Activation energies for high temperature creep of polycrstalline zinc

Abstract

The creep of polycrystalline zinc above 0.5 T_m (T_m = absolute melting temperature) appears to be controlled by two thermally activated processes acting additively. One process, predominating between 0.5 and 0.6 T_m is believed to be associated with dislocation climb since the experimentally determined activation energy for creep is about equal to the energy for self- diffusion, namely, about 21.0 kcal per mole. The other process, predominating between 0.8 and 1.0 T_m is believed to be associated with prismatic slip since the activation energies for these two processes are both equal to about 38.0 kcal per mole.