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

Abstract

A predicting method was proposed of high-temperature deformation behaviorwith Ostwald ripening of Si precipitates for over-aging stage in Al-1.03mass% Si alloy based on the Void-hardening mechanism.The evaluation wascarried out of the time dependence of strain, threshold stress, dispersion parametersof Si precipitates and stress-strain curves. The effects of temperatureranging from 523K to 723K and stress ranging from 6.7MPa to 90MPa ondeformation 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 ingood agreement with experimental ones.