The enhancement of the superconducting transition temperature Tcof tin by 100%, of bismuth-thallium by 32%, and of bismuth-lead by 22% due to plastic deformation is reported. It is found that the transition to the superconducting state is sharp. The resistivity ρ and the critical field Hc(0) are greatly affected. The electronic specific heat coefficient γ, the Debye temperature θD, the density of states at the Fermi surface N(0), and the coupling constant λ are computed for the undeformed and the deformed states. These parameters are also greatly affected by plastic deformation. The enhancement of Tccan be attributed to changes in θD and λ. © 1987 Plenum Publishing Corporation.