【摘要】 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。更多还原

【Abstract】 Hot plastic deformation behavior of novel Al-Zn-Mg-Cu alloy was studied by isothermal compression at 300-450 ℃ and strain rate of 10-3-1 s-1.The processing map was developed on the basis of dynamic material model(DMM).The results show that the alloy exhibits steady-state flow characteristics and belongs to positive strain rate sensitized material during hot compression deformation.The efficiency of power dissipation is much higher at high temperature of 450 ℃ and low strain rate of 0.001 s-1,and the maximum is about 0.61.The optimum processing parameters obtained by the map in this experiment are in the temperature range of 390-410 ℃ and the strain rate range of 0.018~0.135 s-1.更多还原