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3. Optimizing Suitable Mechanical Properties for a Biocompatible Beta-Titanium Alloy by Combining Plastic Deformation with Solution Treatment.

Author

Irimescu, Raluca Elena, Raducanu, Doina, Nocivin, Anna, Cojocaru, Elisabeta Mirela, Cojocaru, Vasile Danut, and Zarnescu-Ivan, Nicoleta

Abstract

The microstructural and mechanical features were investigated for the alloy Ti-36.5Nb-4.5Zr-3Ta-0.16O (wt.%) subjected to thermo-mechanical processing consisting of a series of hot and cold rolling combined with solution treatments with particular parameters. The objective was to find the optimal thermo-mechanical treatment variant to improve the mechanical properties, and namely, to increase the yield tensile strength (YTS) and the ultimate tensile strength (UTS), with a low modulus of elasticity and with an adequate ductility in order to obtain a good biomaterial appropriate for use in hard tissue implants. X-ray diffraction and SEM microscopy served to investigate the microstructural features: the type of formed phases with their morphology, dimensions, and distribution. The experimental alloy presented mainly a β-phase with some α″-Ti martensitic phase in particular stages of the processing scheme. The main mechanical properties were found by applying a tensile test, from which were determined the yield tensile strength [MPa], the ultimate tensile strength [MPa], Young's modulus of elasticity [GPa], and the elongation to fracture (%). [ABSTRACT FROM AUTHOR]

Published
2024
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7. Characterization of a Biodegradable Mg-Alloy after SLM Processing

Author

Raducanu, Doina, primary, Cojocaru, Vasile Danut, additional, Nocivin, Anna, additional, Drob, Silviu Iulian, additional, Hendea, Radu Emil, additional, Stanciu, Doina, additional, Ivanescu, Steliana, additional, Raducanu, Vlad Andrei, additional, Serban, Nicolae, additional, Cojocaru, Elisabeta Mirela, additional, and Campian, Radu Septimiu, additional

Published
2024
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10. The Characterization of a Biodegradable Mg Alloy after Powder Bed Fusion with Laser Beam/Metal Processing for Custom Shaped Implants.

Author

Raducanu, Doina, Cojocaru, Vasile Danut, Nocivin, Anna, Drob, Silviu Iulian, Hendea, Radu Emil, Stanciu, Doina, Ivanescu, Steliana, Raducanu, Vlad Andrei, Serban, Nicolae, Cojocaru, Elisabeta Mirela, and Campian, Radu Septimiu

Subjects
*MECHANICAL alloying, *LASER fusion, *LASER beams, *MAGNESIUM alloys, *ALLOY powders, *BIOABSORBABLE implants, *COMPACT bone, *YOUNG'S modulus
Abstract

A new Mg-Zn-Zr-Ca alloy in a powder state, intended to be used for custom shaped implants, was obtained via a mechanical alloying method from pure elemental powder. Further, the obtained powder alloy was processed by a PBF-LB/M (powder bed fusion with laser beam/of metal) procedure to obtain additive manufactured samples for small biodegradable implants. A series of microstructural, mechanical and corrosion analyses were performed. The SEM (scanning electron microscopy) analysis of the powder alloy revealed a good dimensional homogeneity, with a uniform colour, no agglutination and almost rounded particles, suitable for the powder bed fusion procedure. Further, the PBF-LB/M samples revealed a robust and unbreakable morphology, with a suitable porosity (that can reproduce that of cortical bone) and without an undesirable balling effect. The tested Young's modulus of the PBF-LB/M samples, which was 42 GPa, is close to that of cortical bone, 30 GPa. The corrosion tests that were performed in PBS (Phosphate-buffered saline) solution, with three different pH values, show that the corrosion parameters have a satisfactory evolution comparative to the commercial ZK 60 alloy. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Biodegradable Magnesium Alloys for Personalised Temporary Implants

