Research on the Microstructure and Micro-Mechanics Properties of NiAl Intermetallic Coatings
A new thermal spraying technique, electro-thermal explosion directional spraying (EEDS), was used to prepare NiAl intermetallic coatings. The microstructure, elements distribution and phase structures were determined by means of SEM, EDAX and X-Ray diffraction, respectively. Micro-mechanics properties were tested by using nano-indentation tester. The wear resistance of the coating was also investigated. Results showed that NiAl coating was characterized by compact construction. The main phase of the coating was Ni-Al and the content of oxide was little. The obvious elements diffusion showed that the bond between the coating and the substrate was metallurgical one. The nano-hardness and the modulus were 7.6 GPa and 218.8 GPa, respectively. The coatings processed good wear resistance and the main wear failure mechanism was the micro-plowing.
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
G. Jin et al., "Research on the Microstructure and Micro-Mechanics Properties of NiAl Intermetallic Coatings", Key Engineering Materials, Vols. 324-325, pp. 675-678, 2006