退火对Al-Mg搅拌摩擦焊接头组织及力学性能的影响  

Influence of post-weld annealing treatment on microstructures and mechanical properties of dissimilar Al-Mg friction stir welded joint

作　　者：邓清洪 李志明 蒋习均 周长兴 付瑞东[2] DENG Qinghong;LI Zhiming;JIANG Xijun;ZHOU Changxing;FU Ruidong(Hunan Joinfront Welding Technology Co.,Ltd.,Zhuzhou 412000,China;State Key Laboratory of MetastableMaterials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]湖南九方焊接技术有限公司,湖南株洲412000 [2]燕山大学亚稳材料制备技术与科学国家重点试验室,河北秦皇岛066004

出　　处：《电焊机》2018年第10期36-43,共8页Electric Welding Machine

摘　　要：采用搅拌摩擦焊对3 mm厚的工业纯铝和AZ31镁合金异种金属进行焊接,研究焊后退火对AlMg异种金属FSW接头组织及力学性能的影响,并进行了OM观察、EDS分析、界面金属间化合物形变能力测试、接头拉伸性能测试和断口表面SEM分析。结果表明,界面IMCs层经退火后有明显长大,且界面IMCs层无法协同两侧基体金属变形,几乎无变形能力;Al-Mg异种金属焊态接头的抗拉强度为106 MPa,为母材纯铝的92%,断后延伸率为3.2%,为母材纯铝的91%;在300℃,退火时间分别为20 min、40 min、60 min的条件下,接头随着退火时间的增加IMCs层明显长大,抗拉强度和断裂延伸率均呈急剧下降的趋势,依次为94 MPa/1.3%、70 MPa/0.7%和28 MPa/0.4%,接头断裂模式由韧性断裂转变为脆性断裂。The 3 mm thickness industrial pure aluminum and AZ31 magnesium alloy dissimilar metals joints were successfully manuf-actured by friction stir welding（FSW） . The influence of post-weld annealing treatment on microstructures and mechanical propertiesof dissimilar Al-Mg friction stir welded joint were investigated in detail. Using OM, EDS, IMCs deformability testing, tensile propertiestesting and SEM for fracture surface analysis. The results showed that the interface IMCs have obvious growth after annealingtreatment. The interface IMCs layer cannot cooperate deformation with the both sides of the matrix metal, almost no deformationability; the tensile strength of the as-welded FSW Al-Mg dissimilar joints was 106 MPa, 92% of the base metal（BM）of aluminum.Meanwhile, the elongation was 3.2%, 91% of BM of Al. The tensile strength and elongation of the Al-Mg joints decreased with theIMC grown up during the process of thermal of 300 ℃ with the holding time of 20 min, 40 min and 60 min, which were 94 MPa/1.3%,70 MPa/0.7% and 28 MPa/0.4%, respectively. Accordingly, the fracture mode changed from ductile fracture to brittle fracture.

关 键 词：搅拌摩擦焊 焊后退火 AL-MG 抗拉强度 金属间化合物 

分 类 号：TG453.9[金属学及工艺—焊接]