Dry sliding wear behaviour of in situ Al-TiB_2 composites

摘要

Aluminium matrix/titanium diboride reinforced (Al/TiB_2) composites were fabricated by in situ process. The wear behaviour was studied by using a pin-on-disc wear tester at room temperature. The coefficient of friction and wear rate were calculated experimentally for the Metal Matrix Composites (MMC) prepared from the Al/TiB_2 system. The wear properties of MMC has improved significantly as a result of formation of fine TiB_2 particles which are more uniformly dispersed in the aluminium matrix. Furthermore, strong particle/matrix bonding in Al/TiB_2 composites enables the in situ particles to be retained in the wear surface during sliding, thereby effectively resisting the shear deformation. The worn surface were analysed using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive Spectroscopy (EDS). This paper presents the relationship between various dominant mechanisms of wear that are observed to occur under different conditions as well as the anticipated rates of wear.