To study the effects of the cooling rate, Cu-WC samples were melted again at 1250°C under argon gas protection and then cooled down in furnace, air, and water. The cooling rate was measured with a K-type thermocouple connected to an Arduino Uno board to record the cooling curve. The thermocouple was located at the center of the melt. The measured cooling rates of furnace cooling, air cooling, and water quenching are 2 to 4, 7 to 12, and 70 to 100 K/s, respectively. The typical cooling curves are shown in fig. S2, and the thermal arrest caused by the solidification of Cu is identified in the furnace and air cooling curve but is not obvious in the water quenching curve due to the rapid heat dissipation.

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