“…Currently, the improvement of AlCrN coatings is mainly focused on tuning the coating structure, such as through 2 of 14 alloying [8,26,27], multilayer systems [8,20,28], and gradient coatings [29,30]. Other ways to improve the properties of AlCrN include modifying the substrate properties, such as by nitriding [31,32], or modifying and tuning the coating deposition process [8,33].…”