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Microstructure and shear strength of reactive brazing joints of TiAl/Ni-based alloy

Transactions of Nonferrous Metals Society of China 2012年第2期22卷 324-329页

作者：李海新何鹏林铁松潘峰冯吉才黄玉东哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001 哈尔滨工业大学化工学院哈尔滨150001

reactive brazing of TiAl-based intermetallics and Ni-based alloy with Ti foil as interlayer was investigated. The interfacial microstructure and shear strength of the joints were studied. According to the experimental observations, the molten interlayer reacts vigorously with base metals, forming several continuous reaction layers. The typical interfacial microstructure of the joint can be expressed as GH99/（Ni,Cr）ss（γ）/TiNi（β2）＋TiNi2Al（τ4）＋Ti2Ni（δ）/δ＋Ti3Al（α2）＋Al3NiTi2（τ3）/α2＋τ3/TiAl. The maximum shear strength is 258 MPa for the specimen brazed at 1000°C for 10 min. Higher brazing temperature or longer brazing time causes coarsening of the phases in the brazing seam and formation of brittle intermetallic layer, which greatly depresses the shear strength of the joints.

关键词： TiA1 Ni-based alloy reactive brazing interfacial microstructure shear strength

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Joining of activated graphite to 6063 aluminum alloy with Al-Cu-Si-Ni-Mg filler metal

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China Welding 2020年第4期29卷 60-64页

作者： Yuan Linlin Huang Xiaomeng Chen Xiaoyu Qi Yuefeng Beijing Non-ferrous Metals and Rare Earth Research Institute Beijing 100012China Beijing Engineering Research Center of New brazing Materials for Electronic Information Beijing 100012China

In this work, 6063 aluminum alloy-graphite joint intended for thermal conductive application were realized by applying Al-CuSi-Ni-Mg brazing filler metal and Ag-Cu-Ti pasted on high density graphite substrate to ensure wetting during the brazing process. The interface reactions during brazing and mechanical properties were studied using scanning electron microscopy(SEM) and shear test *** was formed at the graphite/active Ag-Cu-Ti paste interface due to the reaction between Ti and C, and thus the wettability on the graphite was *** is shown that joint with a good quality can be produced at a brazing temperature of 550 ℃ for 10 *** average tensile strength of the joint is 21 MPa. thus the wettability on the graphite was *** is shown that joint with a good quality can be produced at a brazing temperature of 550 ℃ for 10 min.

关键词： graphite aluminum alloy metallization reactive brazing

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