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Transmission electron microscope (TEM) study of annealed gamma alumina coatings for cutting tools and of gamma alumina‐coated cutting tools after the use in cutting tests

Among the transition phases of alumina, the gamma alumina‐phase has a high potential for the use as hard coating in many technological applications, because it exhibits excellent properties e. g. high hot hardness and high thermal stability. In the present work, transmission electron microscopic (TEM) studies are used to investigate the phase stability of nanocrystalline gamma alumina‐coatings. These coatings were deposited by means of magnetron sputter ion plating (MSIP) on cutting inserts with a titanium‐aluminum‐nitride‐interlayer or directly onto silicon‐wafers. Before transmission electron microscope‐investigation, the samples were annealed or used in cutting tests.