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<p>This study addresses the effect of aluminizing a previously deposited NiCoCrAlY coating and a Ni-base superalloy, using a single-step high temperature high-activity (HTHA) process. A significant inward diffusion of Al and outward diffusion of Ni, Cr, Co, and Fe was observed. This lead to the formation of aluminized layers of up to 550&#xa0;<i>μ</i>m thickness after 6 hours at 1000&#xa0;°C. Microstructural and chemical characterization identified two layers, an inner layer primarily composed of the AlNi phase and an outer layer composed of Al-rich phases. Here, we report the formation of the Al<sub>13</sub>TM<sub>4</sub> (TM = Ni, Fe, Co) phase in an aluminizing process, concluding that the high Al activity in the pack mixture and the presence of Co (and Fe) favored the stabilization of the this phase.</p>

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A Primal Characterization of the Al13TM4 Phase Obtained in a Single-Step High-Activity Aluminized MCrAlY Coating

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Santiago Maya-Johnson,
  • Ana Sofia C. M. d’Oliveira

摘要

This study addresses the effect of aluminizing a previously deposited NiCoCrAlY coating and a Ni-base superalloy, using a single-step high temperature high-activity (HTHA) process. A significant inward diffusion of Al and outward diffusion of Ni, Cr, Co, and Fe was observed. This lead to the formation of aluminized layers of up to 550 μm thickness after 6 hours at 1000 °C. Microstructural and chemical characterization identified two layers, an inner layer primarily composed of the AlNi phase and an outer layer composed of Al-rich phases. Here, we report the formation of the Al13TM4 (TM = Ni, Fe, Co) phase in an aluminizing process, concluding that the high Al activity in the pack mixture and the presence of Co (and Fe) favored the stabilization of the this phase.