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利用应力应变曲线、热加工图,结合电子透射电子显微镜和背散射衍射技术研究在变形温度为350~510°C、应变速率为0.001~10 s-1时高钛6061铝合金的热变形行为。结果表明,该合金的热压缩变形流变峰值应力随变形温度的升高和应变速率的降低而降低;在实验参数范围内平均热变形激活能为185 k J/mol;建立了流变应力模型;该合金热变形时主要的软化机制为动态回复;根据材料动态模型获得了高钛6061铝合金的热加工图,最佳的热加工窗口温度为400~440°C,应变速率为0.001~0.1 s~(-1)。
The thermal deformation behavior of high titanium 6061 aluminum alloy at 350-510 ° C strain rate and 0.001-10 s-1 strain rate was investigated by means of stress-strain curve and hot working drawing combined with electron transmission electron microscopy and backscatter diffraction. The results show that the peak compressive strain of hot deformation decreases with the increase of deformation temperature and strain rate. The average heat deformation activation energy is 185 kJ / mol in the experimental parameter range. The flow stress model The main softening mechanism of the alloy during hot deformation is dynamic recovery. According to the dynamic model of the material, the hot working diagram of high titanium 6061 aluminum alloy is obtained. The optimum hot working window temperature is 400-440 ° C and the strain rate is 0.001-0.1 s ~ (-1).