Effect of Heating Rate on Microstructure, Texture and Tensile Properties of AA7085

Abstract

The microstructure, texture and tensile properties of a deformed AA7085 alloy during solution treatment were investigated in the temperature range of 350 to 500°C with heating rates of 1 and 600°C/min. The results show that the alloy sheet solution treated with rapid heating rate exhibits a finer grain structure and narrower grain size distribution compared to the alloy sheet solution treated with slow heating rate, indicating that driving force is more important than sub-boundaries coalescence and mobility during rapid heating process. Heating rate affects the qualitative recrystallization textures, whereas it has no significant changes on the quantitative texture of the individual components. After two-stage ageing, the samples with low heating have slightly higher tensile properties than those with high heating rate.

Combined Effect of Pre-Strain at Elevated Temperature and Pre-Aging on Aging Strength and Microstructures of AA6082

“…While the effects of other factors such as the heating rate and pre-strain on the heat treatment have begun to attract researchers' attention. 7,8) Pre-strain has been reported to have a substantial effect on the precipitation behavior of AlMgSi alloys. 9,10) The dislocations introduced by pre-strain are believed to act as sink of quenched-in vacancies and avoid clustering at room temperature, thus suppress the negative effect of natural aging.…”