Palladium is an attractive material for hydrogen and hydrogen-isotope storage applications due to its properties of large storage density and high diffusion of lattice hydrogen. One such application is the storage of tritium. Here, the material’s structural and mechanical integrity is threatened by both the embrittlement effect of hydrogen, and the creation and evolution of additional crystal defects (e.g. dislocations) caused by the formation and growth of helium-3 bubbles. Using recently developed inter-atomic potentials for the palladium-hydrogen and palladium-silver-hydrogen systems, we perform atomistic simulations of helium bubble growth. Our simulations show the evolution of a distribution of material defects (e.g. dislocations, stacking faults), and observations are made on how alloying affects the aging process. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.