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<p>To investigate the mechanism by which oxidation-resistant coatings influence the mechanical properties of high-temperature titanium alloys and titanium matrix composite sheets, we employed High-Velocity Oxygen Fuel (HVOF) spraying to deposit NiCrAlY coatings on Ti65 and MTi650A thin sheets. The mechanical properties of these sheets were evaluated through tensile tests at room temperature, while their microstructures were analyzed using optical microscopy (OM) and scanning electron microscopy (SEM). The experimental results demonstrated that the spray coating process caused a significant decrease in the mechanical properties of both Ti65 and MTi650A. Specifically, the ultimate tensile strength (UTS) of Ti65 decreased by 158&#xa0;MPa, accompanied by a substantial reduction of 55% in elongation after fracture. In comparison, MTi650A exhibited much less degradation, with only a 27&#xa0;MPa reduction in UTS and a 9.4% decrease in elongation. Microstructural analysis revealed that the formation of defects induced on the substrate surface during the spray coating process was the primary factor responsible for the diminished tensile strength and elongation observed in both materials. In contrast, MTi650A exhibits fewer defects post-spraying due to the presence of the TiB reinforcement phase, which contributes to its superior mechanical performance. Furthermore, the <i>α</i> lamellar structural units within the substrate, oriented differently, alter crack propagation paths, thereby mitigating the coating’s influence on mechanical properties. However, locally aggregated reinforcement phases can somewhat accelerate crack propagation during tension.</p>

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The influence mechanism of NiCrAlY coatings on the mechanical properties of high-temperature titanium alloys and titanium matrix composite thin sheets

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Chong Ling,
  • Yingying Liu,
  • Chun Wang,
  • Yanjin Xu,
  • Shuming Zhang,
  • Hong Qiao,
  • Fuxin Wang

摘要

To investigate the mechanism by which oxidation-resistant coatings influence the mechanical properties of high-temperature titanium alloys and titanium matrix composite sheets, we employed High-Velocity Oxygen Fuel (HVOF) spraying to deposit NiCrAlY coatings on Ti65 and MTi650A thin sheets. The mechanical properties of these sheets were evaluated through tensile tests at room temperature, while their microstructures were analyzed using optical microscopy (OM) and scanning electron microscopy (SEM). The experimental results demonstrated that the spray coating process caused a significant decrease in the mechanical properties of both Ti65 and MTi650A. Specifically, the ultimate tensile strength (UTS) of Ti65 decreased by 158 MPa, accompanied by a substantial reduction of 55% in elongation after fracture. In comparison, MTi650A exhibited much less degradation, with only a 27 MPa reduction in UTS and a 9.4% decrease in elongation. Microstructural analysis revealed that the formation of defects induced on the substrate surface during the spray coating process was the primary factor responsible for the diminished tensile strength and elongation observed in both materials. In contrast, MTi650A exhibits fewer defects post-spraying due to the presence of the TiB reinforcement phase, which contributes to its superior mechanical performance. Furthermore, the α lamellar structural units within the substrate, oriented differently, alter crack propagation paths, thereby mitigating the coating’s influence on mechanical properties. However, locally aggregated reinforcement phases can somewhat accelerate crack propagation during tension.