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<p>Enhancing the oxidation resistance of Co-based superalloys by adding a high content of Cr, while simultaneously ensuring the stability of the <i>γ/γ′</i> phases, presents a significant challenge. This study evaluated the alloying potential of Co–30Ni–10Al–5V–4Ta using the CALPHAD method, revealing promising characteristics. The developed Co–30Ni–10Al–5V–4Ta–12Cr alloy characterized by high Cr content and <i>γ/γ′</i> two-phase structure, demonstrating high <i>γ′</i> solvus temperature of 1139°C, low density of 8.48 g/cm<sup>3</sup>, minimal <i>γ/γ′</i> lattice misfit of +0.28%, high compressive yield strength of 651 MPa at 800°C, and excellent oxidation resistance with a weight gain of 6.5 mg/cm<sup>3</sup> after 200 h at 1000°C. Examination of the oxidation behavior at 1000°C revealed an oxide layer consisting of a porous outer CoO, NiO, and V<sub>3</sub>O<sub>4</sub> (CNV) oxide and a denser inner mixed oxide layer comprising CoO, NiO, and V<sub>3</sub>O<sub>4</sub> (CNV) oxide, Al<sub>2</sub>O<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub>, CoO, and NiO (CNAC) oxide, and TaO<sub>2</sub>, CoO, and NiO (CNT) oxide.</p>

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Development and characterization of a high-Cr-content Co–Ni–Al–V–Ta–Cr superalloy: Microstructure, mechanical properties and oxidation resistance

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Xiang Yu,
  • Yuechao Chen,
  • Yong Lu,
  • Yihui Guo,
  • Jinbin Zhang,
  • Yixiong Huang,
  • Yupeng Zhang,
  • Jiajia Han,
  • Cuiping Wang,
  • Xingjun Liu

摘要

Enhancing the oxidation resistance of Co-based superalloys by adding a high content of Cr, while simultaneously ensuring the stability of the γ/γ′ phases, presents a significant challenge. This study evaluated the alloying potential of Co–30Ni–10Al–5V–4Ta using the CALPHAD method, revealing promising characteristics. The developed Co–30Ni–10Al–5V–4Ta–12Cr alloy characterized by high Cr content and γ/γ′ two-phase structure, demonstrating high γ′ solvus temperature of 1139°C, low density of 8.48 g/cm3, minimal γ/γ′ lattice misfit of +0.28%, high compressive yield strength of 651 MPa at 800°C, and excellent oxidation resistance with a weight gain of 6.5 mg/cm3 after 200 h at 1000°C. Examination of the oxidation behavior at 1000°C revealed an oxide layer consisting of a porous outer CoO, NiO, and V3O4 (CNV) oxide and a denser inner mixed oxide layer comprising CoO, NiO, and V3O4 (CNV) oxide, Al2O3, Cr2O3, CoO, and NiO (CNAC) oxide, and TaO2, CoO, and NiO (CNT) oxide.