Ni-Al Intermetallic Coatings Prepared by Laser-cladding Synthesize with Ni-based Alloy and Al
CHENG Guang-ping, HE Yi-zhu
1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243002, Anhui, China; 2. Anhui Key Lab of Metal Material and Processing, Maanshan, 243002, Anhui, China
Abstract:Ni-Al intermetallic compound coatings were prepared on mild steel substrate by laser-cladding synthesize with mixed powders of Ni-based alloy and Al.The coatings microstructure and phase constitution were studied with SEM,EDX,TEM and XRD.The results show that the two-phase microstructure of the coating consists mainly of β-NiAl and γ′-Ni3Al,with a certain amount of Fe and Si are retained in both solution.β-NiAl are uniformity and staggered fine dendrites surrounded continuously by γ′-Ni3Al,which is beneficial to reduce the coating brittleness.Compact coats jointed metallurgically with the steel are obtained on 1.5kW powers,a few pores but no cracks are also found in the claddings.