Open Access

ARTICLE

Fatigue Properties of Ti-6Al-4V Subjected to Simulated Body Fluid

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1 Department of Mechanics and Engineering Science, Sichuan University, Chengdu, China
2 Luoyang LYC Bearing Co. Ltd, Luoyang, China
3 Department of Mechanics and Engineering Science, Sichuan University, Chengdu, China
4 Department of Mechanics and Engineering Science, Sichuan University, Chengdu, China

Structural Longevity 2009, 2(3), 169-175. https://doi.org/10.3970/sl.2009.002.169

Abstract

Fatigue properties of Ti-6Al-4V subjected to simulated body fluid (SBF) environment were presented in this paper. Using the ultrasonic fatigue testing technique, the ultra-high cycle fatigue properties of Ti-6Al-4V alloy subjection to SBF in two groups for two days and six days respectively in body temperature were studied and the initiation mechanisms of fatigue cracks were investigated and analyzed with scanning electron microscopy (SEM) and energy dispersive atomic X-ray (EDX). Then, a comparison with corresponding behaviors of the Ti-6Al-4V alloy with no treatment was made. The results show that, the S-N curves of the Ti- 6Al-4V alloy after subjection have the similar tendency with that with no treatment, that is, they descend continuously during 10⁴ and 10⁸ cycles and the descending tendency is lower in the region of 10⁷ -10⁸ cycles; the life of the specimens after subjection descends heavier before the fatigue life of 10⁷ cycles and is lower after the fatigue life of 10⁷ cycles than that with no treatment; the life of the specimens subjected for six days has little difference with that subjected for two days. Fatigue failure initiates from internal inclusion where mostly the element Al aggregates at the ultra-high cycle regime.

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