Dynamic mechanical behavior of WC-Co coated A356.2 aluminum alloy

• Published in: Journal of alloys and compounds 2018-10, Vol.767, p.988-993
• Main Authors: Siva Prasad, Dora, Radha, Palukuri Tualsi, Shoba, Chintada, Rao, Pujari Srinivasa
• Format: Article
• Language: English
• Subjects: Aluminum alloys; Aluminum base alloys; Carburization (corrosion); Carburizing; Cemented carbides; Coating effects; Corrosion; Damping; Damping capacity; Flame spraying; HVOF; Mechanical properties; Microhardness; Microstructure; Numerical analysis; Optimum coating thickness; Protective coatings; Storage modulus; Tungsten carbide; WC-Co coating
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.07.203

The effect of WC-Co coating on dynamic mechanical behavior, specifically storage modulus and mechanical damping of A356.2 aluminum alloy was studied. High velocity oxygen fuel (HVOF) is used as deposition technique and the optimum coating thickness was estimated with the aid of a numerical analysis. The experiments were carried using dynamic mechanical analyzer at 0.1, 1 and 10 Hz over an uninterrupted heating temperature from room temperature to 150 °C. It has been found that the damping behavior was significantly improved by depositing WC-Co on the alloy. The interface between the coating and the base alloy plays a vital role in enhancing the damping capacity, however the presence of W2C phase in the coatings due to the de-carburization of WC decreases the storage modulus of alloy. •An optimum coating thickness has been obtained for maximum Etanδ.•The WC-Co coated alloy exhibit higher mechanical damping than that of the un-coated alloy.•The damping of the WC-Co coated alloy increases with temperature and frequency.•The storage modulus for all the specimens is found to decrease with increasing temperature.•No peeling of the coating was noticed even at high frequencies.