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Shear mechanisms of the γ′ phase in single-crystal superalloys and their relation to creep

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Abstract

The development of dislocation configurations in a single-crystal superalloy during creep and especially the shear mechanism of theγ′ phase is investigated by a transmission electron microscopy (TEM) study. Detailed analysis shows that at low strains and at coherent interfaces, shearing occurs by dissociation of matrix dislocations at theγ/γ′ interfaces, while at high strains and incoherent interfaces, cutting of theγ′ phase is achieved by antiphase boundary (APB) coupled dislocation pairs. The results are discussed in their connection to creep behavior.

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Authors and Affiliations

  1. Institut für Metallforschung, Technische Universität Berlin, 1000 Berlin 12, Federal Republic of Germany

    Thomas Link (Research Assistant) & Monika Feller-Kniepmeier (Professor)

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  1. Monika Feller-Kniepmeier
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Link, T., Feller-Kniepmeier, M. Shear mechanisms of the γ′ phase in single-crystal superalloys and their relation to creep. Metall Trans A 23, 99–105 (1992). https://doi.org/10.1007/BF02660857

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  • DOI: https://doi.org/10.1007/BF02660857

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