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Superior High-Temperature Strength in a Supersaturated Refractory High-Entropy Alloy.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Physics

Background:

  • Refractory high-entropy alloys (RHEAs) offer potential for high-temperature applications.
  • A significant challenge in RHEAs is maintaining high strength at elevated temperatures (above 1173 K) due to heat softening.

Purpose of the Study:

  • To design a single-phase body-centered-cubic (BCC) CrMoNbV RHEA with superior high-temperature strength.
  • To elucidate the fundamental mechanisms responsible for the alloy's elevated-temperature strength retention.

Main Methods:

  • Alloy design based on intrinsic material characteristics and solid-solution strengthening principles.
  • Experimental characterization using in situ neutron scattering and transmission electron microscopy (TEM).
  • Theoretical analysis employing first-principles calculations.

Main Results:

  • A CrMoNbV RHEA was successfully designed, exhibiting strengths exceeding 1000 MPa at 1273 K.
  • This strength surpasses that of previously reported RHEAs and conventional superalloys.
  • Key strengthening mechanisms identified include large atomic-size/elastic-modulus mismatches, temperature-insensitive elastic constants, and pronounced solid-solution strengthening due to solute pinning of dislocations.

Conclusions:

  • The developed alloy-design principles enable the creation of RHEAs with outstanding high-temperature strength.
  • Understanding the strengthening mechanisms provides a pathway for future high-performance alloy development for extreme environments.