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- 검색키워드
- 저자 : Masoud Atapour (검색결과 2 건)
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Alireza Razazzadeh,Masoud Atapour,Mohammad Hossein Enayati 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
High entropy alloys (HEAs) have received tremendous attention in diferent applications because of their excellent corrosion resistance and superior mechanical properties. In the present work, a novel TiNbMoMnFe high entropy alloy systemwas synthesized and deposited on AISI 316L by DC magnetron sputtering system. The microstructure of the resulting thinflm was evaluated by grazing incidence X-ray difraction and feld emission electron microscope. It was found that the thinflm microstructure is composed of a crystalline solid solution (grain size of 76 nm) and an amorphous phase. The electrochemical investigations in Ringer’s solution revealed that a thin flm of 670 nm thick high entropy alloy has a low corrosioncurrent density of 0.024 μA cm−2, approximately 30% lower than that of the uncoated 316L. Meanwhile, the HEA thin flmshowed the highest pitting corrosion resistance and stability of the passive flm. The wettability examinations exhibited thatthe coated sample has a high contact angle of 90° in contrast to 60° for the uncoated ones. In summary, the TiNbMoMnFehigh entropy alloy thin flm shows great potential for use in biomaterial applications.
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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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