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<p>In this study, cobalt coated alumina (Co@Al<sub>2</sub>O<sub>3</sub>) particles were prepared via the electroless plating process, and mixed with CoCrMo alloy powders in the proportion of 0.5–2&#xa0;wt%. The Co@Al<sub>2</sub>O<sub>3</sub>/CoCrMo composites were then manufactured by selective laser melting (SLM) process. The microstructure, texture, wear resistance performance and mechanical property of the composites were characterized. By increasing the content of Co@Al<sub>2</sub>O<sub>3</sub> particles from 0 to 1.0&#xa0;wt%, a martensitic transformation from the <i>γ</i> phase to <i>ε</i> phase occurred, while the composites kept flawless with the lowest wear rate of 2.07&#xa0;×&#xa0;10<sup>–5</sup>&#xa0;mm<sup>3</sup>&#xa0;N<sup>−1</sup>&#xa0;m<sup>−1</sup> and the highest ultimate tensile strength (UTS) of 1251.93&#xa0;MPa. When the content of Co@Al<sub>2</sub>O<sub>3</sub> particles increased further, both the wear rate and UTS of composites deteriorated unexpectedly, it is ascribed to the micrometer-scale pores from the gasification of organic matter in Co@Al<sub>2</sub>O<sub>3</sub> particles during the SLM process, which have become the location of crack initiation and propagation.</p> Graphical abstract <p></p>

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Microstructure and mechanical behavior of Co@Al2O3/CoCrMo composites prepared by SLM technology

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Wei Liu,
  • Lehui Zhang,
  • Ruifeng Zhao,
  • Yuxin Li

摘要

In this study, cobalt coated alumina (Co@Al2O3) particles were prepared via the electroless plating process, and mixed with CoCrMo alloy powders in the proportion of 0.5–2 wt%. The Co@Al2O3/CoCrMo composites were then manufactured by selective laser melting (SLM) process. The microstructure, texture, wear resistance performance and mechanical property of the composites were characterized. By increasing the content of Co@Al2O3 particles from 0 to 1.0 wt%, a martensitic transformation from the γ phase to ε phase occurred, while the composites kept flawless with the lowest wear rate of 2.07 × 10–5 mm3 N−1 m−1 and the highest ultimate tensile strength (UTS) of 1251.93 MPa. When the content of Co@Al2O3 particles increased further, both the wear rate and UTS of composites deteriorated unexpectedly, it is ascribed to the micrometer-scale pores from the gasification of organic matter in Co@Al2O3 particles during the SLM process, which have become the location of crack initiation and propagation.

Graphical abstract