diamond pyramid hardness

The diamond pyramid hardness test, also known as Vickers hardness, is a method for measuring the hardness of materials. It was developed in the 1920s by engineers at Vickers, Ltd.. This test uses a pyramid-shaped diamond indenter, with opposite sides meeting at a 136° angle, which is pressed into the material's surface under a specific load. The size of the resulting indentation is then measured using a microscope. The Vickers number (HV) is calculated based on the applied load and the area of the indentation. This test is reliable for metals and is also used for ceramic materials. A related test, the Knoop hardness test, uses a diamond indenter with a different shape and is particularly useful for brittle materials.123