Micro hardness and corrosion properties of A390 alloy + x vol.% zirconium dioxide (ZrO₂) composites processed by P/M method
by S. Karthikeyan; M. Subramanian; Ashoke Ghosh; M. Prashanth; R. Karunanithi
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 14, No. 6, 2019

Abstract: A390+X vol.% ZrO₂ (X = 5, 10, 15) composites have been fabricated through P/M technique. The mixed aluminium alloy and zirconium oxide powders were cold compacted at 200 MPa and sintered at 580°C for 3 h. The influence of ZrO₂ reinforcement on microstructure, physical, and electrochemical behaviour of fabricated composites were examined. The results convey that the composites have relative density of 99%. Potentio dynamic polarisation studies on A390 and A390+Xvol.% ZrO₂ composites in 3.5 wt.% of NaCl solution revealed that the addition of ZrO₂ in Al alloy shifts the corrosion potentials towards positive direction. The increase of ZrO₂ content in A390 alloy increases the corrosion current density due to the expansion in particle-matrix interface area. The research goal is to develop a new metal matrix composite material, by powder metallurgy (P/M) technique and experimentally investigate the various mechanical, physical properties and corrosion study, for ensuring that the developed material could be used in pistons.

Online publication date: Mon, 21-Oct-2019

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