采用热模拟实验研究2124铝合金在应变速率为0.01～10s~(-1)、变形温度为340～500℃条件下的流变应力行为.结果表明:2124铝合金热变形过程中的流变应力可用双曲正弦本构关系来描述,平均激活能为170.13kJ/mol.根据动态材料模型,计算并分析2124铝合金的加工图.利用加工图确定热变形的流变失稳区,并且获得了实验参数范围内的热变形过程的最佳工艺参数,其热加工温度为450℃左右,应变速率为0.01～0.1s~(-1).
The flow stress behavior of 2124 aluminum alloy during hot compression deformation was studied by thermal simulation test, under the conditions of the strain rate range of 0.1-10s~(-1) and the temperature range from 340-500℃.The results showed that the flow behavior of 2124 aluminum alloy was described by the hyperbolic sine constitutive equation, and an activation energy of 170.13kJ/mol was calculated.The processing maps were calculated and analyzed according to the dynamic materials model.The instability zones of flow behavior can be recognized by the maps.The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the maps, which the hot temperature was around 450℃ and the strain rate is 0.01-0.1s~(-1).
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