Abstract
The deformation mechanisms occurring during room temperature tensile and low cycle fatigue testing were investigated. During fatigue the ordered γ′ precipitates restricted the dislocation movement to isolated {111} slip planes. The dislocations often moved in pairs as a result of γ′ shearing. Surface grains deformed more homogeneously as indicated by the dislocation cells. A band structure was also observed which resembled persistent slip bands in other age hardened alloys. These bands produced lamellar extrusions on the gauge surface. At higher strain ranges (Δε, > 2%), the strain was also accommodated through micro-twinning and grain rotation. The rotation of the grains produced an asterism in the TEM diffraction patterns which was also observed at higher strains in the tensile specimens.
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