时效温度对2519铝合金组织与力学性能的影响  

Effects of Ageing Temperature on Microstructure and Mechanical Properties of 2519 Aluminum Alloy

作　　者：李慧中[1] 梁霄鹏[1] 李洲[1] 郭菲菲[1] 张新明[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《机械工程材料》2008年第8期12-15,共4页Materials For Mechanical Engineering

基　　金：国家"973"重点基础研究发展规划资助项目(2005CB623706);中南大学博士后基金资助项目(2007-8);中国博士后基金资助项目(20070420828)

摘　　要：采用显微硬度、力学性能测试及透射电子显微镜分析等手段研究了2519铝合金在135~200℃时效时的力学性能与显微组织的变化规律。结果表明:2519铝合金在135,150℃时效响应缓慢,在165,180,200℃时效时具有明显的三阶段时效特征,即欠时效、峰值时效和过时效;随时效温度的升高达到峰值时效的时间逐渐缩短,分别为15,9,6 h;峰值硬度逐渐降低;分别为127,122,118 HV;随着时效温度的升高铝合金的塑性逐渐降低;适宜的时效温度为165℃。The microstructure and mechanical properties of 2519 aluminum alloy aged at 135-200 ℃ for different times were investigated by means of microhardness test and tensile test,transmission electron microscope analysis.The results show that aged at 135,150 ℃,2519 aluminum alloy responsed slowly.And aged at 165-200 ℃,three respective stages were observed during the ageing process and they are under-ageing,peak-ageing and over-ageing,respectively.Time of reaching peak-ageing was gradually shortened from 15 h to 6 ...

关 键 词：2519铝合金 时效温度 显微组织 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]