Author

Hendea, Radu Emil, primary, Raducanu, Doina, additional, Claver, Adrián, additional, García, José Antonio, additional, Cojocaru, Vasile Danut, additional, Nocivin, Anna, additional, Stanciu, Doina, additional, Serban, Nicolae, additional, Ivanescu, Steliana, additional, Trisca-Rusu, Corneliu, additional, and Campian, Radu Septimiu, additional

Published
2023
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17. Laser Powder Bed Fusion Applied to a New Biodegradable Mg-Zn-Zr-Ca Alloy

Author

Hendea, Radu Emil, primary, Raducanu, Doina, additional, Nocivin, Anna, additional, Ivanescu, Steliana, additional, Stanciu, Doina, additional, Trisca-Rusu, Corneliu, additional, Campian, Radu Septimiu, additional, Drob, Silviu Iulian, additional, Cojocaru, Vasile Danut, additional, and Gălbinașu, Bogdan Mihai, additional

Published
2022
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29. Graphene nanoplatelets-sericin surface-modified Gum alloy for improved biological response

Author

Mitran, Valentina, primary, Dinca, Valentina, additional, Ion, Raluca, additional, Cojocaru, Vasile D., additional, Neacsu, Patricia, additional, Dinu, Cerasela Zoica, additional, Rusen, Laurentiu, additional, Brajnicov, Simona, additional, Bonciu, Anca, additional, Dinescu, Maria, additional, Raducanu, Doina, additional, Dan, Ioan, additional, and Cimpean, Anisoara, additional

Published
2018
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43. X-RAY DIFFRACTION OF A Ti-Zr-Nb-Ta ALLOY PROCESSED BY ACCUMULATIVE ROLL BONDING (ARB).

Author

Cinca, Ion, Vulcan, Andreea Daniela, Raducanu, Doina, and Cojocaru, Danut-Vasile

Subjects
X-ray diffraction, TANTALUM alloys, MECHANICAL properties of metals, MOLECULAR structure, BIOMEDICAL materials, DEFORMATIONS (Mechanics), CHEMICAL sample preparation, STRENGTH of materials
Abstract

The mechanical and structural properties of a biomedical a + β titanium alloy, Ti-10Zr-5Nb-5Ta (%w), were enhanced through severe plastic deformation using the accumulative roll bonding (ARB) technique. The obtained ultrafine structures revealed promising mechanical and structural characteristics. Samples consisting 2, 4, and 8 layers resulted after 2, 3, and respectively 4 cycles ARB. The chemical analysis of the samples was accomplished by the microstructural evaluation by scanning electron microscopy and X-ray diffraction. The mechanical tests were: tensile strength. Mechanical and physical properties are changed dramatically by cold working. The results allowed characterizing the alloy as a α + β type and showed ultra fine grain (UFG) structure. [ABSTRACT FROM AUTHOR]

Published
2012

44. DESIGN AND EXPERIMENTATION OF A TITANIUM ALLOY NEW TYPE IMPLANT WITH NANOSTRUCTURED SURFACES.

Author

Raducanu, Doina, Nocivin, Anna, Lopez, Augustin Santana, Rosca, Julia Marza, Forleo, Donato Monopoli, Grau-Bassas, Enrique Rodriguez, Martin, David Gonzalez, Cojocaru, Vasile-Danut, and Cinca, Ion

Subjects
TITANIUM alloys, NANOSTRUCTURED materials, BIOMEDICAL materials, BIOMEDICAL engineering, ARTIFICIAL implants
Abstract

The development of implant / tissue-engineering strategies into clinical therapeutic protocols requires extensive, preclinical experimentation in appropriate animal models. The major considerations facing any implant / tissue-engineering testing logic include the choice of the defect, selection of the optimal biomaterial for the implant, capable of high biocompatible properties, selection of the animal, the age of the animal, the anatomic site, the size of the lesion, and most important, the micro-mechanical environment. Regarding these considerations, present paper refers to some researches effectuated in the frame of a scientific project which has in view the obtaining of new metallic biomaterials from a Ti-Al-Nb alloy, with different HA-type coatings, and also the design and realization of new special knee implant together with a selection of a suitable animal model for preclinical experimentation of the implants. [ABSTRACT FROM AUTHOR]

Published
2010

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