A macrograph or photomacrograph is an image taken at a scale that is visible to the naked eye, as opposed to a
micrograph
A micrograph or photomicrograph is a photograph or digital image taken through a microscope or similar device to show a magnified image of an object. This is opposed to a macrograph or photomacrograph, an image which is also taken on a m ...
ic image. It is sometimes defined more precisely as an image at a scale of less than ten times magnification.
Materials science
This term is often applied to a three-dimensional image taken of a material using a low-power
stereomicroscope. These images are used in
materials science, particularly in the study of
stress fracture
A stress fracture is a fatigue-induced bone fracture caused by repeated stress over time. Instead of resulting from a single severe impact, stress fractures are the result of accumulated injury from repeated submaximal loading, such as running or ...
s in metals.
This method can also be used to assay the fine structure of steel, in a standardized test called the Baumann method that creates a
sulfur print showing the amount and distribution of sulfur inclusions through the metal structure.
[Arthur J. McEvily (2001]
Metal Failures: Mechanisms, Analysis, Prevention
Wiley-IEEE p 90
References
Laboratory techniques
Materials science
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