A Simulation Model for Creep Deformation Behavior ofDispersion Hardened Alloys with Ostwald Ripening Particles

摘要

This paper proposes a theoretical model on the prediction of creep deformation of precipitation-hardeningalloys. Theoretical calculations were carried out on the creep rate to four types of alloy states: with stabledispersion particles (P), with dissolving precipitation-particles (Pd), with dissolving and coarsening particles(Pdc) and without any particles (M) by using this model. The influence of dissolving and coarsening of particleswas significant. The proposed model was applied to creep deformation of an Al-1.03 mass % Si alloy withOstwald ripening of Si precipitates. The evaluation was carried out on the time dependence of strain, thresholdstress and dispersion parameters of Si precipitates. The effects of temperature raging from 0.58Tm to 0.70Tm(Tm: the absolute melting temperature of the matrix metal ) and stress raging from 3.5×10~(-4)E to 1.0×10~(-2)E (E: theYoung’s modulus of the matrix metal) on the creep deformation were examined theoretically and experimentally.The theoretical results were in good agreement with experimental ones.