Dynamic Response of Pure Titanium up to 1000� C Conference Paper uri icon

abstract

  • Yield and spall strengths of pure polycrystalline Ti (99.99% Ti) studied in a series of planar impact experiments with initial sample temperature ranging from 20 to 1000 °C. In a separate series of experiments the temperature dependence of the longitudinal speed of sound in Ti was measured on the basis of reverberation of the stress pulse generated in the 3‐mm Ti sample by a 1‐mm aluminum impactor. In all the experiments the velocity of the sample free surface was continuously monitored by VISAR. It was found that the yield strength of titanium α‐phase has a 250‐MPa maximum at ∼600 °C followed by a 100‐MPa minimum at ∼800 °C. Further heating towards the α‐β transformation temperature, 882 °C, results in an increase of the strength up to 200 MPa. In β‐domain the yield strength of titanium stays constant and close to 100 MPa. The spall strength of titanium drops from ∼3 GPa at 800 °C to ∼2.5 GPa at 840 °C, indicating the shock‐induced α‐β transformation. Possible plastic deformation mechanisms responsible f...

publication date

  • January 1, 2008