预时效处理对6111铝合金力学性能及析出行为的影响  

Effect of pre-aging treatment on mechanical properties and precipitation behavior of 6111 aluminum alloy

作　　者：高岩[1] 魏茂源[1,2] 滕敦波 Gao Yan;Wei Maoyuan;Teng Dunbo(Institute of Science and Technology,Yantai Nanshan University,Yantai Shandong 265700,China;National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co.,Ltd.,Yantai Shandong 265713,China)

机构地区：[1]烟台南山学院科学技术研究院,山东烟台265700 [2]山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心,山东烟台265713

出　　处：《金属热处理》2019年第11期85-89,共5页Heat Treatment of Metals

基　　金：山东省高校科技计划(J18KA028)

摘　　要：采用连续退火模拟机研究了预时效处理对汽车用6111铝合金力学性能及强化相析出动力学的影响,运用差示扫描量热法(DSC)和透射电镜(TEM)表征了微观组织的变化,测试了力学性能,运用Avrami方程计算了β″相的析出动力学。结果表明:经180、190、200℃双级预时效处理后的试样,人工时效过程的屈服强度硬化增量显著高于单级预时效处理,分别提高了50%、60%和64%,且均达到了100 MPa以上;伸长率均低于单级预时效处理,分别降低了1%、3%和6%。双级预时效处理后GP区数量增加,人工时效过程形成尺寸更为细小弥散的β″亚稳强化相,密度更高。双级预时效处理后,β″相析出激活能降低,且180℃双级处理后β″相析出激活能最低,仅为62.22 kJ/mol。Influence of pre-aging treatment on the mechanical properties and precipitation kinetics of 6111 aluminum for automobile was carried out using continuous annealing simulator,and the microstructure evolution was characterized using DSC and TEM.The mechanical properties were tested and the precipitation kinetics of theβ″phase was calculated using the Avrami equation.The results indicate that the increments of yield strength during artificial aging treatment after two-stage pre-aging treatment at 180℃,190℃and 200℃are higher than that in the one-stage pre-aging treatment,which are increased by 50%,60%and 64%respectively,and all reached more than 100 MPa;the elongation is lower than that of single stage pre-aging treatment,i.e.,reduced by 1%,3%and 6%respectively.After twostage pre-aging treatment,the fraction of GP zone increases,and theβ″metastable strengthening phase is finer and more dispersed.Theβ″phase precipitation activation energy decreases after two-stage pre-aging treatment and achieves the lowest value at 180℃,which is only 62.22 kJ/mol.

关 键 词：6111铝合金 双级预时效处理 析出动力学 微观组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]