Analysis on Superplastic Tensile Deformation Behavior of Ti6Al4V Alloy in Lowtemperature Environment

The superplastic tensile deformation experiment of Ti6Al4V alloy without pretreatment was carried at low temperature(700~850 ℃) environment, the superplastic deformation ability and mechanical behavior were analyzed, and the low-temperature superplastic deformation mechanism was studied. The results show that Ti6Al4V alloy has excellent low-temperature superplastic deformation properties in the atmospheric air. The strain rate sensitivity index is about 0.3 in the temperature range of 700~850 ℃. The superplastic deformation mechanism of Ti6Al4V alloy is grain boundary sliding at 850 ℃. The atypical superplastic deformation of the alloy occurs at 700~750 ℃.