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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy.

Chanho Lee1,2, Yi Chou3, George Kim4

  • 1Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996-2100, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 2, 2020
PubMed
Summary

Severe lattice distortion in refractory high-entropy alloys (HEAs) significantly boosts yield strength. This study experimentally verifies this link in NbTaTiVZr, a new single-phase BCC HEA, confirming distortion as key to high strength.

Keywords:
NbTaTiVZralloy-design strategieslattice distortionmicrostructurerefractory high-entropy alloysyield strength

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Physics

Background:

  • Severe lattice distortion is a key factor influencing mechanical properties in single-phase high-entropy alloys (HEAs).
  • Experimental verification of the link between atomic-scale distortion and macro-scale properties in HEAs is challenging due to difficulties in developing homogeneous alloys and quantifying distortion.
  • Refractory HEAs offer potential for high-temperature applications but require optimization of their mechanical behavior.

Purpose of the Study:

  • To develop a homogeneous single-phase body-centered-cubic (BCC) refractory high-entropy alloy (HEA).
  • To experimentally investigate and quantitatively link atomic-scale lattice distortion to the enhanced yield strength of the developed HEA.
  • To demonstrate the critical role of severe lattice distortion in achieving high strength in refractory HEAs.

Main Methods:

  • Thermodynamic modeling and experimental synthesis to develop the NbTaTiVZr single-phase BCC HEA.
  • Synchrotron X-ray/neutron diffraction, atom-probe tomography, and scanning transmission electron microscopy for atomic-scale characterization.
  • Theoretical modeling and first-principles calculations to quantify lattice distortion and its effect on mechanical properties.

Main Results:

  • Successfully developed a homogeneous single-phase BCC refractory HEA, NbTaTiVZr.
  • NbTaTiVZr exhibited higher yield strength compared to the NbTaTiV HEA, with comparable plasticity.
  • Quantitative analysis confirmed that severe lattice distortion is the primary contributor to the increased yield strength.

Conclusions:

  • Severe lattice distortion is a fundamental mechanism for enhancing yield strength in single-phase refractory HEAs.
  • The developed NbTaTiVZr alloy serves as a model system for studying distortion-property relationships.
  • This work provides experimental validation for the significant role of lattice distortion in HEA strengthening.