Fig. 4: The transformation from μ can lead to either the P or the σ phase.

a The projected atomic arrangement of μ phase with one FTB; the FTB is marked with orange dotted line, both sides of the FTB are the perfect structure of μ phase with seven nonequivalent (110) layers. The thickness of the seven layers is defined as block D. The purple and blue atoms represent (Co, Cr, Ni) and (W, Mo, Re), respectively. After the transformation displayed in Figs. 2 and 3, a changes to the partial structure of P (or σ) phase (marked with framed boxes) in (b, c). The yellow atoms are the extra row of atoms that have diffused in. d The atomic arrangement showing two FTBs of μ phase with a spacing of D (between the two orange dashed lines). e, f The model and corresponding experimental HAADF image of defects in (d) after transformation, and the part in the dashed boxes are the complete intergrowth σ phase projected along [011]_σ. g The atomic arrangement of two FTBs of μ phase with a spacing of 2D. h, i The model and corresponding HAADF image of defects in (g) after transformation, where the region inside the dashed boxes are the complete intergrowth P phase projected along [011]_P. The HAADF image simulation of each structures are included as overlaid insets in (c, f, i), respectively.