Fig. 2: Microstructure of B10 RMEA.
a–c Dark-field image and the SAED patterns show a dual-phase structure of BCC solid solution and M3B2 ceramic boride in B10 RMEA. d–h HRTEM image and the corresponding FFT and IFFT images indicate an ordered structure near the PBs. The magenta circles in image g indicate superlattice spots. Three-dimensional APT analysis reveals i–k the B-rich clusters near the PB in the BCC phase, and l and m the uniform distribution of elements in M3B2 boride. n Schematic diagram of the GOPB, including ordered B occupation in boride, ordered B clusters near the PB, and completely disordered interstitial B atoms inside the BCC phase. The yellow and purple balls represent boron atoms and randomly distributed metal atoms (W, Ta, and V), respectively. Source data are provided as a Source Data file.
