Abstract
Notwithstanding the extensive interest in using friction stir processing (FSP) for producing metal matrix composite (MMC), more uniform powder distribution along the composite zone is still needed. In most studies, one groove is machined out of the specimen, filled with powder, and then processed by identical passes. In this investigation, an innovative technique was used that involved machining out of three gradient grooves with increasing depth from the advancing side to the retreating side instead of using a conventional sample with just a groove. Macro, optical, and scanning electron microscopy (SEM) images and microhardness test were used to evaluate the powder distribution. The images indicated that the most uniform distribution of SiC particles in the whole composite zone was related to a three-gradient grooves sample. Microohardness measurement of a three-gradient grooves sample, carried out along the cross section and perpendicular to the traverse direction of FSP, experiences less fluctuation in hardness compared with other techniques.
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Heydarian, A., Dehghani, K. & Slamkish, T. Optimizing Powder Distribution in Production of Surface Nano-Composite via Friction Stir Processing. Metall Mater Trans B 45, 821–826 (2014). https://doi.org/10.1007/s11663-014-0025-z
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DOI: https://doi.org/10.1007/s11663-014-0025-z