Al-1%MgおよびAl-1%Mg-0.6%Si合金の再結晶と粒成長に及ぼす不純物鉄の影響

抄録

Effects of Fe on the recrystallization behavior, resultant grains and their growth in Al-1mass%Mg alloys and in Al-1 mass%Mg-0.6mass%Si alloys, both of which contain small amounts of Fe (0.07-0.4%) as an impurity, were studied. Recrystallization of high purity Al-Mg alloy is hardly affected by homogenizing conditions for ingots. While, its recrystallization is significantly accelerated or retarded depending on the homogenizing temperatures when containing more than about 0.1mass%Fe. In Al-Mg-Si alloy, its recrystallization is remarkably affected by homogenizing temperatures independently of existence of Fe. Fe also effectively works for generation of recrystallized grains in these two alloys. Furthermore, Fe has a significant retarding effect on the grain growth, and grain coarsening in these alloys at elevated temperatures is effectively prevented by contained Fe.