Analysis of interfacial dislocations in a single crystal nickel-base superalloy after [001] creep at 1033K. Evolution of internal stresses

Single crystal Ni-based superalloys (SRR99) are composites consisting of high fractions of the ordered L1 sub 2 gamma ' phase embedded in the fcc matrix. Since there is a misfit between the two phases coherency stresses develop in the microstructure. FEM calculations of the principal stress dis...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1994-05, Vol.30 (10), p.1275-1280
Main Authors: Feller-Kniepmeier, M., Hemmersmeier, U., Kuttner, T., Link, T.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
Exact sciences and technology
Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, epr, nmr, etc.)
Metals. Metallurgy
Physics
Structure of solids and liquids
crystallography
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Summary:Single crystal Ni-based superalloys (SRR99) are composites consisting of high fractions of the ordered L1 sub 2 gamma ' phase embedded in the fcc matrix. Since there is a misfit between the two phases coherency stresses develop in the microstructure. FEM calculations of the principal stress distributions have shown that the narrow matrix channels are highly loaded in compression parallel to the gamma / gamma ' interfaces, while tensile stresses perpendicular to the interfaces are small. A study was made of the evolution of interfacial dislocations at the early stages of creep and at medium temperatures where the diffusion effects can be neglected. The interfacial dislocations were used for an experimental check of the micromechanical and the crystallographic model.
ISSN:0956-716X
DOI:10.1016/0956-716X(94)90258-5