摘要
针对2 mm厚的2A16防锈铝合金和2 mm厚的T2紫铜,采用对接的方式进行了真空电子束扫描焊接。通过拉伸试验仪、维氏硬度测试仪和扫描电镜对接头的力学性能和断口形貌进行了测试和分析,采用XRD分析了接头化合物。研究结果表明:接头抗拉强度随着电子束流、扫描幅值的增大呈先增大后减小的趋势,当焊接速度为1800mm/min、电子束流为62 m A、扫描幅值为0.8 mm时抗拉强度达到最大值71.2 MPa。接头的断裂方式为韧脆混合型断裂,在最佳工艺参数下以韧性断裂为主。硬度的分布与接头的形貌有关,铝-铜界面连接区的硬度最大,铝侧和铜侧熔化区的硬度都分别要比铝母材和铜母材的硬度高。XRD分析其接头化合物为Al_2Cu。
2A16 aluminum alloy with 2.0 mm thickness and T2 copper with 2.0 mm thickness were welded by vacuum electron beam welding. The mechanical properties and fracture morphology of the joint were studied by using tensile tester, vickers hardness tester and scanning electron microscope, and the compound of the joint was analyzed by XRD. The results show that： Tensile strength of the joint increases firstly and then decreases with the increase of electron beam current and scanning magnitude. When the welding speed is 1800 mm/min, electron beam current is 62 mA, and scanning magnitude is 0.8 mm, the tensile strength reaches the maximum of 71.2 MPa. The fracture of joint includes ductile fracture, and brittle fracture. The fracture of the joint is main ductile fracture under optimum parameters. The microhardness distribution of the joint is related to the joint morphology. The maximum microhardness of the joint appears aluminum-copper interface connection region. The microhardness of the melting zone of aluminum side and copper side is higher than that of the aluminum base metal and copper base metal respectively. The compound of joint is Al2Cu analyzed by XRD.
出处
《热加工工艺》
CSCD
北大核心
2016年第15期65-67,71,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51465042)
关键词
铝合金
紫铜
电子扫描焊接
力学性能
aluminum alloy
copper
electron beam scanning welding
mechanical property
