Lattice‐Distortion‐Enhanced Yield Strength in a Refractory High‐Entropy Alloy

• DOI: 10.1002/adma.202004029
• Publication Date: 2020-11-02T08:46:40Z
• Authors: Chanho Lee; Yi Chou; George Kim; Michael C. Gao; Ke An; Jamieson Brechtl; Chuan Zhang; Wei Chen; Jonathan D. Popla...; Gian Song; Yang Ren; Yi‐Chia Chou; Peter K. Liaw
• Keywords: High-Entropy Alloys; Refractory metals; Lattice (music)

Abstract Severe distortion is one of the four core effects in single‐phase high‐entropy alloys (HEAs) and contributes significantly to yield strength. However, connection between atomic‐scale lattice macro‐scale mechanical properties through experimental verification has yet be fully achieved, owing two critical challenges: 1) difficulty development homogeneous solid‐solution HEAs 2) ambiguity describing related measurements calculations. A body‐centered‐cubic (BCC) refractory HEA, NbTaTiVZr, using thermodynamic modeling coupled with verifications, developed. Compared previously developed NbTaTiV NbTaTiVZr HEA shows a higher strength comparable plasticity. The increase systematically quantitatively studied terms theoretical model, first‐principles calculations, synchrotron X‐ray/neutron diffraction, atom‐probe tomography, scanning transmission electron microscopy techniques. These results demonstrate that severe factor for developing high strengths HEAs.