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BS ISO 13067:2020

$167.15

Microbeam analysis. Electron backscatter diffraction. Measurement of average grain size

Published By Publication Date Number of Pages
BSI 2020 36
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This document describes procedures for measuring average grain size derived from a two-dimensional polished cross-section using electron backscatter diffraction (EBSD). This requires the measurement of orientation, misorientation and pattern quality factor as a function of position in the crystalline specimen[ 1]. The measurements in this document are made on two dimensional sections. The reader should note carefully the definitions used (3.3) which draw a distinction between the measured sectional grain sizes, and the mean grain size which can be derived from them that relates to the three dimensional grain size.

NOTE 1

While conventional methods for grain size determination using optical microscopy are well-established, EBSD methods offer a number of advantages over these techniques, including increased spatial resolution and quantitative description of the orientation of the grains.

NOTE 2

The method also lends itself to the measurement of the grain size of complex materials, for example those with a significant duplex content.

NOTE 3

The reader is warned to interpret the results with care when attempting to investigate specimens with high levels of deformation.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 3.1 Terminology associated with EBSD measurement of grain size
12 3.2 Terminology associated with grains and grain boundaries determined via EBSD
3.3 Terminology associated within grain size measurement
14 3.4 Terminology associated with data correction and uncertainty of EBSD maps
4 Equipment for grain sizing by EBSD
4.1 Hardware requirements
15 4.2 Software requirements
5 Acquiring the map for grain sizing by EBSD
5.1 Specimen preparation
5.2 Defining specimen axes
5.3 Stage positioning and calibration
16 5.4 Linear calibration
5.5 Preliminary examination
5.6 Choice of step size
18 5.7 Determination of the level of angular accuracy needed[7][8]
5.8 Choice of areas to be mapped and map size
19 5.9 Considerations when examining plastically deformed materials
6 Analytical procedure
6.1 Definition of boundaries
6.1.1 Grain boundary angles
20 6.1.2 Handling incomplete boundaries
6.1.3 Dealing with special boundaries
6.2 Post-acquisition treatment of raw data
6.3 Data-cleaning steps
24 6.4 Measurement of sectional grain size
6.5 Calculation of average grain size
25 6.6 Representation of data
7 Measurement uncertainty
26 8 Reporting of analysis results
28 Annex A (informative) Grain size measurement
30 Annex B (informative) Reproducibility
33 Bibliography
BS ISO 13067:2020
$167.15