Metal response to helium bubble formation

This is work due to Jon Zimmerman at Sandia. It’s a study of how helium bubble formation in a metal induces defect formation. As nanobubbles grow, they force the surrounding metal to respond. This movie is an animation of bubble growth in Pd. Each atom is colored by the value of its centro-symmetry parameter, which is a measure of local crystal order; only atoms at defects are visualized.