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Small-Scale Insight into Uniform Deformability and Softening Resistance of Refractory High-Entropy Alloy.

Cheng-Yuan Tsai1, Wen-Ju Chen1, Yuan-Tao Hsu1

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This study investigated refractory high-entropy alloys (HEAs), finding that increased complexity enhances strength and work hardening by altering dislocation behavior. These BCC-structured alloys show reduced anisotropy and sustained high-temperature performance.

Keywords:
High-entropy alloysdislocation activitylattice distortionplasticitysimulation

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Refractory high-entropy alloys (HEAs) with BCC structures offer excellent softening resistance and thermal stability.
  • Understanding their deformation mechanisms is crucial for advanced applications.

Purpose of the Study:

  • To investigate the mechanical properties and deformation behaviors of W-based HEAs.
  • To analyze the evolution of dislocation structures under varying temperatures and orientations.
  • To correlate microstructural changes with macroscopic mechanical responses.

Main Methods:

  • Nanoindentation and microcompression tests were performed at different temperatures.
  • Transmission Electron Microscopy (TEM) was used for post-mortem analysis of defect structures.
  • Atomistic simulations were employed to model dislocation populations and their dynamics.

Main Results:

  • W-based HEAs demonstrated reduced elastic and plastic anisotropy while maintaining high-temperature strength.
  • Increasing compositional complexity shifted deformation from planar slip to homogeneous flow.
  • Severe lattice distortion facilitated dislocation nucleation but hindered long-range glide.

Conclusions:

  • Cooperative edge and screw dislocation activity sustains strength and work hardening in HEAs across temperatures.
  • Lattice distortion plays a key role in controlling dislocation mobility and alloy performance.
  • These findings provide insights into designing high-performance refractory HEAs.