摘要
The process of reaction kinetics was investigated for vacuum diffusion bonding of Ti 2AlNb and GH4169 by inserting metal foils of Ni+Nb as interlayer. The results show that there is an optimum thickness (about 3.36 μm) for the reaction layer Ni 6Nb 7, which is the main factor that influences the joint's shear strength. The modified effective heat of formation (MEHF) theory and the effective Gibbs free energy theory were applied to predict that Ni 6Nb 7 is the primary phase formed during Ni-Nb interface reaction, i.e., Ni 6Nb 7 phase inevitably forms during the bonding process. The growth rate of Ni 6Nb 7 layer is lower than that of Ni 3Nb layer. Thus it is possible to control the thickness of Ni 6Nb 7 layer by optimizing the processing parameters so as to improve the mechanical properties of the joints. The optimized duration time for the samples bonded at 1050°C under 20 MPa is 49.5 min. This condition issues experimental shear strength of the joint as 468.2 MPa.
源语言 | 英语 |
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页(从-至) | 2106-2110 |
页数 | 5 |
期刊 | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
卷 | 40 |
期 | 12 |
出版状态 | 已出版 - 12月 2011 |