锻压技术

1420铝锂合金板材细晶化及超塑性能试验研究

英文标题：Experimental research on grain refining and superplasticity for 1420 Al-Li alloy sheet

分类号：

出版年,卷(期):页码：2022,47(3):65-71

摘要：

为了研究不同热轧工艺下的1420铝锂合金板材的高温拉伸力学性能，选取了厚度为7.3 mm的1420铝锂合金板材，首先进行了高温轧制试验，获得其最佳轧制工艺和成形条件。通过热轧工艺获得的板材的可利用率高，在每道次15%的压下量下板材不完全细晶化，其伸长率大幅度提高。其次，在MTS810拉伸试验机上进行了475 ℃下的高温拉伸试验，分析了轧制工艺对板材伸长率的影响。结果表明：板材的晶粒细化作用对伸长率的影响更大，当应变速率为0.8×10-3 s-1时，伸长率在300%以上，符合最佳超塑成形工艺条件。最后，通过金相分析观察了不同制备工艺下板材的微观组织结构，发现每道次压下量的增加，阻碍了位错运动，试验结果为1420铝锂合金板材的大规模工业化应用提供了理论依据。

In order to study the high-temperature tensile mechanical properties of 1420 Al-Li alloy sheets under different hot rolling processes, 1420 Al-Li alloy sheet with the thickness of 7.3 mm was seclected, the high-temperature rolling test was carried out, and the optimal rolling process and forming conditions were obtained. However, the sheet obtained by the hot rolling process has high availability, the sheet is not completely fine-grained at a reduction amount of 15% in each pass, and the elongation is greatly improved. Then, the high-temperature tensile test at 475 ℃ was conducted by tensile testing machine MTS810, and the influence of the rolling process on the elongation of sheet was analyzed. The results show that the grain refinement of sheet has a greater influence on the elongation. When the strain rate is 0.8×10-3 s-1, the elongation is above 300%, which is in line with the optimal superplastic forming process conditions. Finally, the microstructures of sheet under different preparation processes were analysed and observed by metallographic phase. And it is found that the increase of the reduction amount per pass hinders the movement of dislocations. Thus, the test results provide a theoretical basis for the large-scale industrial application of 1420 Al-Li alloy sheet.

基金项目：

国家自然科学基金青年科学基金资助项目（51905512）

作者简介：刘昊天（1998-），男，硕士研究生 E-mail：15797896151@163.com 通信作者：肖瑞（1985-），男，博士，工程师 E-mail:xiaoruidiablo@163.com

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