Abstract
The evolution of grain boundary microstructures has been characterized of a Fe-base oxide dispersion strengthened (0DS) alloy crept at stress substantially less than the threshold stress for dislocation creep. The alloy used for the present study was 0DS MA 956 (Fe-20Cr-5Al-0.5Ti-0.5 Y2O3) with a coarse-elongated grain structure. A bicrystal creep sample with the grain boundary inclined about 45° to the applied stress axis was cut from the coarse grained polycrystall ine bar. Creep test was performed at 1100°C with the stress of 21 MPa. The test was interrupted after 18,000 hours for microstructural investigation. The samples for TEM examination were obtained by cutting a thin slice from the gauge section parallel to the stress axis, followed by grinding, jet polishing, and etching and ion milling (when needed) the 3 mm disc containing a segment of the grain boundary. Microstructural analysis was carried out using Philips 400 TEM/STEM equipped with FEG.
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