Microstructure and mechanical properties of twin-wire arc sprayed Ni-Al composite coatings on 6061-T6 aluminum alloy sheet

• Published in: International journal of minerals, metallurgy and materials Vol. 21; no. 5; pp. 469 - 478
• Main Authors: Wang, Ji-xiao, Liu, Jing-shun, Zhang, Lun-yong, Sun, Jian-fei, Wang, Zhi-ping
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.05.2014; Springer Nature B.V; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China%School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China%National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China%college of science, Civil Aviation University of China, Tianjin 300300, China
• Subjects: Abrasive wear; Abrasive wheels; Adhesive wear; Aluminum; Aluminum alloys; Aluminum base alloys; Aluminum coatings; Arc spraying; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coatings; Composite coatings; Composites; Corrosion and Coatings; Diamond pyramid hardness; Diffusion; Diffusion coating; Diffusion coatings; Glass; Grain growth; Heat treatment; High temperature; Intermetallic compounds; Intermetallics; Materials Science; Mechanical properties; Metal sheets; Metallic Materials; Microstructure; Natural Materials; Nickel; Nickel aluminides; Nickel base alloys; Nickel compounds; Substrates; Surfaces and Interfaces; Thin Films; Tribology; Wear resistance; Wear tests; Wire; 力学性能; 双丝; 喷涂; 复合涂层; 微观结构; 电弧; 铝合金板材; 镍铝; composite coatings; intermetallics; diffusion; spraying; aluminum alloys; mechanical properties
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-014-0931-8

We have systematically studied the microstructure and mechanical properties of Ni-5wt%Al and Ni-20wt%Al composite coat- ings fabricated on 6061-T6 aluminum alloy sheet by twin-wire arc spraying under different experimental conditions. The abrasive wear be- havior and interface diffusion behavior of the composite coatings were evaluated by dry/wet rubber wheel abrasive wear tests and heat treat- ment, respectively. Experimental results indicate that the composite coatings exhibit features of adhesive wear. Besides, the Vickers micro- hardness of NiA1 and Ni3AI 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 ex- ponent n of diffusion kinetics of the Ni-Al coating, calculated via a high-temperature diffusion model at 400, 480, and 550℃, is between 0.28 and 0.38. This satisfies the cubic law, which is consistent with the general theoretical relationship of high-temperature diffusion.