冷变形及热处理制度对5182铝合金薄板细晶组织的影响

Influence of cold deformation and heat treatment on fine-grains microstructure of 5182 aluminum alloy sheet

采用66%和80%冷变形量的5182铝合金薄板进行340℃~500℃高温快速退火及240℃~440℃长时退火试验。结果表明,大的冷变形量有助于试验合金的细晶强化,退火温度对其初次再结晶晶粒尺寸影响较小,高温退火有助于提高伸长率。大变形量的5182铝合金冷轧薄板应采用短时保温快速退火的方式防止初次再结晶晶粒长大,保证晶粒尺寸分布的稳定性。

The microstructure of 5182 aluminum alloy sheets cold deformed by 66% and 80% of original thickness is investigated through the high-temperature rapid-annealing process at temperatures ranging from 340 to 500℃ and ordinm annealing process at temper- atures ranging from 240 to 440℃. The results show that high degree of cold deformation con- tributes to fine grain size strengthening of 5182 aluminum alloy, annealing temperatures have less influence on grain size after primary recrystallization, high annealing temperature can help to increase material elongation. In order to keep stability of grain size distribution, we can apply rapid annealing process to prevent small grains from growing up in the 5182 aluminum alloy sheet with high degree of cold deformation after primary recrystallization.