(color online) The morphology of helium nano-bubble releasing near the nickel surface as a function of the simulation time at He-to-vacancy ratio 3:1 for Z[111] crystallographic orientation at 300 K. (a) 4.25 ps, (b) 4.50 ps, (c) 4.75 ps, (d) 5.00 ps, (e) 10.00 ps, (d) 250.00 ps.