Technische Universität Chemnitz
The stiffness and strength of common aluminum alloys can be achieved by finely dispersed particle reinforcement, which is particularly effective via high-energy ball milling (HEBM) of aluminum alloy powder with ceramic particles. These aluminum matrix composites (AMC) are expensive in production and are often only found in particular applications. One approach to reduce the costs is to use low-cost starting materials for the matrix material. Within the scope of the work, aluminum grit from foil chips, together with SiC reinforcement particles, are investigated for the HEBM process of AMC. The resulting composite powders are then formed directly into rods by extrusion. We have investigated the milling process utilizing a design of experiments. The influences of milling time, atmosphere, and rotor speed are shown for an alloy's ten percent by volume-reinforced Al-grit from the 8xxxx series. In addition to determining the mechanical properties of the obtained extrusion rods and the hardness values, the development is accompanied by microstructure investigations. The results of recyclate-based AMC are placed in the context of existing results.
Abstract
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