This paper proposes a theoretical model in the predication of high-temperature creep rate of precipitation-hardening alloy. Theoretical calculations were carried out of the high-temperature creep rate to four types of aluminum alloy states: stable dispersion particles (P), precipitation-particles with solubilizing (Pd), with solubilizing and coarsening particles (Pdc) and pure matrix metal (M) by means of this model. The effects of temperature ranging from 0.58Tm to 0.70Tm (Tm: the absolute melting point of the matrix metal) and stress ranging from 3.5×10-4E to 1.0×10-2E (E: the Young's modulus of the matrix metal) on creep rate were examined in these alloy states. The influence of solubilizing and coarsening of particles on creep behaviours is significant in precipitation-hardening alloy.
