Unraveling the mechanical behavior of AA 7075 - WC nanocomposites developed through FSP route 2020-28-0404
Friction Stir Processing (FSP) is a solid-state processing approach that alters and enhances the properties of the matrix material. The prime objective of this research work was zinc-based 7075-T6 Aluminium Alloy (AA) with reinforced by varying 0, 2.5, 5 and 10 wt.% Tungsten carbide (WC) nanoparticles by FSP route. During experimentation, the FSP processing parameters like tool speed, traverse speed, axial load, and tool were being kept constant with three passes of processing. The test samples were prepared and tested as per standard procedures like hardness, impact strength, ultimate tensile strength, and average values were recorded. Also, fracture surface morphology was studied. Among all the combinations of test samples at a 10 wt% addition of WC nanoparticles of FSP AA7075-T6 sample exhibited a higher value of 53 HV microhardness and 5.1 impact strength and 150 MPa in the UTS were obtained. This was due to the presence of more wt% WC nanoparticles place a major role in the FSP zone. The microhardness and tensile strength increased due to the three passes resulting in a decrease of the grains in the stir zone as the dislocations become more difficult and WC particles restrict the movement of grain boundaries. The tensile tested samples fracture surface morphology of the revealed deep dimples representing a good ductility. Thus, the processed metal matrix composites were suitable for higher-end applications like marine, automobile, and military.