论文部分内容阅读
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 investigated. The deformation results showed that the optimum elongation of hot rolled alloy 8090 was 530%, while that of cold rolled reached 630%. TEM, The results of the sector angle measurements show that the cold-rolled specimens have smaller dislocation cells, and the strain-induced recrystallization in cold-rolled specimens is faster than hot-rolled at the initial stage of superplastic deformation. When δ = 25% The large-angle grain boundary (≥10 ℃) fraction of the sample is 0.67, while the hot-rolled is only 0.48. The study shows that the effect of strain-induced recrystallization on grain refinement and high-angle grain boundary fraction obviously affects the superplasticity performance.