Cavitation phenomenon of commercially pure titanium

Cavitation caused during superplastic straining of a commercially pure titanium alloy under uniaxial test was studied. Tensile tests were conducted with a constant strain rate of 0.01 s−1 at different temperatures. Studies show that commercially pure titanium alloy does not show good superplasticity due to cavitation. Many cavitations are formed at the grain boundary of triple points during tensile test at relatively low temperatures (below 600 °C). As strain increase, both the number of cavities and the average cavity diameter increase. However, no such phenomena can be found when the alloy deformed at higher temperatures (750 and 800 °C). Studies also show that the pre-existing defects are the main cause for cavitation formation. These defects can be sintered when deformed at temperature above 750 °C.