相变扩散连接界面生成金属间化合物的数值模拟
Numeric Simulation for Interface Intermetallic Compounds of Phase Transformation Diffusion Bonding
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摘要: 在异种材料扩散连接的接头中,当界面上有脆性的金属间化合物产生时,接头往往表现出较差的力学性能。因此,从扩散连接的生产应用及扩散连接的理论研究出发,研究扩散连接接头的界面金属间化合物的生成规律,进而对其控制,是有着非常重要的现实意义的。扩散连接界面上金属间化合物的生成及成长机制是受扩散控制的反应扩散机制,而相变扩散连接中往往还伴随着相变,因此相变扩散连接的界面反应机制更为复杂。本文根据相变扩散连接的特殊性,建立了钛/不锈钢相变扩散连接界面区元素扩散、金属间化合物相的生成和成长行为的数学模型。模型经试验验证与实际吻合较好,可以为相变扩散连接工艺参数的制定提供一定参考。Abstract: The formation of brittle intermetallic compounds at the interfaces of diffusion bonds in dissimilar materials is the main cause which leads to produce poor bond properties. Therefore it is very important for the diffusion bonding theory development and application to research and controls the formation of intermetallic compounds at the interfaces. The formation of brittle intermetallic compounds at the interfaces of diffusion bonds is the diffusion-controlled reaction process. Furthermore, the phase transformation of phase transformation-diffusion bonding brings more sophisticated interface reaction. In this paper according to the characteristics of phase transformation diffusion bonding, the element diffusion of interface and the growing model of interface intermetallic compounds were established. The computed results were in agreement with the experimental data. It can provide reference to the choice of phase transformation diffusion bonding parameters.
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