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Biocorrosion and biodegradation behavior of ultralight Mg-4Li-1Ca (LC41) alloy in simulated body fluid for degradable implant applications

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Title Biocorrosion and biodegradation behavior of ultralight Mg-4Li-1Ca (LC41) alloy in simulated body fluid for degradable implant applications
 
Creator NENE, SS
KASHYAP, BP
PRABHU, N
ESTRIN, Y
AL-SAMMAN, T
 
Subject MAGNESIUM-LITHIUM ALLOYS
IN-VITRO DEGRADATION
MG-CA ALLOYS
MECHANICAL-PROPERTIES
CORROSION-RESISTANCE
MICROSTRUCTURE
REFINEMENT
EXTRUSION
VIVO
 
Description Biocorrosion and biodegradation behavior of Mg-4Li-1Ca alloy were investigated for industrially important end product conditions, namely the homogenized, rolled, and rolled + annealed ones. Among the three, homogenized material showed the highest corrosion rate (27.2 mm/year) in a simulated body fluid (SBF) owing to its coarse grain structure containing long dumbbell-shaped eutectic phase. Rolled + annealed material exhibited the lowest corrosion rate (0.94 mm/year) corresponding to the highest corrosion resistance (1.854 k Omega cm(2)) in SBF. This higher corrosion resistance is associated with a uniform distribution of corrosion sites and a lower occurrence of twins in the microstructure. However, the rolled material showed a greater corrosion rate due to an appreciable volume fraction of {101} compression twins, {102} tension twins, and {101}-{102} double twins, which form galvanic couples with the adjacent grains that enhances localized corrosion. A mechanism of biodegradation at the alloy/SBF interface is proposed. It involves the formation of bone-like hydroxyapatite and metastable octa calcium phosphate, along with other degradation products, such as magnesium hydroxide and lithium hydroxide.
 
Publisher SPRINGER
 
Date 2016-01-14T12:06:46Z
2016-01-14T12:06:46Z
2015
 
Type Article
 
Identifier JOURNAL OF MATERIALS SCIENCE, 50(8)3041-3050
0022-2461
1573-4803
http://dx.doi.org/10.1007/s10853-015-8846-y
http://dspace.library.iitb.ac.in/jspui/handle/100/17455
 
Language en