Influence of electropulsing globularization on the microstructure and mechanical properties of Ti-6A1-4V alloy strip with lamellar microstructure

摘要

The effect of high-energy electropulsing treatment (EPT) on the microstructure and mechanical properties of Ti-6A1-4V alloy strip with initial lamellar microstructure was investigated. The results indicated that EPT accelerated the phase change process tremendously inducing equiaxed microstructure in titanium alloy. The EPT-induced microstructural change resulted in remarkably increasing elongation-to-failure while the tensile strength remained unchanged. A mechanism for rapid phase change in low temperature during EPT was proposed based on the reduction of nucleation thermo-dynamic barrier and enhancement of atomic diffusion. A medium migration model was utilized for discussing the globularization process.