Microhardness measurement in nonmetallic materials
The load dependence of Vicker’s indentation hardness has been measured in some non-metallic materials and thin foils. A load of 100 g appears to be appropriate for comparing materials. Foil thickness, especially for soft metals like copper, must be at least twenty times the impression diagonal to get a correct value of hardness. The Meyer index varies for materials and can be used for comparison because it seems to pertain to the nature of chemical bonds. The index for boron carbide is similar to glass as was expected by Rice.
Volume 43, 2020
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