Abstract This work investigates the effect of Al2O3 and ZrO2 addition on microstructure and mechanical properties of Ni based functionally graded composites (FGCs). The cylindrical pellets of different compositions of three layered FGCs were prepared through mechanical alloying followed by compaction and conventional sintering. The sintering was conducted at 1200 °C for 90 min under vacuum atmosphere. Microstructure, hardness and flexural strength of the samples were examined and comparisons were made between Al2O3 and ZrO2 alloying. The FGCs with alloying of Al2O3 along with ZrO2 shows the highest hardness of 258.1 HV0.05. The flexural strength of FGCs improved to 18% by combined alloying of Al2O3 and ZrO2. The homogeneous dispersion of refined powder particles and precipitation of Al–Zr–O oxides appears to be responsible for the improved properties of Ni based FGCs.

中文翻译：

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Al2O3和ZrO2合金化对真空烧结Ni基功能梯度复合材料组织、硬度和弯曲强度的影响

摘要 本工作研究了Al2O3 和ZrO2 添加对Ni 基功能梯度复合材料(FGCs) 微观结构和力学性能的影响。通过机械合金化、压制和常规烧结制备了不同成分的三层 FGC 的圆柱形球团。烧结在真空气氛下在 1200°C 下进行 90 分钟。对样品的显微组织、硬度和弯曲强度进行了检查，并对 Al2O3 和 ZrO2 合金化进行了比较。具有 Al2O3 和 ZrO2 合金化的 FGC 显示出最高硬度 258.1 HV0.05。通过 Al2O3 和 ZrO2 的联合合金化，FGC 的弯曲强度提高到 18%。