Effect of dwell time between passes on recrystallization behavior of 4043 aluminum alloy

In this paper, the recrystallization behavior of 4043 aluminum alloy under the deformation conditions of dwell times of 1 s, 10 s, 30 s, and 90 s between passes was studied. The results show that when the inter-pass dwell time is increased to 10 s, the instability region in the material hot processing map disappears. Additionally, particle-stimulated nucleation (PSN) predominantly occurs at low deformation temperatures and in specimens with short inter-pass dwell times under high deformation temperatures. Importantly, at a deformation condition of 450 °C and a strain rate of 0.01 s⁻¹, when the inter-pass dwell time is increased to 90 s, the alloy texture type changes from a strong Goss texture to a strong rotated cube texture, with the primary recrystallization mechanism shifting from PSN to continuous dynamic recrystallization (CDRX). A longer dwell time of 90 s tends to achieve the maximum static softening rate and a higher recrystallization fraction (8.54%). These findings reveal the impact of inter-pass dwell time on the hot deformation behavior of 4043 aluminum alloy, providing theoretical guidance for industrial production.

The effect of dwell time on recrystallization behavior and the recrystallization mechanism of PSN were studied.