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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。
In dissimilar material diffusion bonded joints, when brittle intermetallics are produced at the interface, joints tend to exhibit poor mechanical properties. Therefore, starting from the theory of production and application of diffusion bonding and the theory of diffusion bonding, it is very important to study the generation rules of interface intermetallics in diffusion bonding joints and further to control them. The mechanism of formation and growth of intermetallics at diffusion bonding interface is diffusion-controlled reaction-diffusion mechanism, and phase transitions are often accompanied by phase transitions. Therefore, the interfacial reaction mechanism of phase transition diffusion bonding is more complicated. In this paper, according to the particularity of phase change diffusion bonding, a mathematical model of element diffusion and intermetallic compound phase formation and growth behavior in titanium / stainless steel phase transition diffusion bonding interface was established. The experimental results show that the model is in good agreement with the actual situation, which can provide reference for the formulation of phase change diffusion bonding process parameters.