固溶工艺对7C04铝合金组织与性能的影响  

Effect of solution treatment process on microstructure and properties of 7C04 aluminum alloy

作　　者：郭旭东 邹仕军 卢影峰 龙泽熙 Guo Xudong;Zou Shijun;Lu Yingfeng;Long Zexi(School of Materials Science and Engineering,Northeastern University,Shenyang Liaoning 110819,China;The First Military Representative Office of the Shenyang Regional Military Representative Bureau of the Air Force Armament Department,Shenyang Liaoning 110850,China;Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang Liaoning 110850,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]空军装备部驻沈阳地区军事代表局驻沈阳地区第一军事代表室,辽宁沈阳110850 [3]沈阳飞机工业(集团)有限公司,辽宁沈阳110850

出　　处：《金属热处理》2025年第3期132-137,共6页Heat Treatment of Metals

摘　　要：通过硬度、导电率、拉伸试验及显微组织分析,研究了不同固溶温度(450/460/470℃×1 h)和固溶时间(470℃×0.5/1/2 h)+120℃×18 h时效处理对挤压态7C04铝合金力学性能、导电率和微观组织的变化规律。结果表明,当固溶温度为450~470℃、固溶时间为1 h时,随固溶温度升高,时效态合金中可溶第二相粒子逐渐溶解,强度、伸长率和硬度升高,导电率下降。当固溶温度为470℃,固溶时间为0.5~2 h时,随固溶时间延长,时效态合金中可溶第二相粒子的溶解程度上升,1 h后达到过饱和状态,继续延长时间,第二相粒子个数无明显变化,强度先升高后降低,伸长率和硬度不断升高,导电率先降低后升高。470℃×1 h固溶+120℃×18 h时效处理条件下,合金的力学性能可达到抗拉强度为645.3 MPa,屈服强度为585.0 MPa,硬度为182.53 HV3,导电率为27.59%IACS。Variation laws of mechanical properties,electrical conductivity and microstructure of extruded 7C04 aluminum alloy solution treated at 450,460 and 470℃for 1 h,respectively,and solution treated at 470℃for 0.5,1 and 2 h,respectively,and aged at 120℃for 18 h were investigated by means of hardness,electrical conductivity,tensile test and microstructure analysis.The results show that when the solution treatment temperature is between 450-470℃and the solution treatment time is 1 h,with the increase of solution treatment temperature,the soluble second phase particles in the aged state alloy gradually dissolve,the strength,elongation and hardness increase,and the electrical conductivity decreases.When the solution treatment temperature is 470℃and the solution treatment time is between 0.5-2 h,with the extension of solution treatment time,the dissolution degree of soluble second phase particles in the aged state alloy increases,reaching a supersaturated state after 1 h.If the solution treatment time is further extended,the number of second phase particles does not change significantly,the strength increases first and then decreases,the elongation and hardness continuously increase,and the electrical conductivity first decreases and then increases.Under the condition of solution treatment at 470℃for 1 h and aging at 120℃for 18 h,the mechanical properties of the alloy can reach a tensile strength of 645.3 MPa,a yield strength of 585.0 MPa,a hardness of 182.53 HV3,and an electrical conductivity of 27.59%IACS.

关 键 词：7C04铝合金 固溶处理 力学性能 电导率 

分 类 号：TG166.3[金属学及工艺—热处理]