Annealing Behavior of Solution Treated and Aged Al-0.2wt% Sc Deformed by ARB
The effect of prior and subsequent precipitation on recrystallization behavior during the isothermal annealing of an Al-0.2%wt.Sc alloy heavily deformed by accumulative roll bonding (ARB) up to 10 cycles at ambient temperature was investigated. Three kind of different microstructures, i.e., solution treated one, 300°C pre-aged one and 400°C pre-aged one, were prepared as the starting structures for the ARB process. It is found that precipitation pinning effect of Al3Sc suppresses recrystallization and especially the 400°C pre-aging was effective to stabilize the ultrafine grained structure of the matrix. Dissolution of pre-aging Al3Sc precipitates was suggested by re-precipitation during annealing of the ARB processed specimens at around 300°C.
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
E. Borhani et al., "Annealing Behavior of Solution Treated and Aged Al-0.2wt% Sc Deformed by ARB", Materials Science Forum, Vols. 667-669, pp. 211-216, 2011