The density of excess dislocations in Cu/Al coatings, deposited by using a mechanochemical technique, was investigated by using X-ray diffraction methods. For Cu coatings, values of 10nm, 6.4 x 1011/cm2 and 0.24GPa were estimated for the average size of sub-grains, excess dislocation density and shear strength, respectively. The strain-hardening mechanism of constraint on dislocation motion was suggested to be predominant in coating strengthening. A model was proposed for interdiffusion of the Cu and Al atoms at the Cu/Al interface. It was assumed that this interdiffusion was activated by impact-temperature oscillations, due to repeated ball/coating collisions during the deposition.

Deformations, Sub-Grain Structure, Dislocation Arrangement and Transition Layer Formation in Cu/Al Coating Deposited by Mechanochemical Technique. V.S.Harutyunyan, A.R.Torossyan, A.P.Aivazyan: Applied Surface Science, 2004, 222[1-4], 43-64