Abstract
The true strain-stress curves of Ti-6Al-4V titanium alloy sheet were obtained by uniaxial tensile tests under different temperatures using a Gleeble 3800 thermo-mechanical testing machine. And fractograph of failed sample was studied by means of scanning electron microscopy (SEM). The evolution of metallographic structure was observed by optical microscopy. The effect of deformation temperature was analyzed, and deformation mechanism was discussed. The results show that the flow stress of Ti-6Al-4V is controlled by deformation temperature. Flow stress decreases with the increase of the temperature. After 600 °C, elongation of the specimens will increase as tensile temperature increases, and there will be a maximum average 63% when the temperature is 850 °C, and necking phenomenon will become more obvious. Deformation mechanisms exhibit dynamic recovery and dynamic recrystallization at high temperature region.
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