Ni箔厚度对Ti65/Nb521接触反应钎焊接头组织与性能的影响

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Abstract：Using Ni foils of different thicknesses （ 10μm 50μm and 100μm ），contact reaction brazing of Ti65 and Nb521 alloys was performed at 1150∘C for 20min . The influence of Ni foil thickness on interfacial microstructure evolution and mechanical properties was investigated.Results show that Ni foil thickness critically governs interfacial reactions，increasing foil thickness leads to aprogressive increase in reaction layer thickness.At 100μm interfacial reactions aremarkedly intensified，producing a thick，complex reaction layer with abundant britle intermetalliccompounds.Although all joints exhibit dense metalurgical bonding，their mechanical properties difer significantly. The joint brazed with a 50μm Ni foil achieves the highest shear strength of 394MPa ，with fracture occurring in the Nb521 base metal. In contrast，excessive britle phase formation with a 100μm Ni foil degrades interfacial bonding and significantly reduces shear strength.These results demonstrate that controlling Ni foil thickness is an effective approach to tailoring the interfacial microstructure and mechanical performance of Ti65/ Nb521 dissmilar metal brazed joints for high-temperature applications.

Keywords：Ni foil; Ti65/Nb521 dissimilar metals;contact reaction brazing; interfacial microstructure; mechanical properties

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Ti65钛合金是在Ti60钛合金基础上研制的一种近 α 型高温钛合金，具备优异的高温强度、抗蠕变性及耐腐蚀性能，在约 650°C 长期服役条件下仍能保持性能稳定，广泛应用于航空发动机叶片等高温构件[2]。（剩余7161字）