MATE413/MATL913: The Theories About Imaging Contrast Mechanisms And Spatial Resolution - Engineering Assessment Answer

Subject Code: MATE413/MATL913 Internal Code: 1AHJHG

Engineering Assessment Answer

TASK: Your report should be in the style of a scientific paper and will comprise seven sections: 1. abstract 2. introduction 3. Review of scanning electron microscopy 4. experimental 5. results 6. discussion 7. conclusions or summary 8. references In the abstract the main experiments and most important findings are summarised concisely. In the introduction you should explain why the work is necessary and give enough background information to prepare the readers for the range and organisation of the topics to follow. In the review of scanning electron microscopy should briefly cover the theories about imaging contrast mechanisms and spatial resolution of various imaging techniques, such as secondary electrons, backscattered electrons and characteristic X-rays used in SEM. In the review you should have a section of EDS microanalysis in SEM. In this section you may start to describe the production of characteristic x-rays in SEM and how the characteristic x-rays are used for qualitative and quantitative microanalysis in SEM. In the quantitative microanalysis you should describe the first approximation and ZAF corrections in details. In the experimental you should describe the instruments and specimens used in the experiments in details as well as the qualitative and quantitative EDS microanalysis procedures. In the results section you should present a series of quality secondary and backscattered electron images of your samples, typical EDS spectra of various phases and quantitative EDS results. In the discussion you should discuss: a) Effects of operating conditions on the quality and resolution of SEM images b) Compare your EDS results of your sample Ti-42Al-10Mn(at%) with the results of chemical analysis of the same alloy and use the comparison result to make a judgement on your EDS results or make a correction to your EDS analysis of each phase observed in your sample c) Estimate the volume fraction of each phase in the sample according to the composition of each phase

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