高純度アルミニウムの圧延率と再結晶温度の関係

抄録

The recrystallization temperatures of high-purity (99.998%, 99.992%, 99.9%) and commercial pure aluminiums (99.6%) were studied after cold rolling by following the variation of hardness and microstructure in the course of annealing.
It was found that the recrystallization temperature of 99.998% Al decreases proportionally to its reduction but those of aluminiums less than 99.992% purity become constant at the reduction of about 60%. The end temperature of recrystallization of 99.95% Al was the highest in the heavy reduction over 80%, but in the case of lighter reduction (20-30%) that of 99.6% Al was the highest. It was ascertained again that there exists a maximum point in recrystallization temperatures of pure aluminums between 99.9% and 99.99% purity in the heavy reduction.
The temperature range between beginning and end of recrystallization is remarkablly wide as such as 180°C in 99.998% Al, but those of 99.9 and 99.6% Al are very narrow as 50°-60° in the heavy reduction.
Furthermore, it was found the beginning temperature of recrystallization in 99.998% was 40°C in the heavy reduction as such as 95%, then it suggests to begin to recrystallize even at room temperature after heavy rolling.