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RISS 인기검색어
- 검색키워드
- 저자 : Abdollah Saboori (검색결과 2 건)
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Giuseppe Del Guercio,Manuela Galati,Abdollah Saboori 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Additive manufacturing processes allow producing complex geometries which include structures with enhanced mechanicalperformance and biomimetic properties. Among these structures, the interests on the use of lattice are increasing forboth medical and mechanical applications. The mechanical behaviour of the structure is closely correlated to its shape anddimension. However, up to now, far too little attention has been paid to this aspect. Hence, this work aims to explore theeffect of geometry, dimension and relative density of the cell structure on the compressive strength of specimens with latticestructures. For this purpose, various Lattice structures are designed with different geometries and dimensions. This approachleads to having structures with different relativity densities. Replicas of the designed structure are produced using Ti–6Al–4Vpowder processed by electron beam melting process. The samples are tested under compression. A new approach to calculatethe absorbed energy up to failure by the lattice structure is presented. The results show a close relationship between themechanical performance of the structure and the investigated parameters. In contrast with the current literature, the presentedexperimental data and a collection of the literature data highlight that the lattice structures with similar relative density donot exhibit the same Young’s modulus values.
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Mohamad Reza Bandekhoda,Mohammad Hossein Mosallanejad,Masoud Atapour,Politecnico di Torino,Abdollah Saboori 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
In the present study, corrosion properties and biocompatibility of as-built and as-polished Ti–6Al–4V samples fabricatedby Electron Beam Melting (EBM) and Selective Laser Melting (SLM) were investigated and compared with a conventionalsample as a reference. Optical microscope, Scanning Electron Microscope equipped with Energy Dispersive Spectroscopy,and X-ray diffraction analysis were employed for studying the microstructure and composition of the samples. Polarization,electrochemical impedance, and immersion tests were carried out to investigate the corrosion behavior and bioactivity ofthe samples in the Simulated Body Fluid solution. The results revealed that the EBM samples exhibited a superior corrosionresistance compared to the SLM one, thanks to the absence of low corrosion resistant α′ martensitic phases and a higher fractionof β phase in the EBM samples. It was also observed that while the wrought Ti–6Al–4V samples had a higher corrosioncurrent density than the additively manufactured ones, both EBM and SLM processes had a lower corrosion resistance in theas-built state than in the as-polished. The immersion tests in the SBF solution revealed a more significant bioactivity for theEBM samples than the SLM samples. Higher levels of the β phase in the EBM microstructure stimulated the nucleation andgrowth of the apatite on the sample surface. Also, higher surface roughness in the as-built samples improved the bioactivityby increasing the metal/electrolyte interface and thus forming more OH−groups on the Ti alloy surface.
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