作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《轻合金加工技术》 2004年第11期39-43,共5页

摘　　要： 采用硬度测量、拉伸力学性能测试、电导率测定、显微组织结构分析方法,研究了不同固溶、单级时效处理条件下7055铝合金的力学性能、电学性能和显微组织结构。结果表明,7055合金有很强的时效强化效应,时效初期,合金硬度和强度迅速上升,时效4h即接近硬度和强度峰值,达到峰值后合金的硬度和强度仍维持在很高的水平;时效过程中,固溶体分解析出η′(MgZn2)相,随时效时间延长,析出相增加;7055合金适宜的固溶-单级时效处理工艺为480℃1h,水淬,120℃24h时效。在此条件下,合金的抗拉强度、屈服强度、伸长率、布氏硬度和电导率分别为513N/mm2、462N/mm2、9.5%、HB172和29%IACS。 The microstructures, mechanical and electrical properties of 7055 aluminum alloy at different solution and single-aging treatments were studied using hardness test, tensile test, electrical conductivity measurement, XRD and microstructure analysis. The results show that 7055 alloy has strong aging strengthening effect. At the early stage of aging, the hardness and strength of the alloy increase rapidly, the peak strength and hardness were approached after aging for 4 h, then maintained at a high level for a long time. During aging, the solid solution decomposed and η′(MgZn_2) phase precipitated. The precipitates increase with the increasing of aging time. The suitable solution and single-aging treatment of 7055 alloy is 480℃ 1 h solution and water quenching, then aging at 120℃ for 24 h. At this condition, tensile strength, yield strength, elongation, hardness and electrical conductivity of the studied alloy are 513 N/mm^2, 462 N/mm^2, 9.5%, 172 and 29%IACS, respectively.

关 键 词： 固溶 时效处理 铝合金 显微组织结构 时效时间 析出相 布氏硬度 水淬 工艺 电学性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [金属学及工艺]