固溶温度对6181A铝合金板材显微组织和性能的影响  

Effect of Solution Treatment Temperature on Microstructure and Properties of 6181A Aluminum Alloy

作　　者：张放[1,2] 刘艳芬 李继林 李永杰 王孟君[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广东省材料与加工研究所,广东广州510651 [3]云南商务信息工程学校,云南昆明650000 [4]广州铱尹新材料科技有限公司,广东广州510650

出　　处：《铸造技术》2017年第5期1042-1046,共5页Foundry Technology

基　　金：广东省产学研项目(2016B090931004;2015B090926007;2015B090926013;2014B090903012;2014B0707060 7;2014B030301012;2014B090907008;2013A090100002;2013B091602002;2013B090200008)资助

摘　　要：采用光学显微镜、扫描电镜、单向拉伸、硬度等分析检测手段,研究固溶温度(490~590℃)对6181A铝合金轧制板材的显微组织、力学性能以及腐蚀性能的影响规律。结果表明:合金的强度随固溶温度升高呈先升高后下降的趋势,550℃时达到最高值。在此条件下,合金的抗拉强度和屈服强度分别为373 MPa和335 MPa。固溶处理后残余的可溶第二相粒子和再结晶程度是影响拉伸断口形貌的主要因素。温度小于530℃时,合金的断裂为包含第二相粒子的韧窝型断裂。温度大于530℃时,合金的断裂为晶内韧性断裂与沿晶断裂的混合型断裂。晶间腐蚀的最大深度随固溶温度升高呈现先增加后降低的趋势。固溶温度影响晶界第二相析出状态及晶粒的大小,进而影响腐蚀速率和腐蚀扩展路径,两种因素共同决定合金最大腐蚀深度。The effect of solution heat treatment temperature on the mechanical properties and intergranular corrosion of the rolled sheets of 6181 A aluminum alloy was investigated and the mechanism was discussed based on the optical microscopy, scanning electron microscopy, tensile test, hardness test. The results show that the strength and hardness enhance with the increase of solution temperature in the range of 490~550 ℃, then decreases. Under the condition of solution treatment at 550 ℃ for 40 min, quenched and then aged at 180 ℃ for 3 h, the tensile strength, yield strength of the alloy reach 373 MPa, 335 MPa, respectively. The fracture morphology is mainly affected by the volume fraction of residual particles and the recrystallization. Solution heat treatment temperature has a great effect on the recrystallization and the particles at grain boundaries, therefore, changes the penetration path of intergranular corrosion and the corrosion rate.Then, the two factors determine the maximum penetration depth.

关 键 词：6181A铝合金 固溶处理 力学性能 拉伸断口 晶间腐蚀 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]