Ａｌ‐１％Ｍｎ合金の再結晶粒度に及ぼすＳｉの影響

Abstract

The precipitation and the recrystallized grain size in a high purity Al-1%Mn alloy containing 0.5%Si were investigated. Si in the unhomogenized Al-Mn alloy accelerates generation of a number of nuclei after in situ recrystallization depending on the annealing time. This type of nucleation occurs even at slow heating to an annealing temperature. Slow heating preferably leads to a fine grain structure in the unhomogenized Al-Mn alloy containing Si. If heated rapidly, prolonged annealing results in a fine grain structure. While, Si remarkably intensifies the effect of heating rate on the grain size of the homogenized Al-Mn alloy. A small amount of precipitation still occurs during annealing in the cold deformed material. The precipitation at about 300°C in the Al-Mn alloy containing Si prevents the nucleation. The grain size is considerably governed by the heating rate at such a temperature.