High resolution electron microscopy of a deformed superalloy: shear of precipitates

A two-phase nickel-cobalt superalloy deformed in tension at room temperature has been studied by high resolution electron microscopy (HREM). The alloy contains plate shaped precipitates which are sheared by the motion of dislocations during deformation. The matrix and precipitates have different cry...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1994-02, Vol.175 (1), p.141-148
Main Authors: GUETAZ, L, PENISSON, J. M
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Exact sciences and technology
Materials science
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:A two-phase nickel-cobalt superalloy deformed in tension at room temperature has been studied by high resolution electron microscopy (HREM). The alloy contains plate shaped precipitates which are sheared by the motion of dislocations during deformation. The matrix and precipitates have different crystallographic structures; the deformation is not homogeneous. Local deformations and rotations which appear near the shear plane are analysed, and a microscopic description of the precipitate shearing mechanism is proposed.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(94)91053-7