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Unraveling the hardening mechanism of AlCrNbSiTiN/AlCrN nanomultilayer coatings
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DOI：10.1016/j.vacuum.2026.115562.png)
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Abstract
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The rapid development of modern industry has generated an urgent need for new hard protective coatings. In this paper, a novel type of ultra-hard AlCrNbSiTiN/AlCrN nanomultilayer coating was developed by regulating the modulation periods of coating with a maximum hardness of an impressively high 47.8 GPa and a wear rate (WR) of only 7.7 × 10−8 mm3N−1m−1. It also has favorable toughness and resistance to plastic deformation, with H/E and H3/E2 of 0.1 and 0.49 GPa, respectively. In contrast to single-layer coatings, the wear mechanism shifts from oxidative wear to abrasive wear, with residual stress reduced by a maximum of 25.3%. In addition, the microstructure of the coatings was analyzed deeply, which reveals that the Hall-Petch fine-crystal strengthening effect and the Koelher modulus-difference stiffening effect as well as the enhancement of tensile/compressive alternating stress field effect induced by the high-density nanomultilayer interface are the dominant factors in the hardening of the coatings.
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