Creep of Ni-Al₂O₃ Type Dispersion strengthened alloys

Abstract

The dependence of steady state creep rate on temperature and stress was investigated an Ni-Al₂O₃ type dispersion strengthened alloys containing 1∼5 wt% alumina as extruded. The activation energy of steady state creep was about 70,000∼90,000 cal/mol. Steady state creep rate was proportional to σⁿ, where σ is the stress. The value of n, however, was 6∼12, being larger than 4 which was proposed theoretically by G.S.Ansell et al. on the annealed SAP type alloys.
It is considered that their theoretical equation need not be essentially modified by the substitution of the stress σ−σ₀ for σ using appropriately defined σ₀.