Influence of Stacking Fault Energy on High Temperature Creep of Pure Metals

摘要

The creep characteristics of four pure metals with widely varying stacking fault energies (Ag, Cu, Ni and Al) were evaluated above 0.5 Tm. Creep tests were performed under conditions of constant atomic diffusivity and constant stress over the elastic modulus. The steady state creep rate was found to be a function of the stacking fault energy such that steady state creep rate is proportional to stacking fault energy (3.5). In addition, it was uncovered that the primary creep strain and the strain to fracture increased with increasing stacking fault energy and that the ratio of initial to steady state creep rate decreased with increasing stacking fault energy. (Author)