The impact of post manufacturing treatment of functionally graded Ti6Al4V scaffolds on their surface morphology and mechanical strength
| Autor: | Matthias Epple, Dmitriy Khrapov, Giovanni Bruno, Andrey Koptyug, Maria A. Surmeneva, Kateryna Loza, Fabien Léonard, Roman A. Surmenev, Kayrat Manabaev, David Cheneler, Tatiana Mishurova |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Scaffold Materials science Additive manufacturing Scanning electron microscope Chemie 02 engineering and technology 01 natural sciences Biomaterials Materialteknik 0103 physical sciences Ultimate tensile strength Composite material Elastic modulus lcsh:Mining engineering. Metallurgy X-ray computed tomography 010302 applied physics Finite element analysis Metals and Alloys Titanium alloy Powder removal Materials Engineering Compression testing 021001 nanoscience & nanotechnology Electron beam melting Finite element method Surfaces Coatings and Films Ceramics and Composites Fracture (geology) Deformation (engineering) 0210 nano-technology |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 2, Pp 1866-1881 (2020) |
| ISSN: | 2238-7854 |
| Popis: | An ultrasonic vibration post-treatment procedure was suggested for additively manufactured lattices. The aim of the present research was to investigate mechanical properties and the differences in mechanical behavior and fracture modes of Ti6Al4V scaffolds treated with traditional powder recovery system (PRS) and ultrasound vibration (USV). Scanning electron microscopy (SEM) was used to investigate the strut surface and the fracture surface morphology. X-ray computed tomography (CT) was employed to evaluate the inner structure, strut dimensions, pore size, as well as the surface morphology of additively manufactured porous scaffolds. Uniaxial compression tests were conducted to obtain elastic modulus, compressive ultimate strength and yield stress. Finite element analysis was performed for a body-centered cubic (BCC) element-based model and for CT-based reconstruction data, as well as for a two-zone scaffold model to evaluate stress distribution during elastic deformation. The scaffold with PRS post treatment displayed ductile behavior, while USV treated scaffold displayed fragile behavior. Double barrel formation of PRS treated scaffold was observed during deformation. Finite element analysis for the CT-based reconstruction revealed the strong impact of surface morphology on the stress distribution in comparison with BCC cell model because of partially molten metal particles on the surface of struts, which usually remain unstressed. Keywords: Additive manufacturing, Electron beam melting, Titanium alloy, Compression testing, Scaffold, Powder removal, Finite element analysis, X-ray computed tomography |
| Databáze: | OpenAIRE |
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