The micro mechanical behavior under compression for a cube-oriented single crystal Ni-base superalloy
was in-situ studied by synchrotron high energy X-ray diffraction at room temperature. Both elastic and
plastic deformation altered the mismatch strain between g and g0 phases with different variances.The
deformation-induced interface coherency strain relaxation was observe dafter yield ingasevidenced by
an increment of lattice mismatch and an abnormal decrease in full width at half maximum(FWHM),
which is attributed to aggregating of dislocations to ward phase boundaries.A dislocation-mismatch
model is proposed to correlate the relative change in lattice mismatch and FWHM during deformation,
which fits the experiment well.