ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Selective Backscattered Electron Imaging of Material and Channeling Contrast in Microstructures of Scale on Low Carbon Steel Controlled by Accelerating Voltage and Take-off Angle
Tomohiro AoyamaMasayasu NagoshiHideki NaganoKaoru SatoShigeaki Tachibana
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2011 Volume 51 Issue 9 Pages 1487-1491

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Abstract

We studied the behaviors of contrast in backscattered electron (BSE) images of cross-sectional heat-treated steel under various accelerating voltages and take-off angles. Changes in these conditions resulted in dramatic changes in contrast. Low accelerating voltage and low take-off angle improved the surface information and channeling contrast, whereas high accelerating voltage and high take-off angle enhanced the bulk information and reduced channeling contrast, resulting in improved Z contrast. Such behavior can be understood by the ratio of low-loss electrons (LLEs), which are related to channeling contrast, to the inelastic BSE components detected. The distribution of these components varies with the accelerating voltage and take-off angle: the detection ratio of LLE to inelastic BSE increases with decreasing accelerating voltage and take-off angle. The results obtained in this study will be useful for obtaining Z and crystallographic information separately in BSE images for the material of interest.

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© 2011 by The Iron and Steel Institute of Japan
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