LF2M铝合金薄壁管材的热压缩变形行为及热加工图

Hot compression deformation behavior and processing map of LF2M aluminum alloy thin-walled tube

采用真空等温压缩实验机对LF2M铝合金薄壁环进行了等温恒应变速率压缩实验,研究该铝合金管材在应变速率为0.1～1 s^-1,变形温度为350～475℃条件下的变形行为。结果表明：在压缩过程中,随着应变的增加,LF2M铝合金薄壁管材的流动失稳区增大。在变形温度低于430℃时,可加工范围窄小;在变形温度高于460℃和低应变速率时,加工性良好。根据加工图及微观组织观察,确定的合理工艺参数是：变形温度为475℃,应变速率为0.01 s^-1。

The isothermal compression test with constant strain rate of LF2M aluminum alloy thin-walled tube was carried out by a vacuum isothermal compression machine. The hot deformation behavior of the alloy tube at strain rate of 0. 1-1 s^-1 and deformation temperature of 350-475 ℃ was investigated. The result show that the flow instability zone of the alloy thin-walled tube increases with the increasing of the strain during the compression process. When the deformation temperature is lower than 430 ℃,the processing window is narrow,and the alloy has good machinability at low strain rate and the deformation temperature above 460 ℃. According to the processing map and microstructure observation,the optimum deformation parameters for the alloy are as follows： the deformation temperature is 475 ℃,and the strain rate is 0. 01 s^-1.