固溶温度对Al-2.5Cu-0.3Mg合金线材组织与性能的影响  

Effect of solution treatment temperature on microstructure and properties of Al-2.5Cu-0.3Mg alloy wire

作　　者：周泽宇 雷金琴[3] 肖翔 李冲[1] 刘永长[1] ZHOU Ze-yu;LEI Jin-qin;XIAO Xiang;LI Chong;LIU Yong-chang(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Chinalco Materials Application Research Institute Co Ltd,Beijing 102209,China;Northeast Light Alloy Co Ltd,Harbin 150060,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350 [2]中铝材料应用研究院有限公司,北京102209 [3]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《材料热处理学报》2024年第11期56-64,共9页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2023YFB3710501);中铝集团科技重大专项(HX2423)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、差热分析(DSC)和电子拉力试验机等研究了Al-2.5Cu-0.3Mg合金线材经不同温度固溶处理后的组织和性能。结果表明:冷拉拔态Al-2.5Cu-0.3Mg合金线材的晶粒沿变形方向拉长,组织内含有大量Al_(2)Cu相;经过495~510℃固溶处理后,组织发生完全再结晶;随着固溶温度的升高,Al_(2)Cu相逐渐回溶,DSC热焓值降低;经自然时效后组织内析出纳米级强化团簇,合金的抗拉强度、剪切强度和腐蚀性能逐渐提高;当固溶温度升高至510℃时,合金的剪切强度提高至257 MPa,点蚀深度降低至39μm。Microstructure and properties of Al-2.5Cu-0.3Mg alloy wire after solution treatment at different temperatures were studied using optical microscope(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),differential thermal analysis(DSC)and electronic tensile testing machine.The results show that the grains of the cold drawn Al-2.5Cu-0.3Mg alloy wire are elongated along the deformation direction,and there is a large amount of Al_(2)Cu phase in the microstructure.After solution treatment at 495-510℃,the microstructure undergoes complete recrystallization.As the solution treatment temperature increases,the Al_(2)Cu phase gradually dissolves,and the DSC enthalpy value decreases.After natural aging,nanoscale strengthening clusters precipitate within the microstructure,and the tensile strength,shear strength and corrosion performance of the alloy gradually increase.When the solution treatment temperature is increased to 510℃,the shear strength of the alloy increases to 257 MPa,and the pitting depth decreases to 39μm.

关 键 词：AL-CU-MG合金 铝合金线材 固溶处理 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]