Optical Grain Size Measurements: What is Being Measured? Comparative Study of Optical and EBSD Grain Sizes Determination in 2D Al Foil

Sandra Piazolo; Vera G. Sursaeva; David J. Prior

doi:10.4028/www.scientific.net/MSF.495-497.213

Paper Titles

Automated Twin Identification Technique for Use with Electron Backscatter Diffraction
p.191

Orientation Maps Derived from TEM Diffraction Patterns Collected with an External CCD Camera
p.197

The Effect of Grain Orientation on Micro Frictional of Medium Carbon Steel
p.203

Scalar Measures of Texture Heterogeneity
p.207

Optical Grain Size Measurements: What is Being Measured? Comparative Study of Optical and EBSD Grain Sizes Determination in 2D Al Foil
p.213

Unbiased Evaluation of Chord Length Distributions from Orientation Maps
p.219

Extension of Orientation Mapping to the Transmission Electron Microscope
p.225

Effect of Orientation Noise on the Determination of Percolation Thresholds from Electron Back-Scatter Pattern Data
p.231

Three-Dimensional Texture Analysis
p.237

HomeMaterials Science ForumMaterials Science Forum Vols. 495-497Optical Grain Size Measurements: What is Being...

Optical Grain Size Measurements: What is Being Measured? Comparative Study of Optical and EBSD Grain Sizes Determination in 2D Al Foil

Abstract:

Reflected light optical analysis and Electron Backscatter Diffraction (EBSD) analysis have been used to m easure grain sizes in 2D Al foil samples, annealed for different times. There are significant differences in the results of the two techniques. It is shown that in Al it is possible to detect boundaries in optical images down to a misorientation angle of 7-8º. Nevertheless, in most samples the critical angle of easy etching lies above 10º. The observed differences in grain size measurements between optical analysis and EBSD analysis can be largely attributed to three phenomena: (1) individual samples may behave slighty differently due to differences in the effectiveness of etching (2) the grain size is heterogeneous over large areas and (3) the effect of etching is not only a function of misorientation angle but also grain boundary plane. Despite these uncertainties, optical analysis seems to be reliable for analysis of processes in which mainly grain boundaries with misorientation angle of > 10º are involved i.e. grain growth.

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Periodical:

Materials Science Forum (Volumes 495-497)

Pages:

213-218

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https://doi.org/10.4028/www.scientific.net/MSF.495-497.213

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Online since:

September 2005

Authors:

Sandra Piazolo, Vera G. Sursaeva, David J. Prior

Keywords:

Al Foil, EBSD Analysis, Grain Size, Optical Analysis, Statistics

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