Abstract
The dependence of the steady-state creep rate on the temperature and stress was studied on Ni-Al2O3 type dispersion strengthened alloys containing 1∼5 wt% alumina as extruded. The activation energy of a steady-state creep was about 70,000∼90,000 cal/mol. The steady-state creep rate was proportional to σn, where σ is the stress. The value of n, however, was 6∼12, larger than 4 which was theoretically obtained on the annealed SAP type alloys by Ansell et al.
It appears that their theoretical equation needs not be essentially changed, if the stress σ in the equation is substituted σ-σ0 of which σ0 is the inversely reacting stress by effects of the extrusion process, etc.
