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采用Gleeble-1500热模拟机进行恒温和恒速压缩变形实验,变形温度为300～450℃和应变速率为0.001～1 s-1,研究了新型Al-Zn-Mg-Cu合金的高温塑性变形行为,并根据动态材料模型(DMM)建立了合金的加工图。结果表明,合金高温压缩变形均存在稳态流变特征且属于正应变速率敏感材料;在实验范围内,变形温度450℃、应变速率0.001 s-1的高温低应变速率变形区域的功率散耗率最大,约为0.61;合金热变形的最佳工艺参数为:热加工温度390～410℃,应变速率0.018～0.135 s-1。
The Gleeble-1500 thermal simulator was used to conduct constant temperature and constant-speed compression deformation tests. The deformation temperature was 300-450 ℃ and the strain rate was 0.001-1 s-1. The high-temperature plastic deformation behavior of the new Al-Zn-Mg-Cu alloy , And according to the dynamic material model (DMM) established alloy processing diagram. The results show that all the samples have steady-state rheological characteristics under high temperature compression deformation and belong to positive strain rate sensitive materials. In the experimental range, the power dissipation rate of high temperature and low strain rate deformation zone with deformation temperature of 450 ℃ and strain rate of 0.001 s-1 The maximum is about 0.61. The optimum technological parameters of hot deformation are: hot working temperature 390 ~ 410 ℃, strain rate 0.018 ~ 0.135 s-1.