轨道交通车辆大型材用7005铝合金的热处理特性  

Heat treatment characteristic of 7005 Al alloy employed in railway trains

作　　者：王正安[1,2] 汪明朴[2] 李周[2] 杨文超[1] 肖从文[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学教育部有色金属材料科学与工程实验室,长沙410083

出　　处：《中国有色金属学报》2010年第6期1110-1115,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2006AA03Z517)

摘　　要：利用力学性能测量和透射电镜观察等手段对轨道交通车辆大型材用7005铝合金热处理特性进行研究。结果表明:该合金在线挤压淬火后于105℃时效时,随着时效的进行,开始阶段硬度上升很快,时效8h后,硬度(HB)达100HB;时效50h后,硬度(HB)可达125HB以上;此后随着时效时间的延长硬度上升缓慢,时效200h后,硬度仍未达到峰值;经(105℃,8h)+(155℃,8h)双级时效后,σb=395MPa,σ0.2=330MPa,δ=12%,硬度为117HB。合金在较高温度(155℃和180℃)单级时效及双级时效时间过长,均引起析出相粒子明显长大、粗化,导致合金强度降低。The heat treatment characteristic of the 7005 aluminum alloys was studied by mechanical properties measurement and TEM.The results show that,during the process of aging at 105℃after on-line quenching,the hardness（HB） of alloy increases quickly at first and reach about 100 HB after aging for 8h and 125 HB after 50 h,then the hardness increases slowly with increasing aging time,and the hardness does not reach the peak value even the alloy is aged for 200 h.After aging at（105℃,8 h） ＋（155℃,8 h） ,the mechanical properties of 7005 aluminum alloy areσb=395 MPa,σ0.2=330 MPa,δ=12%,117 HB.If the aging of alloy at high temperature（155℃,180℃） or the two-stage aging is too long,the precipitated phases of the alloy will grow and coarsen,and then the alloy strength decreases.

关 键 词：7005铝合金 热处理特性 淬火 时效 力学性能 

分 类 号：TG113.12[金属学及工艺—物理冶金]