Fig. 1: Microstructure analysis.
From: Strong and ductile high temperature soft magnets through Widmanstätten precipitates
a Calculated equilibrium phase diagram of the Fe35Co30Ni30Ta5 (at%) alloy using the thermodynamics software Thermo-Calc (see “Methods”). The D0a structure is an ordered D019 structure based on a hexagonal crystal lattice. The black dashed line indicates the chosen isothermal annealing temperature (1173 K). b XRD patterns (measured and simulated). The inset shows the enlarged segment between 45° and 60° (black dashed frame). c ECCI analysis showing the microscale Widmanstätten-patterned precipitates. d TKD phase map showing the identified phases. The yellow frame refers to the region shown in (e) and Fig. S1c. e DF-TEM image taken using D019 reflection (Fig. S1d). f Atomic-resolution STEM micrograph showing the incoherent phase boundary. Left side, fcc matrix; Right side, D019 precipitates. g Corresponding FFT pattern. Red, fcc matrix, green, D019 precipitates. h An APT sample before sharpening showing the 3D plate-shaped precipitates. i Reconstructed the APT map showing the elemental distributions. The interface is highlighted with 25 at% Fe. The plane view (right-top corner) shows a 2.5 nm-thick cross-sectional slice from the tip. j 1D compositional profiles along the arrow marked in the plane view. The error bars are estimated as described in Methods.
