Investigations on the mechanics and tribology of multilayer graphene nanosheet in TiAl aviation composites

Requirements of low energy consumption and material-volume reduction in the aerospace industry have spurred improvements mechanical tribological behaviors TiAl (TA) alloys. TA-graphene (TAG) has poorer properties (6.02 ± 0.42 GPa nano-hardness, 150 12.32 elasticity modulus, 802 21 MPa yield strength) than (6.25 0.52 159 14.21 850 19 TA-graphene-silver (TAGS). Multilayer graphene nanosheets were curled into small loops to resist applied forces, helped improve TAGS. Subsequently, enhanced performances as observed by ball-on-disk tribometer. The following factors primarily responsible for more excellent (approximately 0.27 friction coefficient, 2.82 × 10 −4 mm 3 N −1 m wear rate) TAGS those TAG: intra-lamellar separation graphene, graphene-enhanced capacity scar, plastic deformation silver, cooperation lubrication graphene-silver, low-hardness film on grain-refined layer, well-distributed grain, grain orientation angles.