High-dome blisters formed by deuterium-induced local superplasticity

The high-dome blisters appearing on tungsten after deuterium plasma exposure at around 500K are considered to be generated by the diffusion and agglomeration of the deuterium-vacancy clusters, and this kind of deformation is called as deuterium-induced local superplasticity. There were cavities inside the blisters smaller than a few micrometers, whereas there were no hollow lids formed for some blisters greater than a few micrometers, which is contrary to the typical feature of blisters reported before.