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对3 mm厚的AZ31-O镁合金板和6061-T6铝合金板进行异种材料搅拌摩擦焊。实验中搅拌针的旋转速度为600~1400 r/min,前进速度为20~60 mm/min。结果表明,在旋转速度1000 r/min、前进速度40 mm/min的工艺条件下,可以获得无缺陷的焊接接头。组织观察发现搅拌区的晶粒尺寸要比基材区的明显小很多。在搅拌区形成了复杂的金属流动。显微硬度测试表明搅拌区的硬度分别是不均匀的。拉伸实验结果表明,接头的拉伸强度约为基材AZ31镁合金的76%,或6061铝合金的60%。接头拉伸断口SEM形貌观察表明为脆性断裂。
A 3 mm thick AZ31-O magnesium alloy plate and a 6061-T6 aluminum alloy plate were friction stir welded. In the experiment, the rotating speed of the stirring pin is 600 ~ 1400 r / min and the advancing speed is 20 ~ 60 mm / min. The results show that under the conditions of 1000 r / min of rotation speed and 40 mm / min of advance speed, the weld joint without defects can be obtained. Tissue observations revealed that the grain size of the agitation zone was significantly smaller than the substrate area. In the mixing zone formed a complex metal flow. Microhardness tests show that the hardness of the mixing zone is uneven. Tensile test results show that the joint tensile strength of about 76% of the substrate AZ31 magnesium alloy, or 60% of 6061 aluminum alloy. Tensile fracture SEM SEM observation showed brittle fracture.