Investigation of the hardening behavior during recrystallization annealing in Al-Mg-Sc alloy

In this work, Al-3Mg-0.2Sc alloy with a single pass friction stir processing (FSP) was cold rolled, followed by recrystallization annealing. Hardening behavior was observed in cold rolled alloy after annealing treatment at 330 degrees C and 400 degrees C. The hardening phenomenon can be rationalized by a calculation between the Zener pinning (P-Z) and the driving force of recrystallization (P-D(Rex)). The result of contrastive calculation accords with the hardness change in the early stage of annealing, while the characteristics about coherency of Al3Sc particles determine that the contrastive calculation is inapplicable to later period of annealing. Specifically, the destruction of coherency between Al3Sc particles and matrix after annealing time exceeds 75 min makes that the actual value of P-Z is much less than the predicted value of calculation. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

In this study, the hardening behavior of Al-3Mg-0.2Sc alloy after cold rolling and recrystallization annealing was investigated. The hardening phenomenon was rationalized by calculating the Zener pinning and the driving force of recrystallization. The coherency between Al3Sc particles and matrix was found to affect the hardness change in the later period of annealing.