How do we measure the hardness of aluminum?

The hardness of aluminum can be measured using various standardized tests. The most common methods include the Brinell Hardness Test, where a hard steel or carbide ball is pressed into the aluminum surface, and the Vickers Hardness Test, which uses a diamond pyramid indenter. The Rockwell Hardness Test is also used, applying a diamond cone or steel ball to the surface. The hardness is quantified by the depth of the indentation, and the results are expressed in specific hardness units like BHN (Brinell Hardness Number), HV (Vickers Hardness), or HR (Rockwell Hardness). These tests provide a measure of the material's resistance to deformation, which is crucial for applications requiring strength and durability.