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<p>Polycrystalline Ni-based superalloys rely on compositional modifications for high-temperature, structural aerospace applications. However, these changes must be carefully managed to avoid deleterious phases. While the individual effects of Ti and Ta are well documented, their synergistic co-addition has received limited attention in high Co-containing alloys. This study investigates the influence of Ti and Ta on the load partitioning behavior between the <i>γ</i> and <i>γ</i>′ phases using&#xa0;<i>in situ</i>&#xa0;synchrotron diffraction under tensile loads in the temperature range from 600&#xa0;°C to 800&#xa0;°C. Our findings show that the ratio of Ti:Ta directly impacts how load is distributed, with a higher ratio leading to a greater load-carrying capacity in the <i>γ</i>′ phase, thereby improving strength at intermediate temperatures (700&#xa0;°C). However, this benefit seems thermally limited, coinciding with a significant reduction in stiffness in the high-Ti alloy at 800&#xa0;°C. Conversely, a balanced Ti:Ta ratio maintains consistent load partitioning and strength stability across the entire temperature range. By linking lattice misfit and stiffness evolution to bulk behavior, this work identifies load transfer efficiency as a critical metric for the design of future high-performance superalloys. By understanding this relationship, the compositional limits for optimizing alloy performance in service can be better defined. This work highlights a critical design pathway for future high-performance superalloys by demonstrating the link between controlled alloying, lattice misfit, and load partitioning.</p>

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In Situ X-ray Characterization of Thermomechanical Deformation Behavior in Powder-Processed Polycrystalline High Co-Containing Ni-Based Superalloys

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月16日

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  • Frances E. Synnott,
  • Lewis R. Owen,
  • Nicholas G. Jones,
  • Howard J. Stone,
  • David Dye,
  • Paul M. Mignanelli,
  • Mark Hardy,
  • Katerina A. Christofidou

摘要

Polycrystalline Ni-based superalloys rely on compositional modifications for high-temperature, structural aerospace applications. However, these changes must be carefully managed to avoid deleterious phases. While the individual effects of Ti and Ta are well documented, their synergistic co-addition has received limited attention in high Co-containing alloys. This study investigates the influence of Ti and Ta on the load partitioning behavior between the γ and γ′ phases using in situ synchrotron diffraction under tensile loads in the temperature range from 600 °C to 800 °C. Our findings show that the ratio of Ti:Ta directly impacts how load is distributed, with a higher ratio leading to a greater load-carrying capacity in the γ′ phase, thereby improving strength at intermediate temperatures (700 °C). However, this benefit seems thermally limited, coinciding with a significant reduction in stiffness in the high-Ti alloy at 800 °C. Conversely, a balanced Ti:Ta ratio maintains consistent load partitioning and strength stability across the entire temperature range. By linking lattice misfit and stiffness evolution to bulk behavior, this work identifies load transfer efficiency as a critical metric for the design of future high-performance superalloys. By understanding this relationship, the compositional limits for optimizing alloy performance in service can be better defined. This work highlights a critical design pathway for future high-performance superalloys by demonstrating the link between controlled alloying, lattice misfit, and load partitioning.