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Production of Ultra Fine Grained Aluminum Alloy using Friction Stir Process*

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Figure

Fig. 1Schematic illustration of the basic principle of the friction stirprocess (FSP) in the present research
Fig. 3Morphology and dimensions of the tensile test specimen.
Figure 7 shows the TEM micrographs of (a) the UZ (as
Fig. 7Transmission electron micrographs of (a) the unprocessed zone (as cold-rolled 1050 aluminum alloy) and the central regions withinthe friction stir processed zone of the specimens produced at the tool rotation speeds of (b) 560, (c) 980 and (d) 1840 min�1.
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