Mechanical and tribological performance of a hybrid MMC coating deposited on Al-17Si piston alloy by laser composite surfacing technique

M M Quazi; M Ishak; A Arslan; M A Fazal; Farazila Yusof; B S Sazzad; M Nasir Bashir; M Jamshaid

doi:10.1039/c7ra08191j

Mechanical and tribological performance of a hybrid MMC coating deposited on Al-17Si piston alloy by laser composite surfacing technique

RSC Adv. 2018 Feb 13;8(13):6858-6869. doi: 10.1039/c7ra08191j. eCollection 2018 Feb 9.

Authors

M M Quazi^{1

2}, M Ishak¹, A Arslan², M A Fazal^{2

3}, Farazila Yusof², B S Sazzad⁴, M Nasir Bashir², M Jamshaid²

Affiliations

¹ Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaysia Pahang Pekan 26600 Malaysia engrmoinquazi@gmail.com +60-192048281.
² Department of Mechanical Engineering, Faculty of Engineering, University of Malaya 50603 Kuala Lumpur Malaysia.
³ Department of Mechanical Engineering, University of Jeddah Saudi Arabia.
⁴ Department of Mechanical Engineering, International University of Business Agriculture and Technology Dhaka Bangladesh.

Abstract

Laser composite surfacing (LCS) is a photon driven manufacturing technology that can be utilized for depositing hybrid metal matrix composite coatings (HMMC) on softer Ti/Al/Mg alloys to enhance their tribo-mechanical properties. LCS offers the advantages of higher directionality, localized microstructural refinement and higher metallurgical bonding between coating and substrate. The current research presents the tribo-mechanical evaluation and characterization of solid lubricant based Ni-WC coatings deposited by LCS on Al-Si piston alloy by varying the concentration of graphite between 5-to-15-weight percentage. The tribological behavior of LCS samples was investigated using a ball-on-plate tribometer. Results indicate that the surface hardness, wear rate and friction coefficient of the Al-Si hypereutectic piston alloy were improved after LCS of graphite based HMMC coatings. The maximum surface hardness of 781H _v was acquired for the Ni-WC coating containing 5 wt% graphite. The friction coefficient of Al-Si under dry sliding conditions was reduced from 0.47 to 0.21. The reduction in the friction coefficient was attributed to the formation of a shearable transfer layer, which prevented delamination and reduced adhesion, abrasion and fatigue cracking.