Fig. 2: | Nature Communications

Fig. 2

From: High-entropy high-hardness metal carbides discovered by entropy descriptors

Fig. 2

Experimental results for high-entropy carbides synthesis and characterization. a Progression of a sample of HfNbTaTiVC5 through each processing step: hand mixing (magenta spectrum, bottom), ball milling (blue spectrum, center), and spark plasma sintering (green spectrum, top), depicting the evolution towards the desired rock-salt crystal structure (aexp = 4.42 Å). b Linear relationship between EFA−1 and the distortion of experimental lattice parameters ε. Green circles and red squares indicate homogeneous high-entropy single- and multi-phase compounds, respectively. c, d Electron micrographs of single-phase HfNbTaTiZrC5 and multi-phase HfMoTaWZrC5 specimens. e, f Selected EDS compositional maps of the HfNbTaTiZrC5 and HfMoTaWZrC5 specimens. The micrographs show the presence of the secondary phase in HfMoTaWZrC5 (circles) that is also present in XRD results, which is revealed to be a W- and Mo-rich phase. Scale bars, 10 μm (cf)