Abstract Tri-dissimilar Ti/Al/Nb multilayer composites were produced from Ti, Al and Nb sheets by solid state diffusion bonding through hot pressing and subsequent hot rolling. By annealing the produced composites at temperatures higher than the melting point of Al, the microstructures consisted of dispersed intermetallic particles in an Al matrix were obtained. The microstructural characterizations were performed by scanning electron microscope, X-ray diffraction and transmission electron microscope. Also, the interactions between Ti, Al and Nb were studied by observation of the microstructural evolutions during annealing at different temperatures (700–760 °C) and durations (30–120 min). Results showed that there are three distinct regions in the diffusion reaction zone (DRZ). In the first region, irregular shaped and angular particles were observed, which are distributed in a wide region of Al matrix. Prolonged annealing times caused formation of a dense intermetallic compound (Ti, Nb)Al3 layer. The second region has consisted of only Al matrix and in the third region, TiAl3 spherules were formed and expelled into the liquid by new TiAl3 spherules and, the composition of these particles is changed to (Ti,Nb)Al3 after prolonged annealing times.

中文翻译：

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三金属Ti/Al/Nb复合材料反应机理及金属间化合物形成研究

摘要 以Ti、Al、Nb片材为原料，通过热压和后续热轧的固相扩散结合制备了三异种Ti/Al/Nb多层复合材料。通过在高于铝熔点的温度下对生产的复合材料进行退火，获得了由分散在铝基体中的金属间化合物颗粒组成的微观结构。通过扫描电子显微镜、X 射线衍射和透射电子显微镜进行显微结构表征。此外，通过观察在不同温度（700-760°C）和持续时间（30-120 分钟）下退火过程中的微观结构演变，研究了 Ti、Al 和 Nb 之间的相互作用。结果表明，在扩散反应区（DRZ）中有三个不同的区域。在第一区，观察到不规则形状和角状颗粒，它们分布在铝基体的大范围内。延长退火时间导致形成致密的金属间化合物 (Ti, Nb)Al3 层。第二个区域仅由 Al 基体组成，在第三个区域中，TiAl3 球粒形成并被新的 TiAl3 球粒排出到液体中，这些颗粒的成分在延长退火时间后变为 (Ti,Nb)Al3。