Abstract
Pin-on-disk and cavitation tests were performed on an innovative Al-Mg alloy modified with Sc and Zr for additive manufacturing, which was tested in annealed condition. The damaging mechanisms were studied by observations of the morphology of the sample surface after progressive testing. These analyses allowed the identification of an adhesive wear mechanism in the first stages of pin-on-disk test, which evolved into a tribo-oxidative one due to the formation and fragmentation of an oxide layer with increasing testing distance. Regarding cavitation erosion, the AlMgSc alloy was characterized by an incubation period of approximately 1 h before mass loss was measured. Once material removal started, mass loss had a linear behavior as a function of exposure time. No preferential sites for erosion were identified, even though after some minutes of cavitation testing, the boundaries of melting pools can be seen. The comparison with literature data for AlSi10Mg alloy produced by additive manufacturing technology shows that AlMgSc alloy exhibits remarkable wear resistance, while the total mass loss after 8 h of cavitation testing is significantly higher than the value recorded for AlSi10Mg alloy in as-built condition.
Highlights
Metal additive manufacturing (AM) is an innovative but already established material processing technology for the production of parts and prototypes based on layer-by-layer build-up [1]
In this study, sliding wear and cavitation tests were performed in order to characterize an AlMgSc this study, sliding in wear and cavitation were performed in characterization order to characterize an alloyIn produced by direct metal laser sintering (DMLS)
Pin-on-diskof sliding tests demonstrated that the manufactured studied material a significant layers of melting pools
Summary
Metal additive manufacturing (AM) is an innovative but already established material processing technology for the production of parts and prototypes based on layer-by-layer build-up [1]. This technique allows an unrivalled design freedom, not reachable via conventional manufacturing routes, combined with a high quality and outstanding mechanical properties [1,2,3,4,5]. Some studies focused on an innovative Al-Mg alloy modified with Sc and Zr for additive manufacturing, commercially known as Scalmalloy® This alloy showed outstanding strength and ductility, together with very low anisotropy [16]. The alloy is characterized by an overall fine-grained structure, which limits the influence of building direction
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