Abstract Transition rings of 2219 Al-Cu alloy for tanks with diameters exceeding 5 m require superior mechanical properties. However, the coarsening and agglomeration of Al2Cu second-phase particles deteriorate the mechanical properties of large 2219 Al-Cu alloy rings manufactured by the conventional hot rolling process. An improved process, including warm rolling and cold compression, was performed for improving the mechanical properties of such rings. The results showed that warm rolling can facilitate the dispersion and fragmentation of Al2Cu particles and that cold compression can lead to a significant accumulation of dislocations, as compared with hot rolling. Dispersed Al2Cu particles were beneficial for uniform distribution of Cu in the Al matrix after heat treatment; fragmented Al2Cu particles were dissolved more sufficiently during heat treatment, with the assistance of a larger number of dislocations per unit volume. More uniform and higher Cu content in the Al matrix of the sample undergoing the improved process leads to a more uniform distribution, greater area fraction, and larger size of θ′ phases, and improved yield strength. The elongations of the samples undergoing warm rolling increased significantly because of the positive change of fracture behavior owing to refinement of Al2Cu particles.

中文翻译：

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变形温度对2219铝铜合金大环第二相演化及力学性能的影响

摘要 2219 铝铜合金过渡环用于直径超过 5 m 的储罐，需要优异的机械性能。然而，Al2Cu 第二相颗粒的粗化和团聚使传统热轧工艺制造的大型 2219 Al-Cu 合金环的机械性能恶化。进行了包括温轧和冷压在内的改进工艺，以提高此类环的机械性能。结果表明，与热轧相比，温轧可促进 Al2Cu 颗粒的分散和破碎，冷压可导致位错的显着积累。分散的Al2Cu颗粒有利于热处理后Cu在Al基体中的均匀分布；在热处理过程中，在单位体积大量位错的帮助下，碎片化的 Al2Cu 颗粒溶解得更充分。经历改进工艺的样品的 Al 基体中更均匀和更高的 Cu 含量导致更均匀的分布、更大的面积分数和更大的 θ' 相尺寸，以及提高的屈服强度。由于 Al2Cu 颗粒细化导致断裂行为发生积极变化，因此温轧样品的延伸率显着增加。