Influence of multi-pass FSP on the microstructure, mechanical properties and tribological characterization of Al/B4C composite fabricated by accumulative roll bonding (ARB)

By M. Paidar, Ojo Olatunji Oladimeji, H. Ezatpour, A. Heidarzadeh. Surface & Coatings Technology, 2019

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Abstract This paper aims to understand the impact of post-multi-pass friction stir processing (FSP) on the microstructure, mechanical, wear and fracture behaviors of the fabricated 10 cycle-accumulative roll bonded Al-2%B4C composites. The increase in the number of tool-passes directly improved homogeneity and fragmentation of B4C particles, microhardness, tensile strength (86.84–173.92 MPa) and fracture resilience of the Al-2%B4C composite. The tribological properties of the composite are improved with a rise in the number of tool passes. Wear rate, upper boundaries and mid-fluctuation lines of the friction coefficient decreased from 6.198 × 10−5 to 1.095 × 10−5 mm3/Nm, 0.56 to 0.19, and 0.31 to 0.11 respectively as the number of tool passes was varied between 1 and 8 passes. An increase in the sliding distance caused an overshoot of the complete waveform of friction coefficient to be above the mid-line of fluctuation due to the induced frictional/thermal input emanating from the prolonged surface-surface contact. Homogenous particle dispersion imposes abrasion wear mechanism on the composite. Ductile fracture is the predominant failure mode of the composites. Post-multi-pass friction stir processing of the accumulative roll bonded Al-2%B4C composite is an effective approach of achieving high performance in Al-B4C composite.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/4dc754b3f92314b756c79db2396849af78a3f9fe