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- W2007002802 abstract "Mechanical and tribological properties of nanolayered composites of Al/Al2O3 and Ti/TiN were investigated. Alternating layers of metals and ceramics were deposited using an r.f. magnetron sputtering technique. Nonoindentation tests were performed to determine force-displacement curves which were used to calculate elastic moduli and nanohardness of composites as a function of distance between layers. It was observed that both elastic modulus and hardness of composites increased with decreasing layer thickness. A good agreement was found between experimentally determined values for elastic modulus and predictions based on the rule of mixtures for isostress conditions. The hardness of Al/Al2O3 and Ti/TiN could be described in the formalism of the Hall-Petch-type equation indicating that ceramic layers inhibited slip transfer across metallic layers. A deviation from the Hall-Petch type of strengthening was observed in Al/Al2O3 at small interlayer spacings. Friction and wear behaviour of laminates was studied using a pin-on-disc type of tribometer. A systematic increase in wear resistance with decreasing layer thickness was observed. The peak friction coefficient decreased about 70% in Al/Al2O3 (with 200 nm Al layer thickness) while a significant 60% improvement in steady state friction coefficient was measured in Ti/TiN (with 150 nm Ti layer thickness) in comparison with as-sputtered monolithic metallic films. These observations indicated that the nanolaminated films are suitable for applications where a combination of low coefficient of friction, high wear resistance and hardness is required." @default.
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- W2007002802 date "1994-12-01" @default.
- W2007002802 modified "2023-10-14" @default.
- W2007002802 title "Mechanical properties and tribological behaviour of nanolayered Al/Al2O3 and Ti/TiN composites" @default.
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- W2007002802 doi "https://doi.org/10.1016/0257-8972(94)90202-x" @default.
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