The study systematically investigated the impact of asymmetric rolling (AR) and subsequent aging treatment on the microstructure and mechanical properties of Al–Cu–Li–TiC/TiB alloy. The average grain size of the as-cast A0 and A1 alloys was 249.87 μm and 38.2 μm, respectively. The grain size was significantly refined by TiC and TiB particles. The texture of A0 and A1 samples after symmetric rolling (SR) was dominated by the β-fiber, including typical Copper, S, and Brass rolled textures. The core of the board has a relatively high proportion of Brass texture. The grain size of the AR sheet increases gradually from the surface to the center, with the middle to fast (MF) layer having the largest grain size. The middle to slow (MS) layer has the highest strength of Goss texture, indicating that the shear bands formed by AR are mostly located in the MS layer. A significant amount of T precipitate was observed in the aged sample, and a new T phase composite with a thickness of 1.426 nm was found in the AR sample. The structure of the composite consists of two parallel T precipitates with Al–Cu layer atoms at the center. The growth behavior of the composite is such that the new T precipitate adheres to one side of the original T precipitate and grows parallel in the form of T-T. In the T85 state, the A0SR samples exhibit a yield strength, tensile strength, and elongation of 503MPa, 518MPa, and 7.5%, respectively. The A1-SR samples exhibit a yield strength, tensile strength, and elongation of 520MPa, 526MPa, and 8.2%, respectively. The A0-AR samples exhibit a yield strength, tensile strength, and elongation of 553MPa, 572MPa, and 4.5%, respectively, while the A1-AR samples exhibit a yield strength, tensile strength, and elongation of 580MPa, 605MPa, and 5.2%, respectively. The increase in yield strength can be attributed to fine-grained strengthening, precipitation strengthening, and Orowan strengthening brought about by nano TiC/TiB particles.

中文翻译：

---

不对称轧制对Al-Cu-Li-TiC/TiB2合金组织和性能的影响

该研究系统地研究了不对称轧制（AR）和随后的时效处理对 Al-Cu-Li-TiC/TiB 合金显微组织和力学性能的影响。铸态A0和A1合金的平均晶粒尺寸分别为249.87μm和38.2μm。TiC 和 TiB 颗粒显着细化了晶粒尺寸。对称轧制（SR）后A0和A1样品的织构以β纤维为主，包括典型的铜、S和黄铜轧制织构。板芯黄铜质感比例比较高。AR片材的晶粒尺寸从表面到中心逐渐增大，其中中快速(MF)层晶粒尺寸最大。中慢（MS）层的Goss织构强度最高，表明AR形成的剪切带大部分位于MS层。在老化样品中观察到大量的 T 沉淀，并且在 AR 样品中发现了厚度为 1.426 nm 的新 T 相复合物。该复合材料的结构由两个平行的 T 析出物组成，其中 Al-Cu 层原子位于中心。复合材料的生长行为是新的T沉淀物粘附在原始T沉淀物的一侧并以TT的形式平行生长。在T85状态下，A0SR样品的屈服强度、拉伸强度和延伸率分别为503MPa、518MPa和7.5%。A1-SR样品的屈服强度、拉伸强度和伸长率分别为520MPa、526MPa和8.2%。A0-AR样品的屈服强度、拉伸强度和伸长率分别为553MPa、572MPa和4.5%，而A1-AR样品的屈服强度、拉伸强度和伸长率分别为580MPa、605MPa和5.2% ， 分别。屈服强度的提高可归因于纳米TiC/TiB颗粒带来的细晶强化、沉淀强化和Orowan强化。