MICROSTRUCTURAL CHARACTERIZATION AND FATIGUE BEHAVIOR OF COLD SPRAY COATED ALUMIUM ALLOY

Different sets of Al5052 alloy specimens have been coated by pure Al and Al7075 alloy powder, using low pressure cold spray coating technique. The microstructural evolution of the substrate after coating and the fatigue behavior of the coated structure have been surveyed. In order to obtain the fatigue S-N diagram of each set, as received and coated specimens have been tested at load control condition. The powders size distribution and shape has been studied by scanning electron microscopy (SEM). X- ray diffraction (XRD) has been used to measure the residual stress in both deposited material and the substrate. Grain size measurements are performed by XRD using a portable unit. The results of different characterizing tests have been then discussed to highlight the effects of this emerging surface treatment on the characteristics of the treated material.