Abstract
CrAlYN nanolayered coatings of greatly enhanced thermal stability have been developed by doping with levels of Y up to 9at.%. This prevented the complete dissolution of the layered structure after annealing at 1100°C in Ar for 1h, commonly observed in coatings with little or no Y content, although the bilayer period increased from ~5nm to ~10nm. The improved thermal stability is attributed to the formation of a continuous YN layer between the CrN and AlN layers, reducing the rate of interdiffusion.
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