Study the effects of TiB2 reinforcement on the AA-2014 matrix fabricated by friction stir processing

This study explores the impact of TiB₂ nanoparticles on the microstructure, microhardness, and tensile properties of AA-2014 surface composite manufactured through Friction Stir Processing (FSP). A series of experiments were conducted with varying FSP parameters, and the findings were compared with the base metal. Microstructure studies revealed optimal bonding between TiB₂ and the AA-2014 substrate at 1200 rpm, surpassing results from 900 and 1600 rpm. However, microstructural analysis unveiled agglomeration of particles and void formation on the composite surface. Microhardness values indicated a substantial increase from 88 HV (AA-2014) to 138 HV (AA-2014/3%TiB₂ @1200rpm), attributed to the presence of TiB₂ nanoparticles and FSP-induced modifications. Ultimate Tensile Strength (UTS) values exhibited a noteworthy improvement from 290 MPa (AA-2014) to 465 MPa (AA-2014/3%TiB₂ @1200rpm), emphasizing the positive influence of uniform TiB₂ dispersion achieved during FSP. The study underscores the effectiveness of TiB₂ reinforcement and FSP in enhancing the mechanical properties of AA-2014 surface composite, despite observed microstructural features.