Konopka Katarzyna, Krasnowski Marek, Zygmuntowicz Justyna, Cymerman Konrad, Wachowski Marcin, Piotrkiewicz Paulina
Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Woloska St., 02-507 Warsaw, Poland.
Faculty of Mechanical Engineering, Military University of Technology, 2 gen. S. Kaliskiego St., 00-908 Warsaw, Poland.
Materials (Basel). 2021 Jun 19;14(12):3398. doi: 10.3390/ma14123398.
The paper describes an investigation of AlO samples and NiAl-AlO composites consolidated by pulse plasma sintering (PPS). In the experiment, several methods were used to determine the properties and microstructure of the raw AlO powder, NiAl-AlO powder after mechanical alloying, and samples obtained via the PPS. The microstructural investigation of the alumina and composite properties involves scanning electron microscopy (SEM) analysis and X-ray diffraction (XRD). The relative densities were investigated with helium pycnometer and Archimedes method measurements. Microhardness analysis with fracture toughness (K) measures was applied to estimate the mechanical properties of the investigated materials. Using the PPS technique allows the production of bulk AlO samples and intermetallic ceramic composites from the NiAl-AlO system. To produce by PPS method the NiAl-AlO bulk materials initially, the composite powder NiAl-AlO was obtained by mechanical alloying. As initial powders, Ni, Al, and AlO were used. After the PPS process, the final composite materials consist of two phases: AlO located within the NiAl matrix. The intermetallic ceramic composites have relative densities: for composites with 10 wt.% AlO 97.9% and samples containing 20 wt.% AlO close to 100%. The hardness of both composites is equal to 5.8 GPa. Moreover, after PPS consolidation, NiAl-AlO composites were characterized by high plasticity. The presented results are promising for the subsequent study of consolidation composite NiAl-AlO powder with various initial contributions of ceramics (AlO) and a mixture of intermetallic-ceramic composite powders with the addition of ceramics to fabricate composites with complex microstructures and properties. In composites with complex microstructures that belong to the new class of composites, in particular, the synergistic effect of various mechanisms of improving the fracture toughness will be operated.
本文描述了对通过脉冲等离子体烧结（PPS）固结的AlO样品和NiAl-AlO复合材料的研究。在实验中，使用了几种方法来测定原始AlO粉末、机械合金化后的NiAl-AlO粉末以及通过PPS获得的样品的性能和微观结构。对氧化铝和复合材料性能的微观结构研究包括扫描电子显微镜（SEM）分析和X射线衍射（XRD）。使用氦比重瓶和阿基米德法测量来研究相对密度。采用带有断裂韧性（K）测量的显微硬度分析来估计所研究材料的力学性能。使用PPS技术能够从NiAl-AlO体系生产块状AlO样品和金属间陶瓷复合材料。为了首先通过PPS方法生产NiAl-AlO块状材料，通过机械合金化获得了复合粉末NiAl-AlO。使用Ni、Al和AlO作为初始粉末。经过PPS过程后，最终的复合材料由两相组成：AlO位于NiAl基体中。金属间陶瓷复合材料的相对密度为：含10 wt.% AlO的复合材料为97.9%，含20 wt.% AlO的样品接近100%。两种复合材料的硬度均等于5.8 GPa。此外，经过PPS固结后，NiAl-AlO复合材料具有高塑性。所呈现的结果对于后续研究具有不同初始陶瓷（AlO）含量的固结复合NiAl-AlO粉末以及添加陶瓷的金属间陶瓷复合粉末混合物以制造具有复杂微观结构和性能的复合材料很有前景。在属于新型复合材料的具有复杂微观结构的复合材料中，特别是，将发挥各种提高断裂韧性机制的协同效应。
