“…Generally, when GBW occurs, in some cases above a transition temperature, it leads to detrimental mechanical properties with brittle fracture at the intergranular film. The known couples are Al/Sn, Cu/In, Al/Pb-Sn, Al/Ga, Al/Sn-Ga, Cu/Bi, Fe-Si/Zn, Mo/Ni, W/Ni, Zn/Sn and Ni/Bi [1,2]. The kinetics of such spontaneous processes can be truly astounding with GB penetration speed reaching hundreds of micrometers per second in the Al/Ga case or leading to disastrous brittle fracture or complete ruin of an otherwise ductile material like Cu/Bi [4,5].…”