Full text
| |
| Author(s): |
Flavia Farias Cardoso
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica |
| Defense date: | 2007-07-31 |
| Examining board members: |
Rubens Caram Junior;
Rezende Gomes dos Santos;
Ricardo Risso Chaves
|
| Advisor: | Peterson Luiz Ferrandini; Rubens Caram Junior |
| Abstract | |
This work presents an analysis of microstructure and mechanical properties of ß titanium alloys with additions of Mo and Zr, aiming the fabrication of orthopedic implants. The ß titanium alloys can be composed only by biocompatible elements and also present low Young's modulus, which is interesting for the health of the bone surrounding the implant. On the purpose of studying phase stability of Ti-Mo-Zr alloys, the effect of cooling rate when cooling from the ß field and the effect of composition on the microstructure, Vickers hardness and Young¿s modulus of Ti-Mo alloys were initially studied. Afterwards the effect of aging on the microstructure and the effect of Zr additions on the precipitation of ? phase in Ti-Mo alloys were also evaluated. The alloys were arc melted under an argon atmosphere, the ingots were hot swaged and hot rolled and the samples were conveniently heat treated. Characterization involved optical microscopy, scanning electron microscopy, X-ray diffraction, Vickers hardness and differential thermal analysis. The results allow one to identify the conditions of formation of stable and metastable phases, these latter ? and martensites. It was observed that the alloy Ti-15Mo, when water cooled presents 77 GPa, the lowest value of Young¿s modulus, the ? phase may be eliminated by means of aging and that the addition of 8% Zr to the alloy Ti-10Mo completely suppresses formation of the athermal ? phase without affecting significantly its elastic behaviour (AU) | |
| FAPESP's process: | 05/01469-6 - Phase transformations and aging effects in rapidly cooled Ti-Mo and Ti-Mo-Zr alloys |
| Grantee: | Flávia Farias Cardoso |
| Support Opportunities: | Scholarships in Brazil - Master |