Influence of Heat Treatment on Fatigue Resistance of Sintered Ti 35Nb 7Zr 5Ta β Alloy

Abstract:

Mean stress on fatigue strength of Ti-35Nb-7Zr-5Ta, used in the manufacture of orthopedic prosthesis, was evaluated. Samples of Ti-35Nb-7Zr-5Ta were pressureless sintered and tested using microhardness (Vickers) and four point bending fatigue apparatus. Characterization was carried out using optical microscopy, scanning electron microscopy, EDS analysis, oxygen analysis and density. The density analysis shows almost 98% of density and microscopy reveals some precipitates of α phase and presumably ω phase at the grain and grain boundaries. The bending fatigue resistance limit reached (Se (10⁶) 88 MPa), due to, presumably, the influence of coarse α phase precipitates at grain boundaries as well as the high oxygen content in the material after sintering (0.96 %). In this study, Kwofie model best explains the influence of mean stress on fatigue strength of this alloy.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1290-1297
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1290
• Online since: June 2014
• Authors: Alexander H. Franco, Cosme Roberto Moreira Silva*, Palloma V. Muterlle, Jorge L.A. Ferreira, José A. Araújo
• Keywords: Four Point Bending Fatigue, Powder metallurgy, TI-35Nb-7Zr-5Ta

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