Effect of Heat Treatment to Twin-Wire Arc Spraying Ni-5wt.%Al Coating on 6061-T6 Aluminum Alloy Diffusion

J.X. Wang; J.F. Sun; Z.P. Wang

doi:10.4028/www.scientific.net/AMR.631-632.424

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 631-632Effect of Heat Treatment to Twin-Wire Arc Spraying...

Effect of Heat Treatment to Twin-Wire Arc Spraying Ni-5wt.%Al Coating on 6061-T6 Aluminum Alloy Diffusion

Abstract:

In this study, Ni-5wt.%Al coating was fabricated on the 6061-T6 aluminum alloy substrate by twin-wire arc spraying technology. Through different heat treatment process, effect of microstructure and phase structure was studied with different temperature and time. Interface reaction mechanism of alloy coating/substrate and diffusion behavior of elements was discussed. Heat treatment was carried out at 400°C，480°C，550°C and respective for 4h, 24h, 48h. The XRD , SEM and EDS results showed that main phases of Ni-5wt.%Al original coating were composed of Ni solid solution, in addition to a small amount of Al₂O₃, NiO and Al₄Ni₃. Phase composition has basically not changed, interface of the coating/substrate occurred diffusion, which was controlled by the diffusion of Al atoms. Intermetallic compounds of NiAl3 and Ni₂Al₃ were formed in interface of coating/substrate, and interface diffusion area gradually was thickened.

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Periodical:

Advanced Materials Research (Volumes 631-632)

Pages:

424-428

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.631-632.424

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Online since:

January 2013

Authors:

J.X. Wang, J.F. Sun, Z.P. Wang

Keywords:

Coating, Diffusion, Ni-5wt.%Al

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