Effect of Ni-P Coating on Microstructure and Mechanical Properties of Cu/AI Brazed Joints
To investigate the effect of Ni-P coating on the interfacial reactions in Cu/Al dissimilar metal brazing,a chemical plating method was employed to nickel plate T2 copper,followed by brazing of the Cu/Al joints using the induction brazing technique with BA188Si flux-cored filler metal.Scanning electron microscopy and electron backscatter diffraction were utilized for microstructural observation and phase analysis of the joints.Mechanical testing was performed to analyze the influence of the coating on the microstructure and mechanical properties of the Cu/Al joints,while also exploring the interface formation mechanism of different brazing joints during the brazing process.The results reveal the formation of intermetallic compounds Cu9Al4 and CuA12 at the interface of uncoated joints,whereas intermetallic compounds Al2Ni and Al3Ni are formed at the interface of the coated joints.The tensile strength of uncoated joints reaches to 56.4 MPa,outperforming that of coated joints.Brittle fractures occurre in all joints,with the fracture location transitioning from the interface of CuAl2 and the a-Al solid solution in uncoated joints to the Al3Ni intermetallic compound in coated joints.
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