Annealing Behavior of Solution Treated and Aged Al-0.2wt Sc Deformed by ARB

摘要

The effect of prior and subsequent precipitation on recrystallization behavior during the isothermal annealing of an Al-0.2%wt.Se 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℃ pre-aged one and 400℃ pre-aged one, were prepared as the starting structures for the ARB process. It is found that precipitation pinning effect of Al_3Sc suppresses recrystallization and especially the 400℃ pre-aging was effective to stabilize the ultrafine grained structure of the matrix. Dissolution of pre-aging Al_3Sc precipitates was suggested by re-precipitation during annealing of the ARB processed specimens at around 300℃.