固溶-冷变形-预回复对Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr铝合金组织与性能的影响  

Effect of solid solution-cold deformation-prerecovery on microstructure and properties of Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr aluminum alloy

作　　者：许晓静[1] 汪成松 郭云飞[1] 丁清[1] 黄晶[1] 朱金鑫[1] 杨帆[1] 

机构地区：[1]江苏大学先进制造与现代技术研究所,江苏镇江212013

出　　处：《材料热处理学报》2017年第1期37-42,共6页Transactions of Materials and Heat Treatment

基　　金：江苏大学研究生科研创新计划项目(KYXX_0031);国家自然科学基金资助(项目号51074079)

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,研究了固溶冷变形-预回复对超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr固溶组织、时效及性能的影响。结果表明,预回复对固溶冷变形态下超高强铝合金的性能改善作用不大。相比固溶—冷压缩—固溶—时效和固溶—冷压缩—预回复—固溶—时效工艺,合金在固溶—冷压缩—时效工艺下具有更优秀的平均晶粒尺寸,硬度、低角度晶界比例、抗拉强度、屈服强度和抗晶间腐蚀性能。其中固溶—冷压缩—时效工艺下合金的屈服、抗拉强度达到了683.2 MPa、734.7 MPa,伸长率为6.1%,且晶间腐蚀深度为23.81μm,晶间腐蚀等级为二级。相比另外两种工艺,该工艺下合金屈服强度的贡献主要是来自位错强化和低角度晶界强化。The effects of solid solution,cold deformation and prerecovery treatment on microstructure and properties of a new designed Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757 Sr alloy extrusions were investigated by means of tensile and hardness tests,XRD and EBSD technique,intergranular and exfoliation corrosion resistance experiments.The results show that prerecovery has little improvement to the properties of the super-high strength aluminum alloy in a state of solid solution-cold deformation.Compared to the solution-cold compression-solution-aging and solution-cold compression-prerecovery-solution-aging process,the solid solution-cold compression-aging process can improve the hardness,the tensile strength and yield strength of the alloy better.In addition to,this process has best refining effect of the average grain size,best inter-granular corrosion performance and highest proportion of low-angle grain boundaries.Under the solution-cold compression-aging process,the yield strength,tensile strength and elongation of the alloy are 683.2 MPa,734.7 MPa,6.1%,respectively,and the intergranular corrosion depth（ intergranular corrosion rank of 2） is 23.81 μm.Different from the other two processes,the improvement on the yield strength of the alloy under the solid solution-cold compression-aging process mainly due to the dislocation strengthening and low-angle grain boundary strengthening.

关 键 词：Al-Zn-Mg-Cu超高强铝合金 预回复 冷压缩 组织性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]