对薄壁铝合金/铝基SiC复合材料搭接接头微搅拌摩擦焊接(μ-FSW)工艺特性、接头形貌特征及力学性能进行研究,并揭示搭接界面形成机制及接头失效机制.结果表明:在较宽的工艺参数窗口内均可得到成形良好的焊缝.由于μ-FSW所特有的金属流动特点,以及SiC颗粒难以流动的特性,搭接界面呈现出一种特殊的“弯钩状”形貌.接头的断裂为界面迁移处“减薄”区域的拉伸断裂.接头力学性能与载荷方向直接相关,这是由不同的金属塑性流动行为所致.
The micro friction stir welding (μ-FSW) of lap joints of thin Al-alloy plate with a thickness of 0.5 mm and SiC reinforced Al composite were investigated,concentrating on the process characteristics,macro-morphology of weld cross-section and mechanical properties of the joints.The mechanisms of migration interface morphology formation and joint failure were revealed.The results show that with suitable indentation depth,welds of good appearance can be obtained in a wide range of process window.The weld cross-section shows special "hoop shape" migration interface morphology,caused by the characteristics of μ-FSW process and SiC particles.The joint failure mode is tensile fracture of "thinning area" at the upper rim of migration interface.And the joint mechanical properties are directly related to the loading direction,which is caused by different metal plastic flow behaviors.
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