Hot deformation characteristic and microstructural evolution of a near alpha alloy Ti-8Al-1Mo-1V

Titanium alloy grade Ti–8Al-1Mo-1V (Ti-811) has been widely applied for many applications such as aerospace, automotive and military industries due to their high specific strength, low density, and excellent corrosion resistance. In this work, cylindrical specimens with a height of 12 mm and diameter of 8 mm were machined for the hot compression tests. the flow stress behavior of near-α alloy Ti-811 was investigated by hot compression testing under conditions of varying temperature (between 950, 975, 1000, 1025, 1050 and 1075 ◦C), strain rates ( 0.001, 0.01, 0.1 and 1s-1) and true strain up to 0. 6. The stress–strain curves of Ti-811 alloy revealed that the continuous flow softening occurs, anyway, the flow softening amount show greater flow softening in the two phase region as compared to the single phase region. Mechanical testing and optical microscopy analyses indicate that dynamic recrystallization occurred, for single-phase β microstructure. However; a broad variety of microstructure formation mechanisms including allotropic phase transformations, platelet kinking and globularization occurred for two- phase α + β region.