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<p>This study reports on the fabrication of a nano-TiC/TiB<sub>2</sub>-reinforced composite using an intermediate alloy method to enhance the high-temperature mechanical properties of conventional superalloys. A base superalloy (analogous to Inconel 718) and two composites were synthesized. The composites were produced by reinforcing the base alloy with nano-TiC/TiB<sub>2</sub> particles at concentrations of 0.05&#xa0;wt.% and 0.1&#xa0;wt.%. These materials were processed into large-dimension forged bars via vacuum melting, electroslag remelting, homogenization, hot forging, and solution-aging treatments. The effects of the nanoparticle content on microstructure and high-temperature mechanical behavior were investigated, and the mechanisms of microstructural optimization, tensile strengthening, and wear resistance were clarified. Adding 0.05&#xa0;wt.% nanoparticles provided heterogeneous nucleation sites, refined grains, suppressed the formation of Laves phase, and promoted uniform secondary-phase precipitation relative to the base alloy. At 650&#xa0;℃, the 0.05&#xa0;wt.% composite showed 10.7% higher yield strength and 4.5% higher tensile strength, and its wear volume loss decreased by 35.3%. This work provides a useful approach for industrial production of ceramic-reinforced superalloy composites.</p>

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Study on microstructure and high-temperature mechanical behavior of nano-TiC/TiB2 duplex-reinforced nickel-based alloys

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Yong Shao,
  • Bin Shi,
  • Shaoqi Zhang,
  • Feng Qiu,
  • Cheng Liu,
  • Xiaocheng Lu,
  • Pingyi Guo

摘要

This study reports on the fabrication of a nano-TiC/TiB2-reinforced composite using an intermediate alloy method to enhance the high-temperature mechanical properties of conventional superalloys. A base superalloy (analogous to Inconel 718) and two composites were synthesized. The composites were produced by reinforcing the base alloy with nano-TiC/TiB2 particles at concentrations of 0.05 wt.% and 0.1 wt.%. These materials were processed into large-dimension forged bars via vacuum melting, electroslag remelting, homogenization, hot forging, and solution-aging treatments. The effects of the nanoparticle content on microstructure and high-temperature mechanical behavior were investigated, and the mechanisms of microstructural optimization, tensile strengthening, and wear resistance were clarified. Adding 0.05 wt.% nanoparticles provided heterogeneous nucleation sites, refined grains, suppressed the formation of Laves phase, and promoted uniform secondary-phase precipitation relative to the base alloy. At 650 ℃, the 0.05 wt.% composite showed 10.7% higher yield strength and 4.5% higher tensile strength, and its wear volume loss decreased by 35.3%. This work provides a useful approach for industrial production of ceramic-reinforced superalloy composites.