作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《材料工程》 2009年第1期37-40,共4页

摘　　要： 通过拉伸性能、维氏硬度测试和TEM分析研究了2A23时效成形铝合金的时效制度以及不同时效处理制度下该合金的显微组织和力学性能。结果表明:合金适宜的时效温度为170℃,时效时间为20h;S′过渡相为合金的主要强化相;时效前的预变形能促进S′相细小弥散析出,显著提高合金的强度;合金的强度随预变形量的增大而升高,但过大的预变形量又会导致塑性下降;合金最佳的预变形量为2.5%～5%。 Tensile test, Vickers hardness test and TEM analysis were used to study the aging treatments and the microstructures and mechanical properties under different aging treatments of 2A23 aluminum alloy for age-forming. The results show that the suitable aging temperature is 170℃ and aging time is 20h. S＇phase is the main strengthening phase of the alloy. The pre-deformation before aging can make Sr （Al2 CuMg） precipitation distribute more dispersively and homogenously, thus can greatly improve tensile strength. The strength of the alloy improves with the increasing of pre-deformation, but over pre-deformation resulted in the decreasing of the plasticity of the alloy. The favorable pre-deformation is about 2.5 %-5 %.

关 键 词： 铝合金 预变形 时效 显微组织 力学性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]