Repository hosted by TU Delft Library

Home · Contact · About · Disclaimer ·
 

Applicability of existing magnesium alloys as biomedical implant materials

Publication files not online:

Author: Erinc, M. · Sillekens, W.H. · Mannens, R.G.T.M. · Werkhoven, R.J.
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Magnesium Technology 2009, 15 February 2009 through 19 February 2009, San Francisco, CA, USA, Conference code: 76923, 209-214
Identifier: 242135
ISBN: 9780873397308
Keywords: Materials · Biodegradable implant · Corrosion · Magnesium alloy · Semi-solid processing · Industrial Innovation

Abstract

Being biocompatible and biodegradable, magnesium alloys are considered as the new generation biomedical implant materials, such as for stents, bone fixtures, plates and screws. A major drawback is the poor chemical stability of metallic magnesium; it corrodes at a pace that is too high for most prospective implant applications. Requirements for biodegradable implants are bio-compatibility, controlled biodegradability and sustainable mechanical properties. Various magnesium alloys containing Al, Zn, Y and rare-earth elements are analyzed in this respect. The alloys are compared on the basis of microstructure, tensile tests and potentio-dynamic polarization tests in simulated body fluid. The effects of semi-solid processing, hot extrusion, heat treatments and sterilization on corrosion resistance and tensile properties are investigated. AZ80 magnesium alloy with certain post-processing treatments fulfills the requirements best as a prospect implant material which has the potential for further improvement by trace alloying additions and surface modifications.