(北京航空航天大学 机械工程及自动化学院,北京 100083)
摘 要: 为了获得5A90铝锂合金板材在加热状态下的成形极限图,采用自行开发研制的热环境通用板材成形性能实验机以及网格应变自动测量分析系统,进行5A90铝锂合金板材在10 mm/min的变形速度和25~300 ℃变形温度范围内的成形极限图实验,研究了变形温度对成形极限曲线的影响规律。结果表明,5A90铝锂合金的成形极限曲线对温度表现出显著的敏感性,其位置的高低并随温度的升高而显著上升。同时,在实验数据的基础上建立了5A90铝锂合金在不同变形温度下的成形极限计算模型,为成形极限曲线的计算和预测提供了重要的依据。
关键字: 铝锂合金;温热变形;成形极限图;计算模型
(School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China)
Abstract:The hot sheet formability test machine and the grid measurement and analysis system were used to determine the forming limit diagram (FLD) of 5A90 Al-Li alloy sheet at various temperatures. The effects of forming temperature on the FLD were investigated experimentally at the forming speed of 10mm/min and in the forming temperature range of 25−300 ℃. The results show that the forming limit strain of 5A90 Al-Li alloy increases with increasing temperature. Furthermore, the FLD calculating model of 5A90 Al-Li alloy is built, which is the important foundation to predict the FLD of Al-Li alloy at any temperature.
Key words: Al-Li alloy; warm and hot deformation; forming limit diagram; calculating model