helium atoms to migrate. […]

Read more

Effect of Helium

In certain materials under neutron irradiation, there is no way of turning off the helium production as a means ofcontrolling void formation. So, in materials where helium is produced, helium bubbles are formed and contribute to the swelling behavior. Some details of helium production have been discussed in Section 6.2.3. In reality, void formation takes place under conditions of damage […]

Read more
1 2 3 21