Fig. 2: Aberration-corrected TEM imaging and mapping of element distributions in the Zr₁₆Nb₁₄Hf₂₂Ta₂₃Mo₂₅ and Zr₁₅Nb₁₄Hf₂₂Ta₂₂Mo₂₄Pt₃ HEAs, respectively.

a–d Atomic-resolution HAADF image of Zr₁₆Nb₁₄Hf₂₂Ta₂₃Mo₂₅ HEA and the corresponding atomic strain maps of horizontal normal strain (ε_xx), vertical normal strain (ε_yy) and shear strain (ε_yx), suggesting the severe lattice distortion. e The inverse FFT (IFFT) image, corresponding to the area of the yellow square in (a) suggests the Burgers circuit encircling the dislocation (marked as “⊥”, the atoms involved are marked with yellow circles). f HAADF image of the atomic structure of Zr₁₆Nb₁₄Hf₂₂Ta₂₃Mo₂₅ HEA, taken with the \([\bar{1}11]\) zone axis, and the EDS maps for individual elements of Zr, Nb, Hf, Ta and Mo, manifesting the relatively homogeneous distribution of each constituent element. g For Zr₁₅Nb₁₄Hf₂₂Ta₂₂Mo₂₄Pt₃ HEA, elemental EDS map of five constituent elements (Zr, Nb, Hf, Ta, Mo), the individual EDS map of Pt element, and elemental EDS map of Zr and Pt elements in the same location. The ordered atomic arrangement marked by white squares is always located at the Pt-free region while the disordered groups marked by yellow circles are closely linked to the appearance of Pt atoms; the small white circles also reveal the existence of ordered clusters. Pt and Zr atoms tend to appear in the same position, indicating the formation of Pt–Zr-enriched disordered groups. h The EDS maps with larger magnification for individual elements of Zr, Nb, Hf, Ta, Mo, and Pt. The white squares represent the Pt–Zr-depleted ordered areas.