Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid

Kannan, M. Bobby, Raman, R.K. Singh, Witte, F., Blawert, C., and Dietzel, W. (2011) Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 96B (2). pp. 303-309.

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Abstract

Applications of magnesium alloys as biodegradable orthopaedic implants are critically dependent on the mechanical integrity of the implant during service. In this study, the mechanical integrity of an AZ91 magnesium alloy was studied using a constant extension rate tensile (CERT) method. The samples in two different geometries that is, circumferentially notched (CN), and circumferentially notched and fatigue cracked (CNFC), were tested in air and in simulated body fluid (SBF). The test results show that the mechanical integrity of the AZ91 magnesium alloy decreased substantially (∼50%) in both the CN and CNFC samples exposed to SBF. Fracture surface analysis revealed secondary cracks suggesting stress corrosion cracking susceptibility of the alloy in SBF.

Item ID: 15913
Item Type: Article (Refereed Research - C1)
Keywords: magnesium alloys; biodegradable implant; mechanical integrity; stress corrosion cracking; simulated body fluid
ISSN: 1552-4981
Date Deposited: 08 Jun 2011 00:39
FoR Codes: 09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 100%
SEO Codes: 86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified @ 100%
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