Low cycle fatigue of a Ni-based superalloy: Non-planar deformation

Cyclic softening is observed in the polycrystalline Ni-based superalloy R104 at elevated temperatures. Using transmission electron microscopy characterization methods, the damage evolution in fatigued specimens was studied. The observed deformation modes include paired APB shearing, intense planar d...

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Bibliographic Details
Published inScripta materialia Vol. 62; no. 10; pp. 790 - 793
Main Authors Phillips, Patrick J., Unocic, Raymond R., Kovarik, L., Mourer, David, Wei, Dan, Mills, Michael J.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2010
Subjects
Cube-slip
Deformation structure
Low cycle fatigue
Scanning/transmission electron microscopy
Scanning/transmission electron microscopy
Deformation structure
Cube-slip
Low cycle fatigue
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Summary:Cyclic softening is observed in the polycrystalline Ni-based superalloy R104 at elevated temperatures. Using transmission electron microscopy characterization methods, the damage evolution in fatigued specimens was studied. The observed deformation modes include paired APB shearing, intense planar dislocation bands, and cross-slipping processes between {1 1 1} and {0 0 1} planes. A rationale for the observed mechanisms in terms of time-dependent damage processes will be discussed.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.01.044