Effect of vibrations on creep behaviour of CMSX-4 single crystals

Creep curves at 800°C and 720 MPa were measured for superalloy single crystals CMSX-4 at various amplitudes of superimposed vibrations. The effect of the vibrations on creep strain rate and on lifetime was found to be strong over the whole range of amplitudes used, being beneficial at the smaller amplitudes and detrimental at higher amplitudes.