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Creep-induced local lattice parameter changes in a monocrystalline nickel-base superalloy

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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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Authors and Affiliations

  1. Institut für Werkstoffwissenschaf- ten, Lehrstuhl 1, Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany

    H. Mughrabi & H. Biermann

  2. Institute for General Physics, Eötvös University, P.O.B. 323, H-1445, Budapest, Hungary

    T. Ungar

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  1. H. Mughrabi
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  2. H. Biermann
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  3. T. Ungar
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Mughrabi, H., Biermann, H. & Ungar, T. Creep-induced local lattice parameter changes in a monocrystalline nickel-base superalloy. JMEP 2, 557–564 (1993). https://doi.org/10.1007/BF02661741

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