Characterization Investigations of 2 wt% LaB 6 Particulate-Reinforced Al-7 wt% Si Matrix Composites Fabricated by Powder Metallurgy Methods

摘要: In this study, first of all, sub-micron LaB6 reinforcing particles were synthesized in the size range 100–500 nm via mechanochemical synthesis and leaching steps. Afterwards, Al-7 wt% Si matrix alloy 2 wt% laboratory powders mechanically alloyed (MA’d) at different durations to constitute Si/2 wt% LaB6. Followed by compaction under a pressure 450 MPa uniaxial cold press, samples sintered 570 °C for 2 h flowing Ar gas atmosphere. Microstructural characterizations performed using X-Ray Diffractometry (XRD) Scanning Electron Microscopy (SEM) techniques. Effects both MA (0, 1, 4 8 h) reinforcement (0 2 wt%) on mechanical properties composites determined terms microhardness dry sliding tests. Both process found make positive contribution hardness wear resistance values. As-blended had value 0.43 GPa. On other hand, 8 h MA’d composite highest (0.97 GPa) 4 h one lowest rate (3.25 × 10−6 mm3/N mm) among all samples. The values increased approximately 2 times Si-2 wt% compared its 1 h counterpart.