Multiscale Microstructure Characterisation of Metal Matrix Composites (MMC) Reinforced by the Ultrafine Particles

This work deals with the explanation, through multiscale microstructural investigations, of the strengthening mechanism in Al/TiC in-situ cast composites. The strengthening effects related to the number and size of TiC particles, grain refinement of the matrix, and the lattice mismatch between the Al and TiC crystal lattices were explained based on two composites containing 5 and 15 wt.% TiC, respectively. The microstructural investigations were supported by tensile test, hardness, and abrasive wear resistance measurements. It has been shown that the addition of 15 wt.% of TiC particles to the aluminium matrix is more beneficial for mechanical properties and wear resistance than 5 wt.%, despite the intensified clustering process of TiC particles.