力学性能及微观组织的影响
(1. 中南大学 材料科学与工程系， 长沙 410083；
2. 西南铝加工厂， 重庆 4 01326)
摘 要: 对地铁列车车体用6005A铝合金进行了在线挤压淬火正交实验和透射电镜分析，研究了挤压温度、挤压速度、淬火方式对合金力学性能的影响。结果表明：淬火方式 对合 金性能的影响最大，水淬可使合金获得高的力学性能；提高挤压温度和挤压速度也可在一 定 程度上提高合金力学性能。透射电镜分析表明，在线挤压淬火工艺对合金力学性能的影响 实质上与β＇强化相的数量、大小、分布密切相关。
关键字: 地铁列车； 6005A合金；挤压；淬火
mechanical properties and microscopic structure of 6005A
alloys employed in underground railway trains
（1. Department of Materials Science and Engineering，
Central South University， Changsha 410083， P.R.China；
2. Chongqing Aluminum Fabrication Plant， Chongqing 401326， P.R.China）
Abstract: The effects of the extrusion temperature， extrusion speed，quenching way on the mechanical properties of 6005A alloys were studied by the on-li ne extr usion orthogonal experiments and transmitted electron microscopic analysis. T he results show that quenching way has the most obvious effect on the m echanical pr operties of the alloys. Water quenching can improve the mechanical prope rties of the alloys more. Improving extrusion temperature and extrusion speed can also d o to a certain extent. Transmission electron microscopic analysis shows tha t the effect of on-line extrusion quenching technique on the mechanical prop erties of the alloy is closely related to the amounts，the size and the distri bution of the β＇precipitated phase.
Key words: underground railway trains； 6005A alloys； extrusion； quenching
