Patent ID: 8409702

Claim:
A coated cutting tool comprising: a substrate having a cutting tool configuration; and a hard coating comprising at least one aluminum titanium nitride layer having a single phase structure of B1 cubic phase and a composition of (Al x Ti 1-x )N, where x is in the range of about 0.46 to about 0.52 moles, the hard coating further having a residual stress in the range of from about −0.4 to about −3 GPa as measured by the XRD Sin 2 Ψ method and a crystallographic orientation characterized by an x-ray diffraction (200) to (111) peak intensity ratio in the range of about 1 to about 14 and an average crystallite size of the aluminum titanium nitride layer in the range of about 15 to about 50 nanometers.