According to the American Iron and Steel Institute, hardness means resistance to kindentation. According to the American Federation of Mineralogical Societies, hardness is determined by using the Mohs hardness scale. The strength of a material depends on factors including tensile strength, toughness, yield strength, hardness, density, and more. When all parameters are taken into account, there is no material that is at a perfect 10 on Mohs hardness scale but diamonds are the hardest known material.
The strongest metals are tungsten, osmuim, and titanium. To create an even stronger material, metals are mixed together. Composite materials are used commonly by the military and the manufacturing industry. A composite material called Chobham Armor, which is though to contain steel, ceramic, and air gaps, was created by the British military. The video below shows the transition from steel to Chobham Armor for military tanks.
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