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| Citation: |
XU Jingxin, HU Shengpeng, SONG Xiaoguo, CHEN Xu, BIAN Hong, CAO Jian, SHEN Yuanxun. Interfacial microstructure and mechanical property of Ti60 and Ti2AlNb joint brazed with TiZrNiCu filler metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20240330001
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The Ti60 titanium alloy was successfully vacuum brazed with Ti2AlNb titanium alloy by using TiZrNiCu filler metal. The interfacial microstructure and possible phases of the joints, as well as the fracture form of fractures, were detected by SEM and EDS. Effects of the brazing temperature on the interfacial microstructure and mechanical properties of the joints were investigated. The results show that the typical interfacial microstructure was Ti60/α + β/(Ti,Zr)2(Ni,Cu)/α + β/B2/β/Ti2AlNb. As the brazing temperature increased, the content of (Ti,Zr)2(Ni,Cu) phase decreased and they distributed more evenly. The lower brazing temperature caused the thick brittle layer, making it prone to microcracks and becoming a weak link in the joint. Besides, the lamellar α + β microstructure was formed when the brazing temperature was too high. With increasing of brazing temperature, shear strength of the joints was first increased and then decreased. The maximum shear strength of 283.9 MPa was obtained at the brazing temperature of 980 ℃ for 10min. Fracture analysis indicated that the joints were fractured at brazing seam, which performed as brittle fracture．
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