Add time:07/23/2019         Source:sciencedirect.com

High-pressure strengthening is reported to be an effective approach to strengthen materials in addition to traditional nanocrystalline strengthening. Numerous studies have proven that high pressure is an important factor for improving the mechanical properties of materials. Here, we sintered high-purity sub-micron Tungsten carbide (cas 11130-73-7) (sm-WC) ceramics without any additives under a high pressure of 10 GPa and temperatures ranging from 1000 °C to 1500 °C. Numerous microdefects (stacking faults and twins) were introduced inside the grains, and the Vickers hardness of the well-sintered WC bulks reached a high value of 33 GPa, which could be compared with that of single crystal and nanocrystalline counterparts. Thus, the high-pressure strengthening can be applied to the WC system and improves the mechanical properties. The strengthening mechanism is that the high pressure can make the grains take place bulk yield, promote a severe plastic deformation, and introduce numerous microdefects. These defects act as obstacles against dislocations glide during deformation, and thus improve the mechanical properties.

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