摘要
Material flow and phase transformation were studied at the interface of dissimilar joint between Al 6013 and Mg, produced by stir friction welding （FSW） experiments. Defect-free weld was obtained when aluminum and magnesium were placed in the advancing side and retreating side respectively and the tool was placed 1 mm off the weld centerline into the aluminum side. In order to understand the material flow during FSW, steel shots were implanted as indexes into the welding path. After welding, using X-ray images, secondary positions of the steel shots were evaluated. It was revealed that steel shots implanted in advancing side were penetrated from the advancing side into the retreating side, whereas the shots implanted in the retreating side remained in the retreating side, without penetrating into the advancing side. The welded specimens were also heat treated. The effects of heat treatment on the mechanical properties of the welds and the formation of new intermetallic layers were investigated. Two intermetallic compounds, Al3Mg2 and Al12Mg17, were formed sequentially at Al6013/Mg interface.
研究搅拌摩擦焊接铝合金6013和纯镁板在接头界面处的材料流动及相变。将铝合金6013和纯镁板分别放置在焊缝的前进侧和返回侧,搅拌针放在焊缝中央偏向铝合金侧1mm处,可以获得无缺陷的焊缝。为了研究搅拌摩擦焊时材料流动情况,将钢丸嵌入焊接材料中作为示踪材料,焊接完成后,采用X射线分析钢丸在材料中的位置。结果表明,嵌在前进侧材料中的钢丸焊后进入了返回侧材料中,而嵌在返回侧材料中的钢丸仍留在返回侧中。对焊接试样进行热处理,研究热处理对焊接接头力学性能的影响和接头处金属间化合物层的生成情况。结果表明,在接头界面处生成了2种金属间化合物:Al3Mg2和Al12Mg17。
