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以1420铝锂合金作为实验材料,通过改变应变速率来探求最佳的超塑性变形条件,即延伸率大幅度提高和获得变形均匀的细小微观组织。研究发现当温度为480℃,应变速率为3×10-4s-1时可以获得最佳超塑性变形状态,此时延伸率δ=550%,流变应力σ=1.9 MPa。同时通过金相分析以及TEM微观组织观察发现,在此条件下的组织等轴性好同时晶粒分布细小均匀,出现了细小的再结晶亚晶粒,有助于超塑性变形的进行。
With 1420 Al-Li alloy as the experimental material, the optimum superplastic deformation conditions were explored by changing the strain rate, that is to say, the elongation was greatly improved and the fine microstructure with uniform deformation was obtained. The results show that the optimal superplastic deformation state is obtained when the temperature is 480 ℃ and the strain rate is 3 × 10-4s-1, the elongation δ = 550% and the flow stress σ = 1.9 MPa. At the same time, metallographic analysis and TEM microstructure observation show that the microstructure of the microstructure is uniform and equiaxed at the same time, and the fine recrystallized subgrains appear, which contributes to the superplastic deformation.