镓元素与初始晶粒尺寸对小变形条件下纯铝再结晶行为的影响

Effects of Gallium Element and Initial Grain Size on Recrystallization Behavior of Pure Aluminum in Small Deformation

为了研究临界应变再结晶法单晶制备技术,对具有不同初始晶粒尺寸的纯铝与Al-1.8at%Ga合金在小变形条件下的再结晶行为开展了实验。结果表明,粗大纯铝晶粒可通过临界应变再结晶法制备,其临界应变量随再结晶退火温度的升高而降低。镓元素添加后提高了铝的晶界迁移速率,使得Al-1.8at%Ga合金的再结晶临界应变量小于纯铝。纯铝再结晶临界应变量随初始晶粒尺寸的减小而降低,粗大初始组织更适于临界应变再结晶法单晶制备。

In order to study the single crystal preared critical strain recrystallization method,the recrystallization behavior of pure aluminum and Al-1.8 at%Ga alloys with different initial grain sizes under small deformation conditions was investigated.The results show that,the coarse pure aluminum grains can be prepared by critical strain recrystallization,and the critical strain decreases with the increase of recrystallization annealing temperature.The grain boundary migration rate of aluminum increases with the addition of gallium,so that the recrystallization critical strain of Al-1.8 at%Ga alloy is smaller than that of pure aluminum.The critical strain of recrystallization of pure aluminum decreases with the decrease of the initial grain size,and the coarse initial structure is more suitable for the preparation of single crystals by critical strain recrystallization.