固溶处理工艺对7449铝合金组织和性能的影响  

Effects of solution treatment on microstructure and properties of 7449 aluminum alloy

作　　者：钟利萍[1,2] 赵丽[1] 李保健 郑子樵[2] 周龙[1] 

机构地区：[1]中南林业科技大学机电工程学院,湖南长沙410004 [2]中南大学材料科学与工程学院,湖南长沙410083 [3]湖南博云新材料股份有限公司,湖南长沙410205

出　　处：《金属热处理》2013年第10期14-17,共4页Heat Treatment of Metals

基　　金：总装"十一五"预研项目(51312010409)

摘　　要：通过硬度、电导率、拉伸试验及金相分析,研究了在460、475、490℃分别保温30、60、120 min的固溶工艺对7449铝合金组织和性能的影响。结果表明,475℃×1 h是该合金最优的固溶工艺,此时合金的综合性能最佳;且固溶处理+自然时效态合金的抗拉强度、屈服强度和伸长率分别为561.32 MPa、362.19 MPa、22.92%;合金的固溶处理过烧温度为490℃;在固溶处理中,固溶温度比保温时间对该合金性能的影响更大。The effects of solution processes such as heating at 460, 475, 490 ℃ and holding for 30, 60, 120 min respectively on microstructure and properties of 7449 aluminum alloy were studied by microhardness , conductivity and tensile tests as well as optical microstructure analysis .The results show that the optimal parameter of the solution process is 475℃×1 h, under this condition the alloy has the best properties .After 475 ℃×1 h solution treatment and natural aging , the alloy＇s tensile strength , yield strength and elongation are 561.32 MPa, 362.19 MPa and 22.92% respectively.The over-burned temperature of the alloy in solution treatment is 490 ℃.In the solution processing , effect of solution temperature is greater than that of holding time on properties of the alloy .

关 键 词：7449铝合金 固溶工艺 显微组织 力学性能 电导率 

分 类 号：TG146.2[一般工业技术—材料科学与工程]