An explanation was presented, for the temperature dependence of the plastic flow stress of III-V compounds, which involved only non-dissociated screw dislocations. With the aid of the Stillinger-Weber potential for interatomic interaction, the Peierls potential of a non-dissociated screw dislocation was derived for a 2-dimensional space that was normal to the dislocation line. A saddle-point configuration, and the formation energy of a kink pair, were calculated in 3-dimensional space. The relationship which was derived, between the flow stress and temperature under a constant strain-rate, described well the experimental flow stress versus temperature relationship for III-V compounds. It consisted of a strong temperature-dependence at high flow stresses and low temperatures, a stronger temperature dependence at low flow stresses and high temperatures and a plateau-like flow stress at intermediate temperatures. A hump in the flow-stress versus temperature relationship was attributed to a transition between different paths for the non-dissociated screw dislocation: these comprised a planar path, and a zig-zag path in the (111) plane.

Temperature Dependence of the Flow Stress of III-V Compounds. K.Edagawa, H.Koizumi, Y.Kamimura, T.Suzuki: Philosophical Magazine A, 2000, 80[11], 2591-608