Creep-induced local lattice parameter changes in a monocrystalline nickel-base superalloy |
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Authors: | H Mughrabi H Biermann T Ungar |
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Affiliation: | 1. Institut für Werkstoffwissenschaf- ten, Lehrstuhl 1, Universit?t Erlangen-Nürnberg, D-91058, Erlangen, Federal Republic of Germany 2. Institute for General Physics, E?tv?s University, P.O.B. 323, H-1445, Budapest, Hungary
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Abstract: | The γ-γ lattice mismatch of specimens of the monocrystalline nickel-base superalloy SRR 99 has been measured by a high-resolution
X-ray diffraction technique for the undeformed state and after high-tem-perature creep deformation. During creep deformation
beyond the minimum creep rate (total strain =0.5%), the lattice mismatches, measured in and perpendicular to the 001] stress
axis, respectively, un-dergo changes in opposite directions. This reflects the buildup of a complex deformation-induced triaxial
state of internal stress in the phases y and γ. The overall resolved shear stresses that act in γ and y due to the combined
action of the external and internal stresses are estimated, and the conditions under which cutting of the γ phase by dislocations
should occur are discussed. |
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Keywords: | high-temperature creep internal stress lattice mismatch nickel-base superalloy residual stress X-ray diffraction |
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