| Abstract Scope |
Recently, the method called high-resolution imaging of misorientations in single crystals has demonstrated its usefulness in accurately determining the single crystal quality in superalloys. This was made possible by obtaining high-resolution angular measurements of misorientation (arc-sec) and high-resolution imaging (µm) combined with a relatively large measurement area. The technique combines traditional X-ray diffraction topography with high-resolution diffraction and advanced data post-processing, including color coding and 3D projections of diffraction images. It was demonstrated that the mosaic structure of superalloys is highly complex and varies at both the micro and macro levels.
In the present work, the advanced high-resolution X-ray diffraction method for imaging misorientation and mosaicity in single crystal superalloys was used to observe structural changes during uniaxial tensile loading. This research utilized single crystal flat tension samples from CMSX-4 superalloy prepared from the casting produced at a 3 mm/min withdrawal rate.
The results indicate that the crystallographic orientation changes are within a few degrees up to the rupture. The evolution of the plastic deformation region was directly observed on the samples by contrast blurring. |