6533b834fe1ef96bd129cdc3

RESEARCH PRODUCT

Enhancement of mechanical properties of FSWed AA7075 lap joints through in-situ fabrication of MMC

Davide CampanellaGianluca BuffaLivan Fratini

subject

0209 industrial biotechnologyFriction stir processingMaterials scienceStrategy and ManagementFriction Stir WeldingLap joint02 engineering and technologyWeldingManagement Science and Operations ResearchIndentation hardnessIndustrial and Manufacturing EngineeringAA7075law.invention020901 industrial engineering & automationlawFriction stir weldingComposite materialSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneGroove (music)Metallurgy021001 nanoscience & nanotechnologyGrain sizeStrategy and Management1409 Tourism Leisure and Hospitality ManagementShear (sheet metal)Lap jointMetal Matrix Composite0210 nano-technology

description

Abstract Friction Stir Processing (FSP) has been demonstrated feasible to create local Metal Matrix Composites (MMCs) in light alloys matrix. In this research, local MMCs were produced contextually to the weld using Friction Stir Welding (FSW). SiC particles were added to AA7075 lap joints by creating a proper groove on the top surface of the bottom sheet. Different welds were produced with increasing number of tool passes. The effect of the multiple passes was investigated through shear tests, macro and micro observations, average grain size and microhardness measurements. The welded joints were compared to a reference weld produced with no reinforcements. It was found that poor mixing between matrix and reinforcement phase is obtained with one tool pass. On the contrary, proper mixing is obtained with three tool passes, resulting in an increase in the maximum load in shear tests of 50% with respect to the reference conditions.

yearjournalcountryeditionlanguage
2017-08-01Journal of Manufacturing Processes
https://doi.org/10.1016/j.jmapro.2017.04.008