Piechowiak Daria, Kania Albert, Łukaszkiewicz Natalia, Miklaszewski Andrzej
Institute of Materials Science and Engineering, Poznań University of Technology, Jana Pawla II 24, 61-138 Poznan, Poland.
Materials (Basel). 2023 Mar 1;16(5):2048. doi: 10.3390/ma16052048.
In this work, NiAl-xWC (x = 0 - 90 wt.% WC) intermetallic-based composites were successfully synthesized by mechanical alloying (MA) and a hot-pressing approach. As initial powders, a mixture of nickel, aluminum and tungsten carbide was used. The phase changes in analyzed systems after mechanical alloying and hot pressing were evaluated by an X-ray diffraction method. Scanning electron microscopy and hardness test examination were used for evaluating microstructure and properties for all fabricated systems from the initial powder to the final sinter stage. The basic sinter properties were evaluated to estimate their relative densities. Synthesized and fabricated NiAl-xWC composites showed an interesting relationship between the structure of the constituting phases, analyzed by planimetric and structural methods and sintering temperature. The analyzed relationship proves that the structural order reconstructed by sintering strongly depends on the initial formulation and its decomposition after MA processing. The results confirm that it is possible to obtain an intermetallic NiAl phase after 10 h of MA. For processed powder mixtures, the results showed that increased WC content intensifies fragmentation and structural disintegration. The final structure of the sinters fabricated in lower (800 °C) and higher temperature regimes (1100 °C), consisted of recrystallized NiAl and WC phases. The macro hardness of sinters obtained at 1100 °C increased from 409 HV (NiAl) to 1800 HV (NiAl + 90% WC). Obtained results reveal a new applicable perspective in the field of intermetallic-based composites and remain highly anticipated for possible application in severe-wear or high-temperature conditions.
在本研究中，通过机械合金化（MA）和热压方法成功合成了NiAl-xWC（x = 0 - 90 wt.% WC）金属间化合物基复合材料。使用镍、铝和碳化钨的混合物作为初始粉末。通过X射线衍射法评估了机械合金化和热压后分析体系中的相变。利用扫描电子显微镜和硬度测试来评估从初始粉末到最终烧结阶段所有制备体系的微观结构和性能。评估了基本烧结性能以估计其相对密度。通过平面测量和结构方法分析，合成并制备的NiAl-xWC复合材料在组成相的结构与烧结温度之间呈现出有趣的关系。分析的关系证明，烧结重构的结构顺序强烈依赖于初始配方及其在机械合金化处理后的分解。结果证实，在机械合金化10小时后有可能获得金属间化合物NiAl相。对于加工后的粉末混合物，结果表明WC含量的增加会加剧破碎和结构解体。在较低温度（800°C）和较高温度（1100°C）下制备的烧结体的最终结构由再结晶的NiAl和WC相组成。在1100°C下获得的烧结体的宏观硬度从409 HV（NiAl）增加到1800 HV（NiAl + 90% WC）。所得结果揭示了金属间化合物基复合材料领域的一个新的应用前景，并对其在严重磨损或高温条件下的可能应用仍抱有很高期望。
