退火温度对8111铝箔微观组织和性能的影响

Effect of annealing temperature on microstructure and properties of 8111 aluminum foil

以双辊铸轧工艺生产的8111铝合金为研究对象,研究了热处理工艺对其微观组织和性能的影响。结果表明,铸轧板材经过冷轧和均匀化处理后,组织均匀性改善,链状第二相消失,晶粒形貌由细长的纤维状变为等轴细小的再结晶晶粒。随着退火温度的升高,铝箔微观组织经历回复、再结晶和晶粒长大的过程,330℃保温2 h再结晶完成,平均晶粒尺寸约为42μm, 360℃退火时,平均晶粒尺寸最大,约45μm;在研究的退火温度范围内,铝箔基体中的第二相化合物的形貌未发生明显变化;随退火温度升高,铝箔抗拉强度呈下降趋势,退火温度为360℃时,抗拉强度最低为87 MPa,而伸长率呈现先增加后降低的变化趋势,330℃退火时伸长率最大为10.2%,且电导率呈先升高再下降趋势,330~360℃退火时电导率基本不变。

Effect of heat treatment process on microstructure and properties of 8111 alloy produced by casting and rolling process was studied.The results show that after cold rolling and homogenization treatment,the microstructure uniformity of the cast⁃rolling sheet is improved,the chain like second phase disappears,and the grain morphology changes from fiber to fine equiaxed recrystallized grains.With the increase of annealing temperature,the microstructure of the aluminum foil undergoes a process of recovery,recrystallization and grain growth.The recrystallization is completed when annealed at 330℃for 2 h,with an average grain size of about 42μm.When the annealing temperature is at 360℃,the average grain size is the largest,about 45μm.Within the studied annealing temperature range,there was no significant change in the morphology of the second phase compound in the aluminum foil matrix.With the annealing temperature increasing,the tensile strength of the aluminum foil shows a decreasing trend,reaching the minimum value of 87 MPa when the annealing temperature is 360℃,while the elongation shows a trend of first increasing and then decreasing,reaching the maximum value of 10.2%when the annealing temperature is 330℃,and the electrical conductivity shows a trend of first increasing and then decreasing,basically unchanged when the annealing temperature is 330⁃360℃.