Effect of filler morphology on mechanical behaviour of Mg/HA nanocomposites for degradable implant applications

Magnesium (Mg) alloys exhibit promising potential for biodegradable orthopaedic applications, with the incorporation of hydroxyapatite (HA), which offers a means to tailor their bioactivity and biodegradation behavior. In this study, the effect of filler morphology on mechanical behaviour and biocor...

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Bibliographic Details
Published in:Materials research express 2024-10, Vol.11 (10), p.105403
Main Authors: V A, Jasir, Vaisakh, P, Pratheeshkumar, V, Paul, Parokkaran Jojo, Sajith Babu, C, T, Hanas, Rabeeh, VP Muhammad
Format: Article
Language:English
Subjects:
Bacterial corrosion
Biodegradation
Biological activity
biomaterial
Compressive strength
Fillers
Flakes
Hydroxyapatite
Magnesium
magnesium composite
Mechanical properties
metal matrix composite
Metal matrix composites
Morphology
Nanocomposites
Orthopedics
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Summary:Magnesium (Mg) alloys exhibit promising potential for biodegradable orthopaedic applications, with the incorporation of hydroxyapatite (HA), which offers a means to tailor their bioactivity and biodegradation behavior. In this study, the effect of filler morphology on mechanical behaviour and biocorrosion of the Mg/HA composites is analysed. Two distinct morphologies of nano-hydroxyapatite (nHA), needle-like and flake-shaped, were incorporated into Mg using a stir-casting technique. The incorporation of nHA led to a notable increase in hardness, with enhancements of 15% for needle-like nHA and 29% for flake-like nHA. Moreover, the ultimate compressive strength exhibited a significant improvement of 29% for the flake-shaped nHA and 12% for the needle-like nHA. Interestingly, the morphological variation did not impact the degradation behaviour of the composites. Based on these findings, it is proposed that Mg metal matrix composites utilizing bioactive flake-shaped nHA as a filler material hold promise for enhancing the mechanical properties of Mg/HA nanocomposites, particularly for load-bearing implant applications.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ad8730