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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%。
Using a variety of rolling and annealing combination of the program were the same batch of aluminum alloy sheet processing, and the sample tensile test, the analysis of the rolling total compression rate and the impact of the annealing process on the elongation of the sample . The results show that the larger total rolling reduction is beneficial to improve the superplasticity of the material. The total compressibility of TM3 is 96.67% at 250 ℃ with a strain rate of 2 × 10-3s-1, 443% elongation, the microstructure analysis found that the larger the proportion of the sample equiaxed grains is, the better the superplasticity of the sample. On the basis of the optimal process scheme, the efficiency is improved by shortening the pre-annealing time, and Low-temperature superplasticity performance is not affected too much, the elongation of the sample still reaches 350% at 250 ℃.