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<p>The variation in plastic deformation strain of aluminum alloy during the quenching process results in the development of residual stress. The change in quenching cooling process will affect the aluminum alloy's microstructure and the plastic deformation behavior. However, there is a limited research on the impact of cooling rate on microstructure and subsequent plastic deformation. The existing constitutive models of aluminum mainly do not consider the influence of quenching rate and time, resulting in errors in deformation and residual stress prediction. The study aims to reveal the mechanism responsible for diverse plastic deformation characteristic from various rates’ quenching and develop a model for plastic deformation behavior difference describing. A representative aeronautical 7xxx series alloy, Al-5.7Zn-2.3&#xa0;Mg-2.2Cu (wt.%) alloy, was quenched at various cooling rates (5-15&#xa0;K/s) and then compressed at a Gleeble−3500 unit. The flow stress behavior is obtained, and the quenching microstructure is compared. The mechanism of plastic deformation behavior difference is analyzed and a revised model considering cooling thermal history and quenching transformation degree is developed to describe deformation behavior difference of as-quenched Al-Zn-Mg-Cu alloy. With the modified model, it is possible to obtain the flow stress corresponding to various quenching cooling histories. It is a crucial step for residual stress prediction when the model is integrated into the code for FEM software.</p>

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Effect of Quench Cooling Rate on Plastic Deformation in an As-Quenched Al-Zn-Mg-Cu Alloy: Experiments, Mechanisms, and Modeling

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Hai-hao Teng,
  • Yu-feng Xia

摘要

The variation in plastic deformation strain of aluminum alloy during the quenching process results in the development of residual stress. The change in quenching cooling process will affect the aluminum alloy's microstructure and the plastic deformation behavior. However, there is a limited research on the impact of cooling rate on microstructure and subsequent plastic deformation. The existing constitutive models of aluminum mainly do not consider the influence of quenching rate and time, resulting in errors in deformation and residual stress prediction. The study aims to reveal the mechanism responsible for diverse plastic deformation characteristic from various rates’ quenching and develop a model for plastic deformation behavior difference describing. A representative aeronautical 7xxx series alloy, Al-5.7Zn-2.3 Mg-2.2Cu (wt.%) alloy, was quenched at various cooling rates (5-15 K/s) and then compressed at a Gleeble−3500 unit. The flow stress behavior is obtained, and the quenching microstructure is compared. The mechanism of plastic deformation behavior difference is analyzed and a revised model considering cooling thermal history and quenching transformation degree is developed to describe deformation behavior difference of as-quenched Al-Zn-Mg-Cu alloy. With the modified model, it is possible to obtain the flow stress corresponding to various quenching cooling histories. It is a crucial step for residual stress prediction when the model is integrated into the code for FEM software.