Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy

Abstract

Abstract. Requirements of multi-material construction involve adjustments to standard joining techniques. Especially the growing importance of integral cast components poses additional engineering challenges for the industry. One approach to achieve these goals are adaptable joining elements formed by friction spinning. This approach uses friction-induced heat to form customisable joining elements to join sheets for different boundary conditions, even for brittle cast materials. It is possible to react immediately to adapt to the joining process inline and reduce the amount of different joining elements. As the joining partner serve casting plates of the aluminium casting alloy EN AC–AlSi9, which is processed in the sand casting. Joining hypoeutectic AlSi alloys constitutes a challenge because the brittle character of these cause cracks in the joint during conventional mechanical joining. Furthermore, the friction-induced heat of the novel joining process causes a finer microstructure in the hypoeutectic AlSi9 casting alloy. In particular, the eutectic Si is more fine-grained, resulting in higher joint ductility. This study indicates the joining suitability of a hypoeutectic aluminium casting alloy in combination with adaptive manufactured additional joining elements. Here, various mechanical and microstructural investigations validate the influence of the thermomechanical joining technique. In conclusion, the potential of this joining process is presented regarding the joinability of cast aluminium components.

Characteristics of 2D Ultrasonic Vibration Incremental Forming of a 1060 Aluminum Alloy Sheet

“…Plastic processing technology, like punching, wire drawing, extrusion, or rolling, is one of the most frequently used method for the manufacturing of metal products. The most common products include but are not limited to the following items: capacitors, gaskets, isolation nets of vacuum tubes, protective covers for electrical cables, components of ventilation systems of aircrafts, heat-conducting elements, radiators, hull parts of ships, metal handicrafts, doors, and window decorations [ 2 , 3 ]. Obviously, there are huge market requirements for thin-walled components of 1060 aluminum alloy and their manufacturing technology.…”