LAUSR

Abstract In this paper, the tensile behavior of a high velocity oxygen fuel (HVOF) sprayed NiCoCrAlYCe coating coupled with acoustic emission (AE) has been investigated. The results indicate that the NiCoCrAlYCe coating is composed of β-NiAl and γ-Ni phases and the ratio of peak intensity between β-NiAl and γ-Ni phases is lower than that of the NiCoCrAlYCe feedstock in XRD patterns. The bonding stength of the NiCoCrAlYCe coating is 56.5 ± 4.8 MPa and the fracture occurs within the coating. Based on AE signals, there are two stages during the uniaxial tension, i.e., weak crack activity from pre-existing cracks in the stage I and strong crack activity from initiated cracks in the stage II. The number of catactrophic cracks propagation in the stage II enhances more rapidly than that in the stage I from the wavelet transformation. Finally, the tensile failure mechanism of the NiCoCrAlYCe coating has been proposed.