Rakesh, K R and Bontha, Srikanth and Ramesh, M R and Das, Mitun and Balla, Vamsi Krishna (2020) Degradation, wettability and surface characteristics of laser surface modified Mg-Zn-Gd-Nd alloy. Journal of Materials Science-Materials in Medicine, 31 (5). Art No-42. ISSN 0957-4530

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Abstract

This work evaluates the effects of laser surface modification on Mg-Zn-Gd-Nd alloy which is a potential biodegradable material for temporary bone implant applications. The laser surface melted (LSM) samples were investigated for microstructure, wettability, surface hardness and in vitro degradation. The microstructural study was carried out using scanning and transmission electron microscopes (SEM, TEM) and the phases present were analyzed using X-ray diffraction. The in vitro degradation behaviour was assessed in hank's balanced salt solution (HBSS) by immersion corrosion technique and the effect of LSM process parameters on the wettability was analyzed through contact angle measurements. The microstructural examination showed remarkable grain refinement as well as uniform redistribution of intermetallic phases throughout the matrix after LSM. These microstructural changes increased the hardness of LSM samples with an increase in energy density. The wetting behaviour of processed samples showed hydrophilic nature when processed at lower (12.5 and 17.5 J/mm(2)) and intermediate energy density (22.5 and 25 J/mm(2)), which can potentially improve cell-materials interaction. The corrosion rate of as cast Mg-Zn-Gd-Nd alloy decreased by 83% due to LSM. GRAPHICS] .

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Bioceramics & Coating
Depositing User:	Bidhan Chaudhuri
Date Deposited:	05 Feb 2021 11:18
Last Modified:	05 Feb 2021 11:18
URI:	http://cgcri.csircentral.net/id/eprint/4932

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