基于加工图的7085铝合金热成形性能研究

针对7085铝合金航空构件的热加工工艺问题,对7085铝合金在300～450℃和0.0001～1 s-1条件下进行等温压缩实验,建立了7085铝合金热加工图并且分析了7085铝合金热成形性.结果表明:温度340～450℃、应变速率0.0001～1s-1为加工安全区;失稳区域为温度300～340℃、应变速率0.01～1 s-1,在此区域加工时,形成绝热剪切带且带内组织为剧烈拉长晶粒；潜在危险加工区域为温度300～340℃、应变速率0.0001～0.01 s-1;建议在温度340～410℃、应变速率0.0004～1 s-1选择工艺参数.

Hot Formability of 7085 Aluminum Alloy Based on Processing Map

Based on the heat processing technology of 7085 aluminum alloy aircraft parts, 7085 aluminum alloy in the temperature range of 300~450 °C and strain rate range of 0.0001~1 s-1 have been studied by hot compressing testing. Processing map of 7085 aluminum alloy was generated and hot formability was analyzed. The results demonstrate that the temperature range of 340~450 °C and strain rate range of 0.0001~1 s-1 is the processing safety area for hot deformation of the 7085 aluminum alloy. The flow instability region occurs in the temperature range from 300 °C to 340 °C and strain rate range from 0.01 s-1 to 1 s-1. The adiabatic shear bands are generated when 7085 aluminum alloy is deformed in the flow instability region. The structure of adiabatic shear banding is violently elongated grain. The potential processing dangerous area is in the temperature range from 300 °C to 340 °C and strain rate range from 0.0001 s-1 to 0.01 s-1. The optimal deformation processing parameters are the deformation temperatures ranging from 340 °C to 410°C and strain rates ranging from 0.0004 s-1 to 1 s-1.