Abstract
In this paper, dissimilar metal joints of 6061 aluminum alloy and aluminum matrix composite material are investigated by laser welding. TiB2 particles were added into the lap joint. The welding process, microstructure, and the corrosion properties of welding joints are examined. The results demonstrate that the selected optimization process parameters are laser power 6 kW, welding speed 0.6 mm/s, pulse width 11.5 ms, and laser frequency 4.5 Hz. There are a few obvious pores in the molten pool. Al2Ti, Fe2Si, and Al0.5Fe3Si0.5 are present in the microstructure. During the welding process, some TiB2 particles are decomposed and reacted with molten Al. Other TiB2 particles are nucleated and solidified, and the excess TiB2 particles are pushed to the grain boundaries by molten Al. TiB2 particles are wetted well by molten matrix metal. The corrosion resistance of alloys in different conditions decreased in the following order: the weld beam >6061 Al > AMC.
Highlights
Aluminum alloys and aluminum matrix composites (AMCs) are two highly important lightweight metals currently used in many fields such as automotive, electronics, and aerospace industries because of their good formability and lightweight
According to the research of constantly high-power laser welding of TiB2-reinforced AMC [10], it is found that TiB2 particles have a great influence on the flowability of molten pool and there is a certain trend in the interface reaction between TiB2 particles and matrix metal
After the immersion of the electrode into the corrosive solution, the working electrode was abandoned at open circuit potential for more than 10 min in order to stabilize the corrosion potential. e polarization started from a cathodic potential of −250 mV relative to the open circuit potential and stopped at an anodic potential where the anodic current increased significantly. e scanning rate was 1 mV/s. 6061 Al, and AMC base metal are tested as contrast
Summary
Aluminum alloys and aluminum matrix composites (AMCs) are two highly important lightweight metals currently used in many fields such as automotive, electronics, and aerospace industries because of their good formability and lightweight. According to the research of constantly high-power laser welding of TiB2-reinforced AMC [10], it is found that TiB2 particles have a great influence on the flowability of molten pool and there is a certain trend in the interface reaction between TiB2 particles and matrix metal. There are some friction welding processes of dissimilar Al/AMC alloys [12, 13]. Research on Al/AMC laser-welded joints and the corrosion properties of welding joints is little. Is study is intended to investigate Nd-YAG laser welding of dissimilar Al/AMC joints with TiB2 particles. E microstructure and the corrosion properties of laserwelded Al/AMC joints were discussed
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