Fig. 1. Characterization of NbMoTaW alloy powder. (a) NbMoTaW powder morphology; (b) particle size distribution

Fig. 2. Schematics of test process. (a) Diagram of SLM process; (b) diagram of scanning strategy

Fig. 3. Forming and densification analysis results of (NbMoTaW)_100-xC_x sample. (a) Forming quality observed by optical microscope(OM); (b) forming quality observed by SEM; (c) 3D-CT result and pore volume distribution

Fig. 4. XRD pattern of (NbMoTaW)_100-xC_x RHEAs

Fig. 5. EBSD analysis and energy dispersive spectrometer (EDS) characterization results of (NbMoTaW)_100-xC_x RHEA^[24]. (a) Inverse pole figure (IPF) of (NbMoTaW)_99.5C_0.5; (b) IPF of NbMoTaW; (c) KAM and EDS images of (NbMoTaW)_99.5C_0.5 RHEA; (d) KAM and EDS images of NbMoTaW

Fig. 6. EBSD statistics results of (NbMoTaW)_100-xC_{xRHEA. (a) Grain size distribution; (b) grain boundary misorientation distribution;(c) kernel misorientation distribution}

Fig. 7. TEM characterization analysis results of (NbMoTaW)_100-xC_x samples^[24]. (a) TEM micrograph, TEM dark-field image, and corresponding SAED spots of NbMoTaW; (b) TEM micrograph, TEM dark-field image, and corresponding SAED spots of (NbMoTaW)_100-xC_x RHEA; (c) STEM morphology and EDS analysis result; (d) TEM image of (NbMoTaW)_99.5C_0.5 RHEA at grain boundary; (e) HRTEM image of (NbMoTaW)_99.5C_0.5 around dislocations; (f) HRTEM image of (NbMoTaW)_99.5C_0.5 at grain boundary

Fig. 8. Analysis and characterization of mechanical properties of (NbMoTaW)_100-xC_x sample. (a) Compressive stress-strain curves of (NbMoTaW)_100-xC_x RHEAs; (b) fracture morphology of NbMoTaW; (c) fracture morphology of (NbMoTaW)_99.5C_0.5

Fig. 9. XRD patterns of NbMoTaWTi_x RHEAs

Fig. 10. Microstructures of NbMoTaWTi_x RHEAs. (a) NbMoTaWTi_0.125; (b) NbMoTaWTi_0.250; (c) NbMoTaWTi_0.500

Fig. 11. EBSD (left) and EDS (right) analysis results of NbMoTaWTi_x RHEAs. (a) NbMoTaWTi_0.125; (b) NbMoTaWTi_0.250;

Fig. 12. Analysis and characterization of mechanical properties of NbMoTaWTi_x samples. (a) Compressive stress-strain curves of NbMoTaWTi_x RHEAs; (b) yield strength and compressive strain versus Ti atomic fraction