What must be the reason behind the hardness of metals?
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Metal hardness is a characteristic that determines the surface wear and abrasive resistance. The ability of a material to resist denting from impact is related to hardness as well as a material’s ductility. Various degrees of hardness may be achieved in many metals by tempering, a heat treatment process used in cold rolled and cold worked metals.
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Hardness is the ability of a material to resist deformation, which is determined by a standard test where the surface resistance to indentation is measured. ... Hardness correlates approximately with ultimate tensile strength in metals.
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