1.9.1 Light microscope images
Images of etched specimen at 100, 200, 500 and 1000 times magnification. Duplex phase brass microstructure, alpha and Kappa phase, with grains aligned in the ED. The etch effect of crystallographic orientations makes grains easy to distinguish, but the phases are not very easy to separate from these images. Small particles can be seen, they are etched dark, they appear to be round and homogeneously distributed. EDS results propose that they are mainly lead particles.
Etching: 5g ferric chloride + 10ml conc. hydrochloric acid + 100 ml de-ionised water.
Specimen surface was parallel with extrusion direction (X=ED).
Position ¼ depth.
1.9.2 EBSD/EDS analysis in the SEM
EBSD analysis with 1 µm step size
The material show a duplex, banded micro-structure consisting of alpha and kappa phase. In this limited area it is difficult to make assumptions about texture. In literature it is reported that CW724R also could contain Gamma phase but in this analysis Gamma phase description was not included during analysis.
Specimen surface was parallel with extrusion direction (X=ED). Position ¼ depth.
Surface was OP-S-polished.
Grain- and phase boundaries
In this material there is a tendency to have low angle boundaries. In the previous IPF maps there are shifts of colour within grains. The assumption would be that some plastic deformation occurred after recrystallisation during extrusion.
EDS mapping in parallel to EBSD analysis
Large area mapping – Many (>40) analyses stitched together
The large area make statistics for grain size, phase fractions, texture, etc. better and now it is obvious that there ARE preferred orientations in X (ED). Pole figures for both phases show textures for the alpha phase <100>&<111>//ED, and for the kappa phase <1010> // ED.
Grain size, area weighted distribution