Cyclic-loading-induced accumulation of geometrically necessary dislocations near grain boundaries in an Ni-based superalloy

E-Wen Huang*, Rozaliya I. Barabash, Gene E. Ice, Wenjun Liu, Yee Lang Liu, Ji Jung Kai, Peter K. Liaw

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

In this study, the fatigue-induced microstructure produced in a nickel-based polycrystalline superalloy that was subjected to cyclic loading was characterized by polychromatic x-ray microdiffraction (PXM) together with in-situ neutron diffraction and transmission-electron microscopy (TEM). In-situ neutron-diffraction measurements reveal two distinct stages of the fatigue damage: cyclic hardening followed by cyclic softening. Three-dimensional spatially resolved PXM micro-Laue measurements find an increase in the density of geometrically necessary dislocations near the grain boundaries, which is accompanied by lattice rotations and grain subdivisions. The PXM results are in agreement with the in-situ neutron-diffraction and TEM results.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalJOM
Volume61
Issue number12
DOIs
StatePublished - 1 Dec 2009

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