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Microstructure, mechanical properties and bio-corrosion properties of Mg–Si(–Ca, Zn) alloy for biomedical application ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
1902 94 2010 7 PDF Available
Title
Microstructure, mechanical properties and bio-corrosion properties of Mg–Si(–Ca, Zn) alloy for biomedical application ☆
Abstract

Mg–Si alloy was investigated for biomedical application due to the biological function of Si in the human body. However, Mg–Si alloy showed a low ductility due to the presence of coarse Mg2Si. Ca and Zn elements were used to refine and modify the morphology of Mg2Si in order to improve the corrosion resistance and the mechanical properties. The cell toxicity of Mg, Zn and Ca metals was assessed by an MTT test. The test results indicated that increasing the concentrations of Mg, Zn and Ca ions did not cause cell toxicity, which showed that the release of these three elements would not lead to cell toxicity. Then, microstructure, mechanical properties and bio-corrosion properties of as-cast Mg–Si(–Ca, Zn) alloys were investigated by optical microscopy, scanning electronic microscopy, mechanical properties testing and electrochemical measurement. Ca element can slightly refine the grain size and the morphology Mg2Si phase in Mg–Si alloy. The bio-corrosion resistance of Mg–Si alloys was improved by the addition of Ca due to the reduction and refinement of Mg2Si phase; however, no improvement was observed in the strength and elongation. The addition of 1.6% Zn to Mg–0.6Si can modify obviously the morphology of Mg2Si phase from course eutectic structure to a small dot or short bar shape. As a result, tensile strength, elongation and bio-corrosion resistance were all improved significantly; especially, the elongation improved by 115.7%. It was concluded that Zn element was one of the best alloying elements of Mg–Si alloy for biomedical application.

Keywords
Magnesium alloy; Microstructure; Mechanical properties; Bio-corrosion properties
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Microstructure, mechanical properties and bio-corrosion properties of Mg–Si(–Ca, Zn) alloy for biomedical application ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 5, May 2010, Pages 1756–1762
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us