This study investigates the interface, microstructure, and mechanical properties of layered Ni/Ni-Ni₃Al/Ni composite, fabricated by spark plasma sintering (SPS). Crack propagation behavior and joining mechanisms of particles in this layered composite were comprehensively studied and discussed. Ni₃Al powders were first synthesized using mechanical alloying. Particulate Ni-Ni₃Al composite was then produced by mixing 60 wt.% Synthesized Ni₃Al and 40 wt.% Ni powders. The layered composite was then synthesized by SPS. Samples were held at 970°C for 10 minutes to do sintering. Results showed that a uniform interface has been formed between different layers of composite, without any obvious evidence of delamination, cracks, or flaws in-between layers. Moreover, there was hardly any sharp boundary/interface and necking between particles is discernible, inferring that applied sintering has resulted in rather complete densification. Based on the obtained results, interfaces were categorized into three different interface types: Ni-Ni, Ni₃Al-Ni₃Al, and Ni-Ni₃Al. Results showed that intermetallic joints were less diffused and were less sintered, while metallic interfaces were much more diffused. Overall, complete sintering and diffusion for metal and kiss bonding or even cavities for intermetallic interfaces are more usual. The attribution of different interface structures to the mechanical properties and fracture behavior of the fabricated composite was thoroughly discussed. Results showed that a sample with a mixed Ni/Ni₃Al mid-layer has an improved shear strength, when compared to the case where pure Ni₃Al is used as the mid-layer.

本研究调查了通过放电等离子烧结 (SPS) 制造的层状 Ni/Ni-Ni ₃ Al/Ni 复合材料的界面、微观结构和机械性能。对这种层状复合材料中颗粒的裂纹扩展行为和连接机制进行了全面的研究和讨论。Ni ₃ Al 粉末首先使用机械合金化合成。然后通过混合 60 wt.% 合成 Ni _{3 来}生产颗粒状 Ni-Ni ₃ Al 复合材料Al 和 40 wt.% Ni 粉末。然后通过SPS合成层状复合材料。样品在 970°C 下保持 10 分钟以进行烧结。结果表明，复合材料的不同层之间形成了均匀的界面，层间没有任何明显的分层、裂纹或缺陷迹象。此外，几乎没有任何尖锐的边界/界面和颗粒之间的颈缩是可辨别的，推断应用烧结导致了相当完全的致密化。根据获得的结果，界面分为三种不同的界面类型：Ni-Ni、Ni ₃ Al-Ni ₃ Al 和 Ni-Ni ₃阿尔。结果表明，金属间接头扩散较少，烧结较少，而金属界面扩散较多。总体而言，金属的完全烧结和扩散以及金属间界面的接吻甚至空腔更为常见。深入讨论了不同界面结构对制造复合材料的机械性能和断裂行为的归因。结果表明，与使用纯 Ni ₃ Al 作为中间层的情况相比，具有混合 Ni/Ni ₃ Al 中间层的样品具有提高的剪切强度。