Effect of stacking fault energy on steady-state creep rate of face centred cubic metals

Abstract

Continuum elastic theory was used to establish the relationships between the force of interaction required to constrict dislocation partials, energy of constriction and climb velocity of the constricted thermal jogs, in order to examine the effect of stacking fault energy (SFE) on steady state creep rate of face centered cubic (FCC) metals. Values of the SFE exponent calculated for FCC metals ranged between 3.1 and 3.8; with a mean of 3.4, which was close to the accepted semi-empirical SFE exponent of 3.0; thereby confirming the suitability of the theory. The corresponding stress exponent obtained from the analysis was 5.0, which satisfied the condition that the stress exponent must be greater than 4.5 for pure FCC metals.