Abstract
The aim of this work was to produce deposits of AA6351-T6, reinforced with alumina (Al2O3) particles, over a substrate of AA5052-H32 through friction surfacing. AA6351-T6 consumable rods were drilled with one and two holes, which were filled with Al2O3 particles posteriorly. To perform the deposition, a conventional KONE KFE-3/BR milling machine was used. The results showed that Al2O3 particles increase the hardness values of the produced deposits when compared to those without particle addition. The coatings presented a fine equiaxed grain size distribution, once the grain refinement was nearly 48% lower than the as-received material. Moreover, deposit regions that showed finer grain boundaries also showed a higher volume fraction, which can be related to the particle stimulated phenomenon. Electron backscatter diffraction results showed the occurrence of low angle grain boundary substructures and lattice rotation, indicating that the material undergoes dynamic recrystallization during friction surfacing.
Highlights
Friction surfacing (FS) is a solid-state technology based on plastic deformation through which it is possible to joint two different metals or alloys
The Al2O3 volume fraction were determined based on ASTM E562-11 standard (Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count)
Friction surfacing with two holes in the consumable rod showed a higher predominance of defects, indicating that for the present case, enhancements in rod feed rates or axial loads are required
Summary
Friction surfacing (FS) is a solid-state technology based on plastic deformation through which it is possible to joint two different metals or alloys. During the FS process, a consumable rod with a high rotation speed is pressed against a substrate under an axial load. In the FS process, the conditions of pressure and temperature lead to an interdiffusion process resulting in the bonding of the material from the consumable rod to the substrate[1,2,3,4]. Once there is no melting of the materials involved, it is possible to joint two dissimilar materials that could not be jointed using other coating technologies that involve melting of one or two of the parts involved[1,2,5,6]
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