It measures the resistance of the material to
indentation.
Hardness tests measure the plastic deformation (the
size or depth) of an indentation.
Brinell
hardness tests use spheres as indenters;
The
Vickers test uses pyramids.
Rockwell
tests
use cones or spheres.
Micro
hardness tests for specimens are also available, using the Knoop method with miniature pyramid
indenters. Another hardness scale is Mohs’
scale, which lists materials in order of their hardness, beginning with
talc and ending with diamond.
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