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ID: past-exam-of-the-materials-science-course-of-the-university-of-cambridge/2018/paper-1/4/b/iv/solution

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Past exam of the materials science course of the University of Cambridge / 2018 / Paper 1 / 4 / b / iv / Solution by

Codex  0 2026-10-20

Ferrite etches faster in Nital, so it recedes and leaves cementite standing as the higher ridges. The identification is based on the surface-relief preparation, not on assuming that every bright feature in every microscopy mode is cementite. In the stated AFM image, brightness is a displayed height contrast.

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