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.
出处
《热加工工艺》
CSCD
北大核心
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)
关键词
超高强铝合金
显微组织
力学性能
电导率
ultra high strength aluminum alloy
microstructures
mechanical properties
electric conductivity
