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Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium‐based alloy in simulated body fluid
Author(s) -
Bobby Kannan M.,
Singh Raman R.K.,
Witte F.,
Blawert C.,
Dietzel W.
Publication year - 2011
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31766
Subject(s) - materials science , magnesium alloy , simulated body fluid , alloy , magnesium , structural integrity , metallurgy , fatigue testing , composite material , structural engineering , engineering , scanning electron microscope
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. © 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2011.