Microstructure and mechanical properties of twin-wire arc sprayed Ni-Al composite coatings on 6061-T6 aluminum alloy sheet
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第5期
论文作者：Ji-xiao Wang Jing-shun Liu Lun-yong Zhang Jian-fei Sun Zhi-ping Wang
文章页码：469 - 478
摘 要：We have systematically studied the microstructure and mechanical properties of Ni-5wt%Al and Ni-20wt%Al composite coatings fabricated on 6061-T6 aluminum alloy sheet by twin-wire arc spraying under different experimental conditions.The abrasive wear behavior and interface diffusion behavior of the composite coatings were evaluated by dry/wet rubber wheel abrasive wear tests and heat treatment,respectively.Experimental results indicate that the composite coatings exhibit features of adhesive wear.Besides,the Vickers microhardness of NiAl and Ni3Al intermetallic compounds is relatively larger than that of the substrate,which is beneficial for enhancing the wear resistance.With the increase of annealing temperature and time,the interface diffusion area between the Ni-Al coating and the substrate gradually expands with the formation of NiAl3 and Ni2Al3 phases,and is controlled by diffusion of aluminum atoms.The grain growth exponent n of diffusion kinetics of the Ni-Al coating,calculated via a high-temperature diffusion model at 400,480,and 550°C,is between 0.28 and 0.38.This satisfies the cubic law,which is consistent with the general theoretical relationship of high-temperature diffusion.
Ji-xiao Wang1,2，Jing-shun Liu3，Lun-yong Zhang4，Jian-fei Sun1，Zhi-ping Wang5
1. School of Materials Science and Engineering,Harbin Institute of Technology2. Harbin Welding Institute,China Academy of Machinery Science & Technology3. School of Materials Science and Engineering,Inner Mongolia University of Technology4. National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering,Nanjing University5. College of science,Civil Aviation University of China
摘 要：We have systematically studied the microstructure and mechanical properties of Ni-5wt%Al and Ni-20wt%Al composite coatings fabricated on 6061-T6 aluminum alloy sheet by twin-wire arc spraying under different experimental conditions.The abrasive wear behavior and interface diffusion behavior of the composite coatings were evaluated by dry/wet rubber wheel abrasive wear tests and heat treatment,respectively.Experimental results indicate that the composite coatings exhibit features of adhesive wear.Besides,the Vickers microhardness of NiAl and Ni3Al intermetallic compounds is relatively larger than that of the substrate,which is beneficial for enhancing the wear resistance.With the increase of annealing temperature and time,the interface diffusion area between the Ni-Al coating and the substrate gradually expands with the formation of NiAl3 and Ni2Al3 phases,and is controlled by diffusion of aluminum atoms.The grain growth exponent n of diffusion kinetics of the Ni-Al coating,calculated via a high-temperature diffusion model at 400,480,and 550°C,is between 0.28 and 0.38.This satisfies the cubic law,which is consistent with the general theoretical relationship of high-temperature diffusion.
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