This PDF file includes:

• Supplementary Text
• Fig. S1. Fabrication of Cu-containing WC nanoparticles.
• Fig. S2. Cooling curves for furnace cooling, air cooling, and water quenching of Cu-WC samples.
• Fig. S3. Size distribution of WC nanoparticles in the as-solidified Cu-WC sample.
• Fig. S4. Structure of bulk UFG/nanocrystalline Cu-containing WC nanoparticles.
• Fig. S5. STEM image of the WC nanoparticle-rich area showing that the Cu grain size is correlated with WC interparticle spacing.
• Fig. S6. Cooling curve during the DSC tests at a cooling rate of 5°C/min.
• Fig. S7. Mechanical properties of UFG/nanocrystalline Cu-containing WC nanoparticles.
• Fig. S8. Undercooling profile relative to solid fraction.
• References (39–45)

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