The high strain rate properties and microstructure observations of cobalt base superalloyd contains 0.9% Ti were
investigated using Hopkinson bar. These cobalt base superalloys are tested at strain rates of 2×103
, 3×103
and 4×103
s-1
and at different temperatures (25, 500 and 900°C), respectively. It is found that the stress flow and strain rate sensitivity
increases with increasing strain rate but decrease with increasing temperature. The microstructure observations confirm
that the high strain rate mechanical behavior of the cobalt base superalloys specimens are directly related to the effects
of the strain rate, temperature and the evolution of the microstructural texture. The strengthening mechanism in cobalt
base superalloys is the multiplication of dislocation. The dislocation density increases with increasing strain rate but
decrease with increasing temperature.