The effects of Cu concentration on microstructure and tensile property of the Al-18Zn-xCu-2.0Mg-0.12Ti-0.4Zr-0.25Sc-0.25Y (x=0.5 wt%, 1.0 wt%, 2.0 wt%) alloys were investigated. The results showed that the precipitation process from the GP zone to η was expedited with increasing Cu concentration, necessitating careful control to enhance the material properties. Optimizing the Cu concentration can lead to superior tensile properties. The alloy with 0.5 wt% Cu exhibited a high tensile yield strength of 626 MPa and a 6% elongation.

中文翻译：

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Cu浓度对高Zn含量Al-Zn-Mg-Cu合金显微组织和拉伸性能的影响

研究了Cu浓度对Al-18Zn-xCu-2.0Mg-0.12Ti-0.4Zr-0.25Sc-0.25Y (x=0.5 wt%、1.0 wt%、2.0 wt%)合金显微组织和拉伸性能的影响。 。结果表明，随着 Cu 浓度的增加，从 GP 区到 η 的沉淀过程加速，需要仔细控制以增强材料性能。优化铜浓度可以带来优异的拉伸性能。含 0.5 wt% Cu 的合金表现出 626 MPa 的高拉伸屈服强度和 6% 的延伸率。