固溶处理对喷射成形7055铝合金组织及性能的影响  

Effect of solution treatment on microstructure and properties of spray formed 7055 aluminum alloy

作　　者：韩念梅 冯迪[2] 唐建国[3,4] 耿哲 石皋莲[1] HAN Nian-mei;FENG Di;TANG Jian-guo;GENG Zhe;SHI Gao-lian(Department of Precision Manufacturing Engineering,Suzhou Vocational Institute of industrial Technology,Suzhou 215104,China;School of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Non-ferrous Metal Materials Science and Engineering,Changsha 410083,China)

机构地区：[1]苏州工业职业技术学院精密制造工程系,江苏苏州215104 [2]江苏科技大学材料科学与工程学院,江苏镇江212000 [3]中南大学材料科学与工程学院,湖南长沙410083 [4]有色金属材料科学与工程教育部重点试验室,湖南长沙410083

出　　处：《材料热处理学报》2024年第7期44-52,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51474240,51801082);江苏省高校基础科学研究重大项目(23KJA460012)。

摘　　要：采用差示扫描量热仪(DSC)、扫描电镜(SEM)、电子背散射衍射(EBSD)技术、常温拉伸、剥落腐蚀试验等研究了固溶处理对喷射成形7055铝合金组织和性能的影响。结果表明:随着固溶温度的升高,合金中粗大第二相面积分数逐渐减小,AlZnMgCu相和Al_(2)CuMg(S)相基本回溶,只残留少量的Al_(7)Cu_(2)Fe相,亚晶尺寸和再结晶面积分数随着固溶温度的升高和固溶时间的延长而增大,导致抗拉强度先增大后减小。合金经470℃固溶处理2 h+时效处理后,抗拉强度、伸长率和剥落腐蚀性能分别为613.4 MPa、8.9%和EB+级。喷射成形7055铝合金的静态再结晶机制包括“原有晶界弓出机制”和“亚晶合并机制”。Effect of solution treatment on microstructure and properties of spray formed 7055 aluminum alloy was studied using differential scanning calorimetry(DSC),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD) technique,room temperature tensile testing and exfoliation corrosion testing.The results show that as the solution temperature increase,the area fraction of the coarse second phases in the alloy gradually decreases,and the AlZnMgCu and Al_(2)CuMg(S) phases basically dissolve into the matrix,leaving only a small amount of Al_(7)Cu_(2)Fe phase.The subgrain size and recrystallization area fraction increase with the increase of solution temperature and the increase of solution time,leading to an increase in tensile strength first and then a decrease.After solution treatment at 470 ℃ for 2 h and aging treatment,the tensile strength,elongation,and exfoliation corrosion resistance of the alloy are 613.4 MPa,8.9%,and EB+grade,respectively.The static recrystallization mechanism of the spray formed 7055 aluminum alloy includes the “original grain boundary bowing out mechanism” and the “subgrain merging mechanism”.

关 键 词：7055铝合金 喷射成形 固溶 再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]