metallographic microscope
Quick Summary
A metallographic microscope is a specialized optical microscope used to examine the surfaces of metals and alloys. Its primary function is to identify defects, determine crystal grain boundaries, and study the structure of these materials.1
Unlike microscopes used for transparent specimens, metallographic microscopes employ vertical illumination. This technique directs light down through the objective lens onto the opaque metal surface. The light that is reflected or scattered back is then captured by the objective and magnified for viewing. This allows for the examination of materials that do not transmit light.1
Metallography itself is the study of metal and alloy structures, often utilizing microscopic techniques. Microscopic examination, typically at magnifications between 100 and 1,500 diameters, reveals details such as grain size, phase distribution, and microsegregation. Etching polished metal surfaces with corrosive reagents helps to selectively dissolve components and reveal the underlying structure. These microscopes are also valuable in fields like forensic science.21
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