Journal
ENGINEERING FRACTURE MECHANICS
Volume 201, Issue -, Pages 47-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2018.09.002
Keywords
Magnesium alloy; Stress corrosion cracking; Hydrogen embrittlement; Anodic dissolution
Categories
Funding
- Monash University
- Department of Mechanical & Aerospace Engineering at Monash University
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Magnesium (Mg) alloys are attractive candidate materials for resorbable implants including cardiovascular and orthopaedic medical devices e.g., scents and bone plates/screws. Bioresorbable implants provide a temporary support for the malfunctioned tissue/bone to heal and then completely degrade in the body. In such uses the implant material must possesses an adequate resistance to cracking such as corrosion-assisted-cracking fractures including stress corrosion cracking (SCC) and corrosion fatigue (CF). This study evaluates SCC of an extruded Mg alloy, ZK21, using slow strain rate tensile (SSRT) testing at a strain rate of 3.1 x 10(-7) in modified simulated body fluid (m-SBF) at 37 degrees C. SCC tests under different electrochemical conditions suggest that the alloy is susceptible to SCC with a substantial decrease in mechanical properties.
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