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Modified constitutive model and workability of 7055 aluminium alloy in hot plastic compression

7055 铝合金热压缩变形修正本构模型及热加工性

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Abstract

To obtain flow behavior and workability of 7055 aluminium alloy during hot deformation, hot compression tests at different temperatures and strain rates are conducted. True stress-strain curves of 7055 aluminium alloy under different conditions are obtained and the flow stress increases with ascending strain rate and descending temperature. For Arrhenius constitutive equation, each material parameter is set as a constant, which will bring forth large error for predicting flow behavior. In this work, material parameters are fitted as a function of temperature or strain rate based on experimental results and a modified constitutive equation is established for more accurate prediction of flow behavior of 7055 aluminium alloy. The effects of temperature and strain rate on power dissipation and instability are analyzed to establish a processing map of 7055 aluminium alloy. The dominant deformation mechanism for microstructure evolution at different deformation conditions can be determined and high efficiency of power dissipation may be achieved from power dissipation map. Meanwhile, proper processing parameters to avoid flow instability can be easily acquired in instability map. According to the processing map, optimized processing parameters of 7055 aluminium alloy are temperature of 673–723 K and strain rate of 0.01–0.4 s−1, during which its efficiency of power dissipation is over 30%. Finite element method (FEM) is used to obtain optimized parameter in hot rolling process on the basis of processing map.

摘要

为了获得热变形中7055 铝合金流变行为及热加工性, 开展材料在不同温度和应变速率下热压 缩实验. 基于实验获得7055 铝合金在不同变形条件下真应力-真应变曲线, 流变应力随着应变速率的 升高和温度的降低而增大. Arrhenius 双曲正弦本构方程中每个材料参数均设置为常数, 预测材料流变 行为时误差较大. 本文建立修正的Arrhenius 本构方程, 能更准确地预测材料高温流变行为, 根据热 压缩实验结果, 修正方程中每个材料参数均拟合为温度和应变速率的函数. 同时, 建立了7055 铝合 金热加工图, 分析了温度和应变速率对能量耗散及流变失稳因子的作用规律. 通过热加工图, 能获得 不同变形条件下材料主导变形机制; 通过能量耗散图, 能获得高效率的能量耗散; 通过流变失稳图能 获得合理的工艺参数, 避免热加工中的流变失稳现象. 通过热加工图, 可获得较优的7055 铝合金热 变形参数: 变形温度673∼723 K, 应变速率0.01∼0.4 s−1, 在该参数范围内能量耗散率超过30%. 基于 热变形图 采用有限元模型获得了该材料热轧变形较优的工艺参数.

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Authors and Affiliations

  1. College of Mechanic and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Tao Zhang  (张涛), Shao-hang Zhang  (张少航), Lei Li  (李磊) & Shi-hong Lu  (鲁世红)

  2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Hai Gong  (龚海)

Authors
  1. Tao Zhang  (张涛)
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  2. Shao-hang Zhang  (张少航)
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  3. Lei Li  (李磊)
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  4. Shi-hong Lu  (鲁世红)
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Correspondence to Tao Zhang  (张涛).

Additional information

Foundation item: Project(51175257) supported by National Natural Science Foundation of China; Project(BK20170785) supported by the Natural Science Foundation of Jiangsu Province, China; Project(BE2016179) supported by Science and Technology Planning Project of Jiangsu Province, China; Project(Kfkt2017-08) supported by Open Research Fund of State Key Laboratory for High Performance Complex Manufacturing, Central South University, China

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Zhang, T., Zhang, Sh., Li, L. et al. Modified constitutive model and workability of 7055 aluminium alloy in hot plastic compression. J. Cent. South Univ. 26, 2930–2942 (2019). https://doi.org/10.1007/s11771-019-4225-1

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  • DOI: https://doi.org/10.1007/s11771-019-4225-1

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