时效制度对7150铝合金组织和性能的影响  

Effect of Aging on Microstructure and Properties of 7150 Aluminum Alloy

作　　者：樊喜刚[1] 蒋大鸣[1] 孟庆昌[1] 李念奎[2] 孙兆霞[2] 

机构地区：[1]哈尔滨工业大学分析测试中心,黑龙江哈尔滨150001 [2]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《热加工工艺》2006年第16期22-25,共4页Hot Working Technology

基　　金：哈尔滨市科技攻关项目(2004AA5BG018)

摘　　要：通过室温力学性能和电导率测试以及显微组织的透射电镜分析,研究了时效制度对7150铝合金组织、性能和电导率的影响。结果表明,120℃×6h+165℃(×6～12)h的二级时效使合金保持高的屈服强度(>600MPa),同时具有较高的电导率(>38%IACS)。120℃单级时效后,析出相尺寸为1￣5nm,分布均匀,主要为GP区和'η相。双级时效后,沉淀相主要为'η相和η相。双级时效制度保证合金具有较高强度的同时,提高了合金的电导率。The effects of aging treatments on microstructure and mechanical properties and electrical conductivity of 7150 aluminum alloy were studied, and the evolution of microstructure during the aging were investigated by using OM and TEM. The results show that the yield strength of the alloy is over 600 MPa after two step aging（120℃ ×6h＋165℃× 6-12h）. The dominant precipitates of the alloy are GP zones and η’ phase after one step aging at 120℃ ,its size is abeut 1-5nm.The main precipitates of the alloy are η＇ phase and η phase after two step aging. The two step aging treatment increase the electrical conductivity with a small decrease of strength as compared with that of one step aging treatment.

关 键 词：7150铝合金 时效 力学性能 电导率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]