Ti555211合金双态组织拉伸行为的SEM原位观察

The tensile deformation and fracture behavior of the Ti555211 alloy with dual structure were investigated using in-situ SEM technology. Results show that slip bands are given priority within the primary α phase along with angle of 45^o with the tensile loading direction for the Ti555211 alloy with initial dual structure. As the crack propagates, the density of the slip bands increases. Moreover, the crack growth is dominated by interconnected microcavities for the alloy with initial dual structure. The Ti555211 alloy with initial dual structure and lamellar structure show different fracture morphologies. For the alloy with initial dual structure, there display a small flat surface caused by shear slip, but no obvious shear lip occurs in fracture. The deformation and fracture behavior of the near-β titanium alloy of Ti555211 can be tracked by the SEM in-situ tensile test method in real time. The research results of this method have great theoretical value and engineering significance.