热处理对Al-9.0Zn-2.5Mg-1.2Cu-0.12Sc-0.15Zr合金组织与性能的影响  

Effect of Heat Treatment on Microstructures and Mechanical Properties of Al-9.0Zn-2.5Mg-1.2Cu-0.12Sc-0.15Zr Alloys

作　　者：戴晓元[1] 夏长清[2] 

机构地区：[1]长沙理工大学汽车机械学院,湖南长沙410076 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2006年第2期1-4,共4页Hot Working Technology

基　　金：国家重点基础研究发展规划资助项目(国家973计划资助项目)(G1999064911-2)

摘　　要：通过差热分析和X射线衍射分析及硬度、拉伸性能和电导率测试,研究了热处理工艺对A l-9.0Zn-2.5M g-1.2Cu-0.12Sc-0.15Zr合金组织及性能的影响。结果表明:合金的峰值时效工艺为:120℃×22 h;综合性能最佳的热处理工艺为:120℃×22 h+180℃×30 m in+120℃×22 h的回归再时效处理(RRA)。经RRA处理,合金的σb为733.4 MPa,δ为5.4%,电导率为37.6%IACS。The microstructures and mechanical properties of Al-9.0Zn-2.5Mg- 1.2Cu-0.12Sc-0.15Zr alloys under different treatment conditions were investigated by hardness test, tensile properties, electric conductivity, DTA and X-ray analysis. The result shows that the peak aging occurs at 120℃ for 22h. When the aging treatment is RRA treatment （Retrogression and Re-ageing）： 120℃ ×22h＋180℃ ×30min＋ 120℃ ×22h, the synthetic properties is best. At this condition, the tensile strength, elongation and electric conductivity of studied alloy are 733.4 MPa, 5.44%, 37.6%IACS.

关 键 词：超高强铝合金 显微组织 力学性能 电导率 

分 类 号：TG166.3[金属学及工艺—热处理]