Figure 3
Distribution of grain/particle sizes and microstructures of WZC.
(a) High magnification BSE-SEM image showing the tungsten grains possess equiaxed structure. The black contrast dots correspond to the second phase particles. (b) Grain size distribution. (c,d) ZrC and W-Zr-Cx-Oy particles size distribution. (e) TEM images showing the formation of fine tungsten grain from PDWs transforming to PTBs during hot rolling process. (f) Dislocations interacting with intragranular nano particles, resulting in pinning and accumulation of dislocations inside the grain. (g) Some nano particles tightly bounding to the GBs could impede GB sliding. The intragranular particles (ZrC particles) are indicated by red solid arrows and intergranular ones (ZrC/ W-Zr-Cx-Oy particles) by red/blue open arrows. Note that the particles in the WZC are predominantly in the grain interior rather than at the grain boundaries.
