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The mismatch and residual stresses were measured using X-ray diffraction in a single crystal Ni-base superalloy after creep deformation.The stress-free lattice parameters were also obtained from the calculation of residual stresses.After creep deformation,tetragonal distortion was found.The specimen undertook compression stress on transverse surface.At the phase boundaries,γ′phase suffers compression stress and γ phase suffers tensile stress.