Abstract
The publication describes the approaches and results of the investigation of arc brazing processes to produce dissimilar joints of particle reinforced aluminium matrix composites (AMC) to aluminium alloys and steels. Arc brazing allows for low thermal energy input to the joint parts, and is hence suitable to be applied to AMC. In addition, a braze filler B-Al40Ag40Cu20 alloyed with Si with a liquidus temperature of below 500 °C is selected to further reduce the thermal energy input during joining. The microstructures of the joining zones were analysed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and X-ray diffraction analysis (XRD), as well as their hardness profile characterised and discussed. Joint strengths were measured by tensile shear tests, and resulting areas of fracture were discussed in accordance to the joints’ microstructures and gained bond strength values.
Highlights
Dissimilar metal joints under presence of light metals show a high potential to further improve existing light weight solutions, since they strongly widen the design flexibility of components and assemblies
B-Al40Ag40Cu20 braze filler shows very good wetting when arc brazed on aluminium matrix composites (AMC), with wetting angles of less than 20◦
Joints of particle reinforced aluminium matrix composites to itself, stainless steel, and aluminium alloy were successfully produced by arc brazing
Summary
Dissimilar metal joints under presence of light metals show a high potential to further improve existing light weight solutions, since they strongly widen the design flexibility of components and assemblies. To this design flexibility, high performance materials, like aluminium matrix composites (AMC), add further advantages regarding the mechanical and physical properties, like a lower coefficient of thermal expansion, higher specific strength, or an increased wear resistance in comparison to non-reinforced aluminium [1,2,3]. The level and time of the heat input influence metallurgic
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