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<p>The energy efficiency of heat engines (gas and steam turbines) for electricity production and propulsion is determined by the Carnot cycle and scales with operating temperature. Commercial nickel- and cobalt-based superalloys melt near 1,500 °C and rapidly lose mechanical strength beyond 1,000 °C. Refractory metals melt well above 2,000 °C but have inherent manufacturability challenges that are barriers to adoption, such as high ductile-to-brittle transition temperatures. Using density functional theory-guided design, we demonstrate tailored local lattice distortions that promote phase-stable, non-equiatomic refractory concentrated solid solutions with both high ductility and strength. We exemplify this for single-phase, body-centred cubic Nb<sub>4</sub>Ta<sub>4</sub>V<sub>3</sub>Ti that exhibits castability, excellent room-temperature tensile yield strength (∼1 GPa) and ductility (approaching 20% uniform strain), and exceptional high-temperature tensile strength (500 MPa at 1,000 °C). These findings illustrate a path for designing materials that hold great potential for advancing next-generation technologies such as Generation IV fission reactors, first-generation fusion-plasma reactors, and more efficient gas turbines for electricity generation and propulsion.</p>

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Achieving high tensile strength and ductility in refractory alloys by tuning electronic structure

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Hailong Huang,
  • Prashant Singh,
  • Duane D. Johnson,
  • Dishant Beniwal,
  • Pratik K. Ray,
  • Gaoyuan Ouyang,
  • Luke Gaydos,
  • Trevor Riedemann,
  • Tirthesh Ingale,
  • Vishal Soni,
  • Rajarshi Banerjee,
  • Thomas W. Scharf,
  • Ping Lu,
  • Frank W. DelRio,
  • Andrew B. Kustas,
  • John A. Sharon,
  • Ryan Deacon,
  • Syed I. A. Jalali,
  • Michael Patullo,
  • Sharon Park,
  • Kevin J. Hemker,
  • Ryan T. Ott,
  • Nicolas Argibay

摘要

The energy efficiency of heat engines (gas and steam turbines) for electricity production and propulsion is determined by the Carnot cycle and scales with operating temperature. Commercial nickel- and cobalt-based superalloys melt near 1,500 °C and rapidly lose mechanical strength beyond 1,000 °C. Refractory metals melt well above 2,000 °C but have inherent manufacturability challenges that are barriers to adoption, such as high ductile-to-brittle transition temperatures. Using density functional theory-guided design, we demonstrate tailored local lattice distortions that promote phase-stable, non-equiatomic refractory concentrated solid solutions with both high ductility and strength. We exemplify this for single-phase, body-centred cubic Nb4Ta4V3Ti that exhibits castability, excellent room-temperature tensile yield strength (∼1 GPa) and ductility (approaching 20% uniform strain), and exceptional high-temperature tensile strength (500 MPa at 1,000 °C). These findings illustrate a path for designing materials that hold great potential for advancing next-generation technologies such as Generation IV fission reactors, first-generation fusion-plasma reactors, and more efficient gas turbines for electricity generation and propulsion.