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研究了350℃热轧和室温冷轧对8090合金超塑性的影响。变形结果表明,热轧态的8090 合金的最佳延伸率为530％,而冷轧的达到630％。透射电镜观察及晶界角度测量结果表明,冷轧试样获得了较小尺寸的位错胞,在超塑变形初期冷轧试样中的应变诱发再结晶比热轧的快。在δ=25％时,冷轧试样的大角度晶界(≥10°)分数为0.67。而热轧的只有0.48。研究指出,应变诱发再结晶对细化晶粒和提高大角度晶界分数的作用明显地影响合金的超塑性能。
The effects of hot rolling at 350 ℃ and cold rolling at room temperature on the superplasticity of 8090 alloy were studied. The deformation results show that the optimum elongation of hot-rolled 8090 alloy is 530%, while that of cold-rolled reaches 630%. Transmission electron microscopy and grain boundary angle measurements showed that cold-rolled specimens obtained disordered cells of smaller size, and strain-induced recrystallization in cold-rolled specimens was faster than hot-rolled in the initial stage of superplastic deformation. At δ = 25%, the large-angle grain boundary (≥10 °) fraction of the cold-rolled sample is 0.67. The hot-rolled only 0.48. It is pointed out that the effect of strain-induced recrystallization on the grain refinement and the improvement of the fraction of large-angle grain boundaries significantly affect the superplasticity of the alloy.