Surface Modifications of Biomedical Gum-Metal-Type Alloy by Nano Surface—Severe Plastic Deformation

For developing performant metallic materials for medical implants, biomechanical adaptation is important for both the bulk material and the material’s surface. Therefore, a nano surface-severe plastic deformation (NS-SPD) treatment was applied on the surface of a gum-type alloy (Ti-Nb-Zr-Fe-O) with...

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Bibliographic Details
Published in:JOM (1989) 2019-11, Vol.71 (11), p.4114-4124
Main Authors: Raducanu, Doina, Cojocaru, Vasile Danut, Nocivin, Anna, Cinca, Ion, Serban, Nicolae, Cojocaru, Elisabeta Mirela
Format: Article
Language:English
Subjects:
Biocompatibility
Biomechanics
Biomedical materials
Chemistry/Food Science
Compressed air
Deformation
Earth Sciences
Electron backscatter diffraction
Engineering
Environment
Homogeneity
Iron
Mechanical properties
Medical materials
Metal fatigue
Microstructural analysis
Microstructure Evolution During Deformation Processing
Niobium
Oxidation
Physics
Plastic deformation
Process parameters
Surface layers
Surgical implants
Thermomechanical treatment
Thin films
Titanium alloys
Titanium oxides
Transplants & implants
Zirconium
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Summary:For developing performant metallic materials for medical implants, biomechanical adaptation is important for both the bulk material and the material’s surface. Therefore, a nano surface-severe plastic deformation (NS-SPD) treatment was applied on the surface of a gum-type alloy (Ti-Nb-Zr-Fe-O) with enhanced bulk mechanical biocompatibility. Six variants with different processing parameters were tested using small impact balls accelerated by compressed air. Before the NS-SPD treatment, the alloy was first subjected to thermomechanical processing to achieve a high compositional and structural homogeneity and proper mechanical properties of the core structure. A detailed microstructural analysis was performed on the thermomechanical-processed alloy and on the surface areas. The microstructural analysis (based on scanning electron microscopy electron backscatter diffraction and x-ray diffraction) reveals the influence of the NS-SPD treatment by formation of two different surface layers: an outer, very thin layer, approximately 10 μm in width, formed of titanium oxides as a consequence of surface oxidation during ball impacts in an air atmosphere, and one approximately 100 μm to 250 μm in width, representing a zone of high-density microstructural defects.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-019-03667-6