Thermal Cycle Behavior of the Interface of AG3/75E/55E and AU4G/75E/55E Multimaterials Elaborated by Thermal Spray

Abstract

This study aims at the elaboration of two aluminum alloys based multimaterials (AG3/75E / 55E, AU4G/75E/55E); using the thermal projection technique. Thermanit stainless steel (55E) was deposited on two aluminum alloys: AG3 (5754) and AU4G (2017A) which are commonly used in the aeronautical industry; a Ni-Al bond coat (75E) was deposited between the coatings and the substrates to avoid the unwanted effect of aluminum oxide on the two substrates which acts as a diffusion barrier and therefore penalizes bonding. A thermal fatigue device was also used in order to study physico-chemical and mechanical behavior of the interface under application of thermal shocks and post treatment. The results show a better better resistance to cycles thermal in the case of composite AU4G/75E/55E was noted.