Fig. 8.
In-situ HT-XRD characterization of residual stresses in the Ti–Al–N coating on WC–Co. The compressive residual stress relaxation in thermo-cycle (I) is followed by a steep compressive residual stress increase (II). In the third cycle (III) the stress changes thermo-elastically. The compressive stress increase in thermo-cycle II is induced by the Ti0.52Al0.48N decomposition, in particular by the fcc-AlN to w-AlN transformation. Full (open) symbols correspond to heating (cooling) segments of the heat-treatment experiment.