摘要
采用光学显微镜、透射电子显微镜、维氏硬度计和拉伸试验机,研究了Al-6.6Zn-1.7Mg-0.26Cu合金挤压材熔化极惰性气体保护焊接接头的显微组织和力学性能。结果表明:焊缝中心区为枝晶,靠近母材侧的焊缝熔合区为柱状晶,母材为等轴晶,但靠近焊缝熔合区的母材晶粒发生了长大。焊接接头的硬度以焊缝为中心呈对称分布,从母材到焊缝中心,硬度先下降后上升再下降。焊缝中心区的硬度最低,为86~105(HV)。焊接接头的抗拉强度为309MPa,屈服强度为237MPa,伸长率为4.75%,挤压材的焊接强度系数为0.76。
The microstructure and mechanical property of metal inert gas protected welding joint in as-extruded Al-6.6 Zn-1.7 Mg-0.26 Cu alloy were studied by optical microscope,transmission electron microscope,vickers hardness tester and tensile testing machine.The results show that the microstructure of center area of weld seam is dendrite.The microstructure of weld fusion zone near matrix is columnar crystal.The microstructure of matrix is equiaxed grain.However,the grains of matrix near weld fusion zone have grown up.The hardness of weld joint is symmetrically distributed by taking weld seam as the center.From matrix to the center of weld seam,the hardness is decreased,increased and decreased in turn.The center area of the weld joint shows the lowest hardness of 86-105（HV）.The tensile strength,yield strength and elongation of weld joint are 309 MPa,237 MPa and 4.75%,respectively.The welding strength coefficient of as-extruded Al-6.6 Zn-1.7 Mg-0.26 Cu alloy is 0.76.
作者
张会
刘磊
周楠
罗明强
胡权
ZHANG Hui;LIU Lei;ZHOU Nan;LUO Mingqiang;HU Quan(Guangdong Institute of Materials and Processing,Guangzhou 510651,China;Guangdong Xingfa Aluminium Co.,Ltd.,Foshan 528000,China;Foshan Sanshui Fenglu Aluminum Co.,Ltd.,Foshan 528133,China)
出处
《有色金属材料与工程》
CAS
2018年第4期16-20,共5页
Nonferrous Metal Materials and Engineering
基金
广东省科技计划项目(2016B090931001
2014B090903005)
佛山市科技计划项目(2016AG101761
2013AH100055)
