Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Friction Stir Processing as a fabricating route of dispersion strengthened aluminum alloys

nr katalogowy: 79719

Pure aluminum belongs to the class of soft metals, so its application in engineering is highly limited. For this reason, aluminum has to be strengthened to meet technical requirements. Dislocation hardening by plastic deformation or alloying followed by appropriate heat treatment producing precipitation hardening are the most common strengthening mechanisms of aluminum. Precipitation strengthening substantially increases the hardness and tensile strength at room temperature. However, the precipitates are prone to coarsening at elevated temperatures resulting in deterioration of mechanical properties. The incorporation of fine dispersed particles into their microstructure is the other common method of strengthening metallic alloys. Such alloys are usually produced by powder metallurgy methods, e.g. sintering of aluminum powders [1] or mechanical alloying [2]. It was recently discovered that the friction-stir processing (FSP) method may be also adapted for this purpose. FSP uses the same methodology as friction stir welding (FSW); however, FSP is used to modify the local microstructure, but it does not join metals together [3]. A schematic illustration of FSP is shown in Figure 1. During FSP, the area to be processed and the tool are moved relatively to each other in such a way that the tool traverses, with overlapping passes, until the entire selected area is processed. The rotating tool provides a continual hot working action, plasticizing metal within a narrow zone while transporting metal from the leading face of the pin to its trailing edge. The processed zone cools, without solidification, as there is no liquid, forming the defect-free recrystallized and fine grain microstructure. Essentially, FSP is a thermomechanical metal working process that changes the local properties without influencing properties in the remainder of the structure. FSP can also produce fine-grained micro[...]

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