5052铝合金FSW接头拉伸力学性能影响机制  

Influence Mechanism of Tensile Mechanical Properties of 5052 Aluminium Alloy FSW Joint

作　　者：王引卫[1] 王鹏飞[1] 李春风[2] 

机构地区：[1]西京学院机械工程学院,陕西西安710123 [2]承德石油高等专科学校工业中心,河北承德067000

出　　处：《热加工工艺》2016年第11期212-214,217,共4页Hot Working Technology

基　　金：陕西省教育厅专项科研计划项目(15JK2172)

摘　　要：利用搅拌摩擦焊对5052-H34铝合金进行焊接,采用光学显微镜和透射电镜分析了焊接接头处的显微组织和位错,利用静态拉伸测试焊接试样的力学性能。研究发现:接头搅拌区显示为等轴细小晶粒,其位错密度低于母材;与母材相比,平行于焊缝的拉伸试样的最大拉伸应力降低了15 MPa,伸长率却提高了12%,垂直于焊缝的拉伸试样的最大拉伸应力比母材小25 MPa,但伸长率提高不明显。The 5052-H34 aluminium alloy was welded by means of friction stir welding（FSW）. Microstructure and dislocation of the FSW joint were investigated based on optical microscope and transmission electron microscopy respectively.The static tensile mechanical properties of the tensile specimens, perpendicular and parallel to the welds were investigated.Researches show that the dislocation density of the stirred zone which is filled with equiaxed fine grains is lower than that of base metal. Compared with base metal, the maximum tensile stress of the specimens parallel to the weld decreases by 15 MPa,but the elongation increases by 12 %; the maximum tensile stress of the specimens perpendicular to the weld decreases by 25 MPa,which is lower than that of base metal, but the elongation is unconspicuously increased.

关 键 词：搅拌摩擦焊 显微组织 位错密度 伸长率 

分 类 号：TG453.9[金属学及工艺—焊接] TG407