固溶-冷变形-时效工艺下超高强Al-Zn-Mg-Cu系铝合金的组织及性能  

Microstructures and Properties of Ultra-high Strength Al-Zn-Mg-Cu Aluminum Alloy under Solution-Cold Deformation-Aging

作　　者：许晓静[1] 朱金鑫[1] 郭云飞[1] 马文海[1] 王子路[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《稀有金属材料与工程》2017年第10期2981-2986,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学资金(51074079);江苏省高校科研成果产业化推进项目(JH10-37);江苏高校优势学科建设工程项目;江苏省高校研究生科研创新计划(CXLX12-0620)

摘　　要：采用X射线衍射分析(XRD)、电子背散射衍射分析(EBSD)、电导率测试、硬度测试、拉伸试验、晶间腐蚀试验和剥落腐蚀试验,研究了冷变形对超高强Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr铝合金组织及性能的影响。结果表明,相比传统固溶-时效工艺,合金在固溶-冷压缩-时效工艺下平均晶粒尺寸减小,硬度、电导率、小角度晶界比例、抗拉和屈服强度增大和抗腐蚀性能变好。在固溶-冷压缩-时效(100℃/24 h)工艺下合金的硬度、电导率、屈服、抗拉强度达到了2430 MPa、25.085%IACS、683.2 MPa和734.7 MPa,延伸率为6.1%,且晶间腐蚀深度为28.57μm,晶间腐蚀等级为二级。The effects of cold deformation treatment on solution microstructures and properties of a newly designed Al-13.01 Zn-3.16 Mg-2.8 Cu-0.204 Zr-0.0757 Sr alloy were investigated by tensile, hardness tests, XRD and EBSD analysis, inter-granular and exfoliation corrosion resistance experiments. The results show that compared to the traditional solution-aging, under solution-compression-aging average grain size of the alloy decreases, while the hardness, conductivity, low-angle grain boundaries ratio, tensile and yield strength increase, and corrosion resistance becomes better. Wherein hardness, conductivity, yield strength and tensile strength of the alloy reach 2430 MPa, 25.085% IACS, 683.2 MPa and 734.7 MPa, respectively, elongation is 6.1%, intergranular corrosion depth is 28.57 ？m, and intergranular corrosion rate is 2 under the solution-compression-aging（100 °C/24 h）.

关 键 词：Al-Zn-Mg-Cu超高强铝合金 冷压缩 组织和性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]