This work focuses on the experimental characterization and mechanical behavior modeling of aeronautical alloy based composite to simulate tension test by finite element method and experimental test. The numerical finite element simulation allowed us to understand and manage a number of phenomena encountered during the mechanical behavior of our composites. Tensile tests applied have shown large changes in mechanical properties of the base alloy after coating, which are possibly related to the very different nature of the assembled materials and conditions of application. We note a strong decrease of the elastic limit of AG3 coated compared to AU4G. The high ductility of this alloy is the cause which engenders during the gritting process a large penetration of the granule particles in the substrate and the creation of plastic zones. Thus, a radial compression is exerted on the section which causes a plastification process. The decrease of the average section of the substrate after sandblasting, the stress concentration at the cavity and / or the compressive residual stress created when sandblasting are responsible for the decrease in breaking strength of the AU4G compared to the AG3. The material becomes hard and fragile. The experimental results obtained during our study are consistent with those of the simulation. Indeed, it was noted that the concentration of stresses during the tensile tests was located at the ends of the useful length of the test specimen.
<div>The present investigation has been conducted to study the tribological and
adhesion properties of X10CrNi18-8 austenitic stainless steel (ASTM 301)
coatings deposited on aluminum alloys such as AU4G by using the arc-spraying
process. These coatings were made with and without a bond-coat layer, which is
constituted by NiAl. The structure of the phases that are present in coatings
was characterized by X-ray diffraction (XRD) and scanning electron microscopy
(SEM). The measurements of microhardness and tribological behavior at different
loads were also performed on the surface of the coatings. Adherence test was
also carried out using four-point bending tests. The SEM showed that the dense
microstructures of coatings have a homogeneous lamellar morphology with the
presence of porosities and unmelted particles. The main phase of coating
corresponds to a solid solution as a face-centered cubic (fcc). The
microhardness of coatings is nearly four times that of the two substrates of
aluminum alloys. The four-point bending test results showed that the NiAl bond
layer increases the critical interfacial fracture energy <i>G</i>
<sub>IC</sub>, the force to share the multilayer is more important.</div>
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