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Titanium alloys have attractive properties for application in aeronautical components submitted to high temperature. Yttria-stabilized zirconia (YSZ) of thermal barrier coating systems (TBC) have become an alternative to increase the operational lifetime of turbine blades. The aim of this work was to evaluate the creep behavior of Ti-6Al-4V with TBC deposited by air plasma spray. Constant load creep tests were conducted in air on equiaxed Ti-6Al-4V (uncoated) and Ti-6Al-4V with TBC and the experimental parameters related to secondary creep were determined. All the coated samples showed a reduction of secondary creep rate values and, thereafter, higher creep resistance, which could be associated with oxidation protection and thermal insulation provided by the coating. Creep rate analysis suggests that the dominant creep mechanisms in all cases is the dislocation climb.

EVALUATION OF CREEP BEHAVIOR OF TI-6AL-4V ALLOY WITH THERMAL BARRIER COATING DEPOSITED BY AIR PLASMA SPRAY