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Impact of Microstructural and Surface Modifications on the Ti-45Nb Alloy’s Response to Bio-Environment

Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1215-1230页

作者： Ivana Cvijović-Alagić Slađana Laketić MilošMomčilović Jovan Ciganović jelena bajat Vesna Kojić Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia University of BelgradeMike Petrovića Alasa 12-1411000BelgradeSerbia Faculty of Technology and Metallurgy University of BelgradeKarnegijeva 411000BelgradeSerbia Oncology Institute of Vojvodina Faculty of MedicineUniversity of Novi SadPut Doktora Goldmana 4Sremska Kamenica21204Sremska KamenicaSerbia

The Ti-45Nb (mass%) alloy’s corrosive and biocompatible response in simulated physiological conditions was investigated before and after its additional high-pressure torsion (HPT) and laser irradiation processing. The grain size reduction from 2.76 µm to ~ 200 nm and the appearance of laser-induced morphologically altered and highly oxidized surface led to the significant improvement of alloy corrosion resistance and cell–implant interaction. Moreover, an additional increase of the laser pulse energy from 5 to 15 mJ during the alloy irradiation in the air led to an increase in the surface oxygen content from 13.64 to 23.89% accompanied by an increase of excellent cell viability from 127.18 to 134.42%. As a result of the controlled alloy microstructural and surface modifications, the formation of protective bi-modal mixed Ti- and Nb-oxide external scale was enabled. The presence of this surface oxide scale enhanced the alloy’s resistance to corrosion deterioration and simultaneously boosted cell viability and proliferation.

关键词： Ti-45Nb alloy High-pressure torsion Laser surface scanning Corrosion resistance Biocompatible properties

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Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiC_p composites in sodium chloride solution

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Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1512-1521页

作者： Biljana BOBIC jelena bajat Ilija BOBIC Bore JEGDIC Institute of Chemistry Technology and Metallurgy University of Belgrade Belgrade 11000 Serbia Faculty of Technology and Metallurgy University of Belgrade Belgrade 11000 Serbia "Vinca" Institute of Nuclear Sciences University of Belgrade Belgrade 11000 Serbia

The influence of corrosion on the surface appearance and microstructure of particulate ZA27/SiCp composites was examined after 30 d immersion in a sodium chloride solution with the access of atmospheric oxygen. The composites with different contents of SiC micro-particles were synthesized via compo casting. Microstructural studies by means of optical microscopy （OM） and scanning electron microscopy （SEM） showed that corrosion occurred in the composite matrices, preferentially in regions of the η phase, rich in zinc. The corrosion processes did not affect the silicon carbide particles incorporated in the matrix alloy. According to the results of electrochemical polarization measurements, an increase in the content of SiC particles in the composite matrice has led to the lower corrosion resistance in the composites.

关键词： metal-matrix composites ZA27 alloy corrosion microstructure polarization resistance corrosion rate

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Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 931-941页

作者： Biljana BOBIC jelena bajat Zagorka ACIMOVIC-PAVLOVIC Ilija BOBIC Bore JEGDIC Institute"Gosa" University of BelgradeMilana Rakica 3511000 BelgradeSerbia Faculty of Technology and Metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia "Vinca"Institute of Nuclear Sciences University of BelgradeMike Petrovica Alasa 12-1411001 BelgradeSerbia

The influence of corrosion on the microstructure of thixoformed and heat-treated ZA27 alloys was investigated. The microstructure of ZA27 alloy was affected by heat treatment. The process of electrochemical corrosion occurs in both ZA27 alloys through the area of r/phase. According to the results of immersion test and electrochemical measurements, the corrosion rate of the thixoformed ZA27 alloy is at least 50% lower than that of the thixoformed and thermally processed alloy. This indicates the unfavourable influence of applied heat treatment （T4 regime） on the corrosion resistance of the thixoformed ZA27 alloy.

关键词： ZA27 alloy thixoforming corrosion heat treatment microstructure

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