Abstract Aluminum alloy thin sheets are widely used to produce light-weight high-strength components and the sheets are generally quenched before forming (Q-F) to improve the final mechanical properties of components. However, the distortion in quenching will significantly affect the quality and stability of the following forming process. In this study, the distortion behavior of 2219 aluminum alloy thin sheets and its forming mechanism in quenching process were investigated through experiments and finite element analysis (FEA). The results indicate that, the quenched thin sheets basically present three distortion modes, namely saddle-shape, shovel-shape and arch-shape. The distortion modes of the quenched thin sheets are determined by the bending modes of distortion zone which is the zone of the thin sheet near the water surface. When the bending mode is one-half sine wave, the quenching thin sheets always show saddle-shape. However, for the cases where the bending mode changes to three-half sine wave and the bending of distortion zone is suppressed, the quenching thin sheets show shovel-shaped and arch-shaped distortion modes, respectively. The reasons behind the variations of the bending mode are finally analyzed based on a buckling criterion under laterally constrained conditions. These results will provide an in-depth understanding of quenching distortion behavior and lay a basic guidance for controlling the distortion of thin sheets in quenching process.

中文翻译：

---

铝合金薄板浸入淬火多模态畸变行为

摘要 铝合金薄板广泛用于生产轻质高强度部件，通常在成型前进行淬火（QF）以提高部件的最终机械性能。但是，淬火时的变形会显着影响后续成型工艺的质量和稳定性。本研究通过实验和有限元分析(FEA)研究了2219铝合金薄板在淬火过程中的变形行为及其形成机理。结果表明，淬火后的薄板基本上呈现鞍形、铲形和拱形三种变形方式。淬火薄片的变形模式由变形区的弯曲模式决定，变形区是薄片靠近水面的区域。当弯曲模式为二分之一正弦波时，淬火薄板总是呈鞍形。但在弯曲模态变为三半正弦波且畸变区的弯曲得到抑制的情况下，淬火薄板分别呈现铲形和拱形畸变模式。最后基于横向约束条件下的屈曲准则分析了弯曲模式变化背后的原因。这些结果将有助于深入了解淬火变形行为，为控制淬火过程中薄板的变形提供基本指导。淬火薄片分别呈现铲形和拱形畸变模式。最后基于横向约束条件下的屈曲准则分析了弯曲模式变化背后的原因。这些结果将有助于深入了解淬火变形行为，为控制淬火过程中薄板的变形提供基本指导。淬火薄片分别呈现铲形和拱形畸变模式。最后基于横向约束条件下的屈曲准则分析了弯曲模式变化背后的原因。这些结果将有助于深入了解淬火变形行为，为控制淬火过程中薄板的变形提供基本指导。