轧制总压缩率及退火工艺对5083铝合金低温超塑性的影响

Influence of total rolling compression ratio and annealing process on low temperature superplasticity of 5083 aluminum alloy

利用多种轧制与退火的组合工艺方案分别对同一批次铝合金板料进行加工,并进行了试样拉伸试验,分析了轧制总压缩率及退火工艺对试样伸长率的影响。研究发现:较大的轧制总压缩率有利于提高材料的超塑性,总压缩率为96.67%的TM3试样在250℃下以2×10-3s-1的应变速率进行拉伸,得到了443%的伸长率,微观组织分析发现,试样中等轴细小晶粒所占比率越大试样超塑性越好;在最佳工艺方案基础上,通过缩短前期退火时间,提高了效率,且低温超塑性性能并没有受到太大的影响,250℃下试样的伸长率仍达到了350%。

5083 aluminum alloy sheet was processed with several combined processes of warm rolling and annealing process .By use of tensile tests, influences of total rolling compression ratio and annealing process on elongation were analyzed .The results shows that maximum elongation of the 5083 aluminum alloy with total rolling compression ratio of 96.67%reaches 443%at 250℃with strain rate of 1 ×10-3 s-1 , which means that superplastic property is improved by increasing total compression ratio .Microstructure analysis shows that the more equiaxed fine grains of the specimens the better superplasticity .On the basis of the optimum processing , elongation of the samples prepared with simplified processing by shorten annealing time also reaches 350%, which contributes to improving efficiency .