Activation energies for high temperature creep of polycrstalline zinc

Abstract

Abstract The creep of polycrystalline zinc above 0.5 Tm (Tm = absolute melting temperature) appears to be controlled by two thermally activated processes acting additively. One process, predominating between 0.5 and 0.6 Tm 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 Tm 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.