摘要：

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′-Ni 3Al,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′-Ni 3Al,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.

展开