Mechanical Properties of Single Crystal Transition-Metal Nitride Strained-Layer Superlattices Exhibiting Extremely High Hardnesses

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This research program centers on the mechanisms of enhanced mechanical strength and modulus in superlattices of the transition metal nitride type. Growth, chemistry, structure, and mechanical properties are measured as functions of the processing variables, which include composition modulation, layer perfection, wavelength, and crystallographic orientation. Initial research is limited to the titanium nitride/vanadium- niobium nitride system. Variations in lattice mismatch are accomplished through control of layer compositions.