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Open AccessArticle

Mechanism of Fatigue Crack Growth in Biomedical Alloy Ti-27Nb

Department of Mechanical Engineering, International Islamic University Islamabad, Islamabad 44000, Pakistan
Aerospace Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Skudai, Johor 81310, Malaysia
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2299;
Received: 1 March 2020 / Revised: 13 March 2020 / Accepted: 19 March 2020 / Published: 16 May 2020
(This article belongs to the Special Issue Alloys for Biomedical Application)
Implants are widely used in the human body for the replacement of affected bones. Fatigue failure is one of the serious concerns for implants. Therefore, understanding of the underlying mechanism leading to fatigue failure is important for the longevity of biomaterial implants. In this paper, the fracture toughness and fatigue crack growth of titanium alloy biomaterial Ti-27Nb has been experimentally investigated. The Ti-27Nb material is tested for fatigue crack growth in different environmental conditions representing the ambient and in vitro environments for 504 hours and 816 hours, respectively. Fractography of the tested specimen is conducted using Scanning Electron Microscope (SEM). The results of the fatigue crack growth propagation of the ambient and in vitro samples are similar in the Paris crack growth region. However, in the threshold region, the crack growth rate is higher for the Simulated Body Fluid (SBF) treated specimen. The fracture surface morphology of in vitro samples shows brittle fracture as compared to ambient specimens with significant plasticity and striations marks. It is proposed that a similar investigation may be conducted with specimens treated in SBF for prolonged periods to further ascertain the findings of this study. View Full-Text
Keywords: Titanium alloys; microstructure; fracture toughness; fatigue crack growth behavior; simulated body fluid Titanium alloys; microstructure; fracture toughness; fatigue crack growth behavior; simulated body fluid
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Amjad, M.; Badshah, S.; Rafique, A.F.; Adil Khattak, M.; Khan, R.U.; Abdullah Harasani, W.I. Mechanism of Fatigue Crack Growth in Biomedical Alloy Ti-27Nb. Materials 2020, 13, 2299.

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