本研究结合硬度、室温拉伸测试以及电子背散射衍射 (EBSD) 和透射电子显微镜 (TEM) 等微观组织表征技术，研究了冷轧预变形量(0-20%)对峰时效 2219 铝合金板材力学性能的影响规律，利用改进的Orowan强化模型计算了各种强化机制对强度的定量贡献，探讨了冷轧预变形提高其强度的机理。结果表明，冷轧变形的引入提升了位错强化和沉淀强化效果，因此提高了板材峰时效后的强度；随着冷轧预变形量的增加，峰时效样品强度呈现先增大后降低再增大的变化规律。5%和20%的预变形可以促进析出相的形核和均匀分布，提高合金的强度和硬度，但10%的预变形会导致析出相的粗化和数量减少，使得析出强化效果降低，从而降低合金强度。本文的研究有助于深化对冷轧预变形提高2219铝合金强度的机理认识，为合适预变形量的选取提供了参考。

This study investigates the effects of cold-rolling pre-deformation (0?20%) on the mechanical properties of peak-aged 2219 Al alloy sheets via hardness, tensile tests, and microstructural characterizations (EBSD, TEM). Using the improved Orowan model, it quantifies strengthening mechanisms to explore how pre-deformation enhances strength. Results show cold-rolling pre-deformation improves dislocation and precipitation strengthening, increasing peak-aged strength. Strength first increases, then decreases, and increases again with pre-deformation. Specifically, 5% and 20% pre-deformation promote precipitate nucleation and uniform distribution, boosting strength/hardness, while 10% pre-deformation causes precipitate coarsening and reduction, weakening strengthening. This study contributes to a deeper understanding of the mechanism by which cold-rolling pre-deformation improves the strength of 2219 aluminum alloy and provides a reference for selecting appropriate pre-deformation amounts.