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<p>In this study, Al<sub>2</sub>O<sub>3P</sub>/CrCoNi nanocomposites were successfully synthesized using two distinct sintering techniques: rapid spark plasma sintering (SPS) and hot pressing sintering (HPS). Effects of these sintering methods on the microstructure and mechanical properties of the composites were extensively investigated using various techniques, including x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and an electronic universal material testing machine. Results indicate that 2.5&#xa0;wt.% Al<sub>2</sub>O<sub>3P</sub>/CrCoNi composites prepared by SPS and HPS are composed of an FCC phase, Cr<sub>23</sub>C<sub>6</sub>, and <i>α</i>-Al<sub>2</sub>O<sub>3</sub>; both sintering methods obtained composites with a relative density of ≥ 96.7% and a uniform distribution of Al<sub>2</sub>O<sub>3</sub> reinforcement phases. However, compared with samples prepared by HPS, the hardness of the CrCoNi matrix and composites synthesized via SPS increased by 23.1% and 16.1%, respectively. Meanwhile, their compressive yield strength was enhanced by 405 and 1044&#xa0;MPa, respectively. Improvement of SPSed materials in hardness and yield strength is mainly attributed to grain refinement strengthening. This provides experimental reference and theoretical guidance for designing and preparing high/medium-entropy alloy composites with various mechanical properties.</p>

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Effects of Fabrication Process on Microstructure and Properties of Al2O3P/CrCoNi Medium-Entropy Alloy Matrix Composites

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Aiwu Zhao,
  • Xian Luo,
  • Lei Qu,
  • Jincai Dai,
  • Xiang Guo,
  • Yanqing Yang

摘要

In this study, Al2O3P/CrCoNi nanocomposites were successfully synthesized using two distinct sintering techniques: rapid spark plasma sintering (SPS) and hot pressing sintering (HPS). Effects of these sintering methods on the microstructure and mechanical properties of the composites were extensively investigated using various techniques, including x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and an electronic universal material testing machine. Results indicate that 2.5 wt.% Al2O3P/CrCoNi composites prepared by SPS and HPS are composed of an FCC phase, Cr23C6, and α-Al2O3; both sintering methods obtained composites with a relative density of ≥ 96.7% and a uniform distribution of Al2O3 reinforcement phases. However, compared with samples prepared by HPS, the hardness of the CrCoNi matrix and composites synthesized via SPS increased by 23.1% and 16.1%, respectively. Meanwhile, their compressive yield strength was enhanced by 405 and 1044 MPa, respectively. Improvement of SPSed materials in hardness and yield strength is mainly attributed to grain refinement strengthening. This provides experimental reference and theoretical guidance for designing and preparing high/medium-entropy alloy composites with various mechanical properties.