2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 3: Non-ferrous & Iron_Steel
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 522 pages |
| ISBN: | 978-1-987820-05-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The effect of heat treatment on the microstructure and the mechanical
Julia Mirza Rosca1; Domingo Herrera Santana1; Oscar Martel Fuentes1;1UNIVERSITY OF LAS PALMAS DE GRAN CANARIA, Las Palmas de Gran Canaria, Spain;
Type of Paper: Regular
Id Paper: 58
Topic: 3
Abstract:
The titanium alloy Ti-6Al-4V has been extensively used as biomedical implant in the recent decades. Although it has an excellent reputation for corrosion resistance and biocompatibility, considerable controversy has been raised over the long-term performance. Further studies have shown that the release of both Al and V ions from the alloy might cause long-term health problems, such as: osteomalacia, neuropathy and Alzheimer diseases. Vanadium is associated with potential cytotoxic effects and adverse tissue reactions, and Aluminium produces potential neurological disorders. The alloy with aluminium and niobium occurs to be more suitable for implant applications. Ti-6Al-7Nb alloy possesses similar or better corrosion resistance and mechanical properties than those of Ti-6Al-4V alloy. Moreover, this alloy has no toxicity. In soft tissue, aluminium and niobium, similar as aluminium and iron show a reaction of "sequestration", namely the formation of connective tissue membrane around the implant.
It was found that titania with specific structure of anastase and rutile possesses a high bioactive characteristic; this result implies the possibility of preparation of more active titanium by oxidation in air at high temperatures.
The aim of the paper is to study the effect of heat treatment on the mechanical properties and surface characteristics of Ti-6Al-7Nb. Data about mechanical behaviour is presented. The mechanical behaviour was determined using optical metallography, Scanning Electron Microscopy, Tensile strength, microhardness and ultramicrohardness. It resulted that the tested oxide films presented passivation tendency and a very good stability. The pronounced porous oxide layer obtained by heat treatment may be expected to facilitate the incorporation of mineral ions from biological fluids and to improve the bioactive bonding with the living bone.