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<p>The limited mechanical strength of pure nickel (Ni) restricts its use in high-stress applications, hence necessitating strategies for enhancement. This study incorporated titanium carbide (TiC) as a reinforcement to improve the mechanical properties of Ni and to act as a grain refiner to promote isotropic microstructural behaviour. Samples of pure Ni and Ni-10wt%TiC were manufactured by laser powder bed fusion. Optimised parameters achieved a highly dense Ni-10wt%TiC composite with only 0.04% porosity. The original pure Ni exhibited an anisotropic microstructure with large grain size and texture variations along the build directions. However, the addition of the 10 wt.% TiC refined the grain structure and introduced a more random texture, leading to improved isotropy in the microstructure. The hardness of pure Ni increased by 133%, while the yield strength and the ultimate tensile strength increased by 112% and 132% respectively. This was accompanied by a reduction in the elongation of 36%. This improvement in the strength properties is attributed to the strengthening mechanisms achieved with the TiC particle dispersion within the Ni matrix.</p>

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Enhancing isotropic microstructural and mechanical properties of laser powder bed fusion-fabricated pure nickel through TiC reinforcement

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Polline Mwambe,
  • Natasha Sacks

摘要

The limited mechanical strength of pure nickel (Ni) restricts its use in high-stress applications, hence necessitating strategies for enhancement. This study incorporated titanium carbide (TiC) as a reinforcement to improve the mechanical properties of Ni and to act as a grain refiner to promote isotropic microstructural behaviour. Samples of pure Ni and Ni-10wt%TiC were manufactured by laser powder bed fusion. Optimised parameters achieved a highly dense Ni-10wt%TiC composite with only 0.04% porosity. The original pure Ni exhibited an anisotropic microstructure with large grain size and texture variations along the build directions. However, the addition of the 10 wt.% TiC refined the grain structure and introduced a more random texture, leading to improved isotropy in the microstructure. The hardness of pure Ni increased by 133%, while the yield strength and the ultimate tensile strength increased by 112% and 132% respectively. This was accompanied by a reduction in the elongation of 36%. This improvement in the strength properties is attributed to the strengthening mechanisms achieved with the TiC particle dispersion within the Ni matrix.