Abstract In this study, one of the severe plastic deformation (SPD) techniques, Equal Channel Angular Pressing (ECAP) has been successfully applied to the Al-Cu-Li alloy AA2195 at 250 °C and the development of microstructure, texture and mechanical properties has been studied. A systematic analysis has been carried out by using EBSD and TEM to understand the microstructural features, and the nature of different precipitates presence in the alloy AA2195. Microstructural features indicate considerable grain refinement leading to an average grain size of 2.8 ± 0.7 μm after 4 ECAP passes. Continuous dynamic recrystallization (CDRX) has been identified as the mechanism that leads to the formation of fine grain structure in the alloy AA2195 during the warm ECAP process. TEM results confirm the distribution of strengthening precipitates δ′(Al3Li), β(Al3Zr) and T1(Al2CuLi) in the alloy. The overall texture has become weak after ECAP processing and has been simulated using Visco-plastic self-consistent simulation (VPSC). The evaluation of mechanical properties indicates a substantial increment in hardness, strength properties with a minor reduction of ductility after 4 passes. Low mechanical property anisotropy is expected in the processed AA2195 alloy due to its weak texture.

中文翻译：

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等通道角挤压 (ECAP) 对 Al-Cu-Li 合金 AA2195 织构、显​​微组织和力学性能演变的影响

摘要 在这项研究中，严重塑性变形 (SPD) 技术之一，等通道角挤压 (ECAP) 已成功应用于 250 °C 的 Al-Cu-Li 合金 AA2195 以及显微组织、织构和机械性能的发展。已被研究。通过使用 EBSD 和 TEM 进行了系统分析，以了解 AA2195 合金中的显微结构特征和不同析出物的性质。显微结构特征表明，在 4 次 ECAP 通过后，晶粒细化程度显着，导致平均晶粒尺寸为 2.8 ± 0.7 μm。连续动态再结晶 (CDRX) 已被确定为导致合金 AA2195 在温 ECAP 过程中形成细晶粒结构的机制。TEM 结果证实了强化析出物 δ'(Al3Li) 的分布，合金中的β(Al3Zr)和T1(Al2CuLi)。ECAP 处理后整体纹理变弱，并已使用粘塑性自洽模拟 (VPSC) 进行模拟。机械性能的评估表明硬度、强度性能在 4 道次后显着增加，而延展性略有降低。加工后的 AA2195 合金由于其质地较弱，预计机械性能各向异性较低。