Study on Hot Deformation Behavior of 5052+Er Aluminum Alloy
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摘要: 在Gleeble-3500型热/力模拟试验机上对5052+Er合金进行了高温压缩热变形, 研究了变形温度和应变速率对5052+Er合金高温压缩行为的影响。结果表明:当应变速率为0.01 s-1时, 真应力-真应变曲线表现出典型的动态再结晶特征;当应变速率为0.1 s-1和1 s-1时, 曲线表现出动态回复特征;继续增加应变速率至10 s-1时, 流变应力达到峰值后出现后锯齿状波动, 此时的合金已经发生了动态再结晶;随着变形温度的升高和应变速率的减小, 5052+Er合金的流变应力会逐渐减小;5052+Er合金热压缩变形的流变应力方程为:σ=$95.42\left\{\left(\frac{\dot{\varepsilon} \exp \left(\frac{155500}{R T}\right)}{2.69 \times 10^{18}}\right)\right\}^{0.1877}+\sqrt{\left(\frac{\dot{\varepsilon} \exp \left(\frac{155500}{R T}\right)}{2.69 \times 10^{18}}\right)^{0.3754}+1}$, 不同热变形条件下峰值应力的计算值与测量值的误差在10%以内。Abstract: The thermal deformation of 5052+Er alloy at high temperature was carried out with the Gleeble-3500 type thermal/force simulation test machine and the effects of deformation temperature and strain rate on the high temperature compression behavior of 5052+Er alloy were studied. The results show that when the strain rate is 0.01 s-1, the true stress-true strain curve presents typical dynamic recrystallization features; When the strain rates are 0.1 s-1 and 1 s-1, the curves are characterized with dynamic recovery; When the strain rate increases to 10 s-1, after the flow stress reaches the peak value, the zigzag wave appears, and the dynamic recrystallization of the alloy occurrs; With the increasing of the deformation temperature and the decreasing of the strain rate, the rheological stress of the 5052+Er alloy decreases gradually, and the rheological stress equation of the thermal compression deformation of 5052+Er alloy is σ=$95.42\left\{\left(\frac{\dot{\varepsilon} \exp \left(\frac{155500}{R T}\right)}{2.69 \times 10^{18}}\right)\right\}^{0.1877}+\sqrt{\left(\frac{\dot{\varepsilon} \exp \left(\frac{155500}{R T}\right)}{2.69 \times 10^{18}}\right)^{0.3754}+1}$, and the errors between the calculated values of the peak stress and the measured values under different thermal deformation conditions are lower than 10%.
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Keywords:
- 5052+Er alloy /
- high temperature compression /
- flow stress /
- constitutive equation /
- microstructure
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