Hardness is an attribute of an item and not an elementary physical quality. It is the resistance a material has towards indentation, and it is established through the measurement of the gap left by the indentation. The process of determining the gap left by the indentation of a material is referred to as Vickers hardness testing. The method was created in 1921 as a different option to the Brinell hardness test to determine the hardness of substances.
In other words, when applying a load and a specific indenter, the tiny the indentation left, the harder a substance looks. The Vickers hardness testing process, also known as micro-hardness testing, is mainly used to measure ceramics and metals’ hardness. It is also used to measure the hardness of thin substances such as foils or the surface of small areas. The method consists of two well-defined load ranges, the Micro-indentation Vickers (10 to 1000g) and the Macro-indentation Vickers (1-100kg), to include each testing requirement.
The Vickers hardness test process entails indenting a test sample using a diamond indenter. The indenter is designed as a right pyramid that has a square base. It’s placed at 136 degrees on the opposite sides and exposed to a load of between 1 and 100 kgf. The load is often put on the diamond indenter for 10 to 15 seconds. Afterward, the gap left following the removal of the load is measured with a microscope’s help. Then, the area of the slanting sides of the indentation is measured.