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.

Fig. 3 Microstructure evolutions of a deformed AA7085 alloy which were heated to 350°C (a, e), 400°C (b, f), 450°C (c, g) and 500°C (d, h) with heating rates of 1 (a, b, c, d) and 600°C/min (e, f, g, h).