Transmission electron microscopy study of fatigue deformation in Fe-25Cr-4Al alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)145-150
Journal / PublicationMaterials Science and Engineering
Volume95
Issue numberC
Publication statusPublished - Nov 1987
Externally publishedYes

Abstract

A ferritic Fe-25Cr-4Al alloy (where the composition is in weight per cent) was cyclically deformed at room temperature. Transmission electron microscopy (TEM) was used to investigate the dislocation structures developed in this alloy after cycling at various total strain amplitudes. TEM observations of a specimen deformed at a low strain amplitude (0.2%) revealed the presence of jogged screw dislocations, dislocation tangles and loop debris. As the total strain amplitude increased to 0.3%, there was a greater tendency for dislocation bundles to form in the alloy. These bundles were condensed into walls of a ragged cell structure as the applied strain amplitudes were subsequently increased. On further cycling of the alloy at a higher strain amplitude (2.0%), the dislocation density increased markedly, leading to the formation of a highly elongated and banded dislocation structure. © 1987.