system
Given the following post, respond as if you're commenting on Reddit:
human
[The Flash] [Marvel] Can Barry phase through adamantium or vibranium?
gpt
If he can, it wouldn't be as easy as he could through other materials. Kitty Pride has been shown as having major difficulty passing through adamantium, and her powers actually do involve actually phasing out of alignment with space.

The Flashes basically vibrate themselves to the point that their molecular structure becomes loose enough that it can pass through otherwise solid materials.

I don't believe I've ever seen any of them actually use their phasing for more special materials than just regular stone and metals, however.