. And the f was larger and the fracture
stress was lower in specimen B than those in specimen A. According
to Eq. (1), the tensile force F would be lower in specimen B
when the crack initiated during the tensile deformation, leading to
the lower UTS in specimen B. According to these shown in
Figs. 2 and 9, as the slow shot speed decreased, f would become
larger because of the larger and more complex porosity could exist
in defect band, and the fracture stress would become lower because
of the larger and more dendritic ESCs. Thus, with a lower
tensile force F, the crack would occur in the specimen at a lower
slow shot speed, leading to the decreased UTS of specimen with
the decreased slow shot speed.