含颗粒铝合金再结晶的择优取向晶粒数量密度的关联性

摘要

采用EBSD技术研究Al?(Mn)?Fe?Si合金等温退火后的再结晶晶粒结构.统计研究表明,在无沉淀反应条件下,在大于临界直径(约1.1μm)的颗粒相周围形成P取向({011}〈566〉)晶粒的频率约为2％.晶粒总数量密度与P、立方取向({001}〈100〉)晶粒的数量成线性关系.再结晶晶粒的总数量密度及典型取向(P、ND旋转立方{001}〈310〉、立方)晶粒的数量密度随轧制应变量增加而增加,并服从指数规律.%The recrystallized grain structure of Al?(Mn)?Fe?Si alloys after isothermal annealing was studied by electron backscatter diffraction (EBSD) technique. Statistical correlation suggests that the frequency of forming P-oriented ({011}〈566〉) grains at a particle larger than the critical diameter (about 1.1μm) is about 2％ when the effect of fine dispersoids and concurrent precipitation is negligible. The overall grain number density is correlated linearly with the number densities of P and Cube ({001}〈100〉) grains. The grain number densities of typical orientations (P, ND-rotated cube {001}〈310〉 and Cube) and the overall recrystallized grains increase as rolling strain increases, following a similar exponential law.