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        Precipitation Hardening and Corrosion Behavior of Friction Stir Welded A6005-TiB2 Nanocomposite

        N. Abu‑warda,M. D. López,B. González,E. Otero,M. D. Escalera‑Rodríguez,S. Cruz,P. Rey 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

        Precipitation hardening and corrosion behavior of a friction stir welding (FSW) based on the aluminum alloy A6005 reinforcedwith TiB2nanoparticles have been studied. Mechanical alloying (MA) and hot extrusion techniques have beenemployed as processing route followed by FSW. Samples characterization has been performed by DSC and TEM, and precipitationstrengthening of the bulk samples and the FSW joint has been evaluated by micro-hardness tests after T6 thermaltreatment. TEM characterization revealed the presence of Mg–Si hardening phases, mainly of β′ phase, and dispersoids ofα-Al(FeMnCr)Si into the aluminum matrix. The results revealed that samples subjected to MA had less susceptibility toT6 thermal treatment and that the presence of nano-TiB2 reinforcement accelerates aging time. In addition, electrochemicaltests based on polarization tests have been performed in 3.5% NaCl solution to assess the effect of FSW process on corrosionbehavior. The FSW joint had worse corrosion behavior since the passive Al2O3film was not generated on the weldzone. SEM–EDS analysis revealed that pits nucleated mainly in sites with a higher presence of Fe contaminant which actscathodically with respect to the aluminum matrix, producing galvanic corrosion.

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