Comparing with the dense microstructure around the gas pore
and gas-shrinkage pore (see Fig. 4a and d), the microstructure
around the shrinkage pore was coarse because of the existence of
large and dendritic ESCs (Fig. 4g). In this respect, the fracture
stress of the microstructure around shrinkage pore was lower than
that around gas pore and gas-shrinkage pore. On the other hand,
because of the complex morphology of shrinkage pore, the stress