Prediction of High-temperature Deformation Behavior in Precipitation Hardened Alloy with Ostwald Ripening

摘要

A predicting method was proposed of high-temperature deformation behaviorwith Ostwald ripening of Si precipitates for over-aging stage in AI-l.03mass % Si alloy based on the Void-hardening mechanism. The evaluation was carried out of the time dependence of strain, threshold stress, dispersion parameters of Si precipitates and stress-strain curves. The effects of temperature ranging from 523 K to 723 K and stress ranging from 6.7 MPa to 90 MPa on deformation behaviors were examined by this predicting method. The influenceof Ostwald ripening of Si precipitates on high-temperature deformation behaviourswas revealed in Al-Si precipitation-hardening alloy. The results were in good agreement with experimental ones.