Assignment Task :

Discussions

The following questions should be addressed in the report 2

    1. Why the SEM sample used I this experiment was polished without etching? (5%)

    2. Why 15 mm working distance was chosen for the EDS work? (5%)

    3. The images supplied in this work are backscattered electron images and discuss the advantages of using backscattered electrons over the use of secondary electrons in this case. (10%)

    4. If secondary electrons were used for imaging what would you expect the differences between the backscattered electron images and the would-be secondary electron images? (5%)

    5. Why do we need to have an area analysis before the spot analysis? (5%)

    6. In the EDS microanalysis a standardless program was used to cover x-ray intensities into compositions. Explain what does the standardless analysis mean?  Discuss the advantage and disadvantage of using standardless EDS program to analyze the composition of a material. (35%)

    7. Usually several analysis points of the same phase are chosen. It is normal if there is a small discrepancy between analysis points of the same phase. However, the difference shown in two points of the same bright α phase is too large to be normal. Discuss the possible reasons for the abnormal observation. (5%)

    8. Plot the composition of the alloy and the compositions of α(bright),β(grey) and γ (dark matrix)in an equilateral triangle and connect the compositions of α(bright),β(grey) and γ (dark matrix) to form a triangle known as tie-triangle i.e. a part of a ternary phase diagram at 1000°C. Is the composition of the alloy within the triangle? (5%)

    9. Use the tie-triangle and the lever rule to work out the volume fraction of each phases in the system.

 

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  • Posted on : October 13th, 2018

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