Abstract
Chemically vapour deposited multilayer κ-Al 2O 3 and multilayer α microscopy. Cross-section thin foils were prepared from alumina-coated cemented carbide cutting tool inserts. Special emphasis has been given to the examination of the α and κ polymorphs in the differen The thickness of each alumina layer was 1 μm. Grain refinement was obtained by the renucleation of Al 2O 3 on each modification layer. The microstructure of the α-Al 2O 3 layers consisted of equiaxed grains with a large number of dislocations and pores, while the κ-Al 2O 3 layers consisted of columnar twinned grains which were di randomly distributed, while the preferred growth direction of κ-Al 2O 3 was along the c axis. Observation of the growth of α-Al 2O 3 on both α- and κ-bonding a needle-shaped bonding layer. In both the α and κ multilayers, the occ the first alumina layer was directly related to the morphology of the bonding layer.
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