Dependence of the grain boundary misorientation distribution in Supral 2004 on the plane of observation

Journal Article · Fri May 21 04:00:00 EDT 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00096-2· OSTI ID:20023102

Perez-Prado, M T; McNelley, T R

Two different recrystallization reactions that can enable superplastic response in Aluminum alloys have been described in the literature. Recent investigations by computer-aided EBSP analysis methods have shown that the superplastic alloy Supral 2004 exhibits a continuous recrystallization reaction upon annealing of as-processed material. Distinctly bimodal grain boundary misorientation distributions were observed, with peaks corresponding either to high-angle boundaries, of misorientation in the range 55--60{degree}, or to moderately misoriented boundaries, or misorientation in the range of 5--15{degree}. The interactive methodology used involved the sequential acquisition of adjacent grain orientations along a path consisting of linear segments in a square raster-type of pattern on the TN plane of a bulk sample, where R is the final rolling direction and N is the sheet normal direction. The as-processed microstructure was highly directional in nature, presumably due to mechanical fibering during the final cold rolling stage of the deformation processing of the material. In such a circumstance, the distribution of adjacent grain misorientations may depend upon the plane of observation and this data acquisition methodology would allow assessment of the dependence of misorientation distribution on the plane of observation. In the present study, the misorientation distribution for adjacent grains on three orthogonal planes has been characterized by EBSP methods in Supral 2004 after selected annealing treatments. A microstructural model is proposed to interpret the dependence of the grain boundary misorientation distribution on the plane of observation.

• Research Organization: CENIM/CSIC, Madrid (ES)
• OSTI ID: 20023102
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
ANNEALING
BACKSCATTERING
GRAIN BOUNDARIES
GRAIN ORIENTATION
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY