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

被引：44

作者：

Kannan, M. Bobby ^{[1
,2
]}

Raman, R. K. Singh ^{[2
]}

Witte, F. ^{[3
]}

Blawert, C. ^{[4
]}

Dietzel, W. ^{[4
]}

机构：

[1] James Cook Univ, Discipline Chem Engn, Sch Engn & Phys Sci, Townsville, Qld 4811, Australia

[2] Monash Univ, Dept Mech & Aerosp Engn, Melbourne, Vic 3800, Australia

[3] Hannover Med Sch, Lab Biomech & Biomat, D-30625 Hannover, Germany

[4] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

来源：

JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS | 2011年 / 96B卷 / 02期

关键词：

magnesium alloys; biodegradable implant; mechanical integrity; stress corrosion cracking; simulated body fluid; STRESS-CORROSION CRACKING; SUSCEPTIBILITY;

D O I：

10.1002/jbm.b.31766

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

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 (similar to 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. (C) 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 96B: 303-309, 2011.

引用

页码：303 / 309

页数：7

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