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A measure of the
hardness of a metal introduced by Vickers in 1922. In the Vickers test
(suitable for surface-hardened metals), a pyramidal diamond is pressed
into the material being tested. The Vickers hardness is the amount of
force applied to the diamond divided by the area of the indentation the
diamond makes in the material; in practice the diagonal of the pyramidal
indentation is measured and the result, computed in kilograms of force
per square millimetre, is read from a table. (The reading should be
stated as an empirical measurement, without units.)
Up to about HV 500,
the Vickers hardness is about 1.04 times the Brinell hardness.
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