双级固溶对Al-8.2Zn-2.0Mg-2.3Cu合金微观组织及力学性能的影响  

Effects of two-stage solution treatments on microstructure and mechanical properties of Al-8.2Zn-2.0Mg-2.3Cu alloy

作　　者：吴琴 吕华钦 范才河[1] 刘宇轩 毛垚晶 武帅 WU Qin;LU Huaqin;FAN Caihe;LIU Yuxuan;MAO Yaojing;WU Shuai(School of Materials and Advanced Manufacturing,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学材料与先进制造学院,株洲412007

出　　处：《中国有色金属学报》2025年第4期1154-1166,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52271177);湖南省自然科学基金资助项目(2024JJ7163)。

摘　　要：采用SEM、TEM和室温拉伸测试等方法,研究了双级固溶对喷射成形挤压态Al-8.2Zn-2.0Mg-2.3Cu(质量分数,%)合金微观组织和力学性能的影响。结果表明:双级固溶处理可以显著减少残余第二相的体积分数,促进溶质原子在基体内的均匀分布,其对晶粒尺寸的影响不明显。在(450℃, 0.5 h)+(490℃,0.5 h)下固溶的合金经轧制+时效处理后综合性能最佳,其极限抗拉强度、屈服强度和伸长率分别为(757.3±14.7) MPa、(666.4±15.2) MPa和12.4%,硬度为(220.4±4.3)HV。强化机制模型计算结果表明,不同双级固溶处理样品经轧制+时效后,合金的组织特征和力学性能匹配良好,计算得到的极限抗拉强度和屈服强度与实验测得的结果吻合度高。The effects of two-stage solution treatments on the microstructure and mechanical properties of spray-formed and extruded Al-8.2Zn-2.0Mg-2.3Cu alloy were examined by SEM,TEM and room-temperature tensile testing.The results indicate that the two-stage solution treatment notably reduces the volume fraction of residual secondary phases and facilitates the uniform distribution of solute atoms within the matrix,its effect on grain size is not significant.After rolling and aging treatment with((450℃,0.5 h)+(490℃,0.5 h)+RD+(120℃,25 h)),the sample shows the optimal performances with the ultimate tensile strength,yield strength,elongation,and hardness of(757.3±14.7)MPa,(666.4±15.2)MPa,12.4%and(220.4±4.3)HV,respectively.The reinforcement model calculations indicate the strong compatibility between microstructure features and mechanical properties in the as-aged samples under various two-stage solution treatments,and the calculated results are in good agreement with the experimental data in the values of ultimate tensile strength and yield strength.

关 键 词：AL-ZN-MG-CU合金 双级固溶处理 力学性能 强化模型 

分 类 号：TG292[金属学及工艺—铸造]