摘要
对厚为2mm的镁合金AZ31B和铝合金6061-T6板材搭接面涂敷Zn粉诱导搅拌摩擦搭接连接.采用光学显微镜(OM)、扫描电子显微镜(FEG-450)、能谱仪(EDS)研究了焊接速度为50mm/min,不同转速600~1 400r/min下接头的组织,并用显微维氏数值硬度仪和剪切试验对接头的力学性能进行了表征,同时用XRD对剪切断口进行了分析.结果表明:Zn粉的加入可有效阻止镁铝之间的互扩散,降低脆性相Al-Mg系金属间化合物的产生,提高了镁/铝搭接接头的抗剪切载荷,改善了接头的力学性能.
Zn powder was coaded on the lapping surface of 2 mm thick AZ31B Mg and 6061 T6 Al allo ying plates to assist their friction stir lop welding. The microstruture of their joint was investigated under welding speed of 50 mm/rain and rotation speed from 600 r/min to 1 400 r/min with optical microscope （OM）, scanning electron microscope （SEM） FEG 450 and energy dispersion spectroscope（EDS）, the me chanical properties of the joint were characterized by means of microscopic Vickers numeric hardness and shear test, and the shearing fracture was analyzed with XRD. The result showed that the addition of Zn powder could effectively prevent the mutual diffusion between Mg and Al, reduce the formation of brittle A1 Mg intermetallic compounds, enhance the shearing strength of the joint, and improve its mechanical proper ties.
作者
金玉花
吴永武
毕胜
王希靖
郭廷彪
dIN Yu-hua;WU Yong-wu;Bi-Sheng;WANG Xi-jing;GUO Ting-biao(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2018年第4期26-31,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51261016)
关键词
镁合金
铝合金
锌粉涂层
搅拌摩擦焊
组织
接头力学性能
Mg alloy
Al alloy
zinc powder coating
friction stir welding
organization
mechanicalproperty
