YANG Haozhe, PEI Yinyin, QIN Jian, et al.Microstructure and Mechanical Properties of Pure Titanium TA2 Vacuum Brazing Joint with TiZrCuNi Powder Brazing Filler Metal[J].Electric Welding Machine, 2022, 52(6): 112-117.
Vacuum brazing of commercial pure Titanium TA2 was realized by using Ti37.5Zr37.5Cu15Ni10 powder BFM at 940 ℃×20 min. The microstructure and mechanical properties of the brazing joint were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), universal testing machine and microhardness tester. The results show that the typical interfacial structure of brazing joints is TA2/ acicular α-Ti+eutectoid structure (α-Ti+(Ti,Zr),2,(Cu,Ni))+ residual filler metal /TA2.Cu and Ni elements mainly exist in eutectoid structure and residual filler metal, while Zr distributes in eutectoid structure, residual filler metal and acicular α-Ti. The room temperature shear strength of the brazing joint is 322 MPa. The Vickers hardness increases gradually from the base metal to the center of the brazing seam, and the eutectoid hardness of the center of brazing seam is about 307 HV10, which is more than twice that of the base metal. The fracture analysis results show that the crack propagates along the brazing seam, and the fracture morphology has the characteristics of intergranular dimple, elongated dimple and cleavage fracture. The fracture is ductile and brittle composite fracture mode.
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