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在Gleeble-1500热模拟实验机上对Al-6Zn-2Mg-0.2Sc-0.1Zr合金进行等温压缩试验,建立了该合金在变形温度为350～500℃、应变速率为1～10 s-1条件下的热加工图。利用光学显微镜和扫描电镜观察了不同变形程度下合金的组织和热裂纹,确定了适宜的变形参数。结果表明:Al-6Zn-2Mg-0.2Sc-0.1Zr合金高温变形的峰值应力随变形温度的升高而降低,其适宜的热加工温度和应变速率范围为:T>440℃,1.4 s-1<ε<3.5 s-1,单道次变形量小于60%。
The isothermal compression test of Al-6Zn-2Mg-0.2Sc-0.1Zr alloy was carried out on a Gleeble-1500 thermal simulation machine. The results show that when the deformation temperature is 350-500 ℃ and the strain rate is 1-10 s -1 Hot processing diagram. The microstructure and thermal cracking of the alloy under different deformations were observed by optical microscope and scanning electron microscope, and the suitable deformation parameters were determined. The results show that the peak stress of high temperature deformation of Al-6Zn-2Mg-0.2Sc-0.1Zr alloy decreases with the increase of deformation temperature, and the optimum temperature range and strain rate range of T> 440 ℃ and 1.4 s-1 <ε <3.5 s-1, single pass deformation less than 60%.