Improved mechanical performance and delayed corrosion phenomena in biodegradable Mg-Zn-Ca alloys through Pd-alloying

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• 作者：S. Gonzá ; lezp>ap>p> ; p>p>Sergio.Gonzalez@uab.esp>p> ; p>p>sergiogsanchez10@yahoo.esp> ; E. Pellicerp>ap>p> ; p>p>Eva.Pellicer.icn@uab.catp> ; J. Fornellp>ap> ; A. Blanquerp>bp> ; L. Barriosp>bp> ; E. Ibá ; ñ ; ezp>bp> ; P. Solsonap>ap> ; S. Suriñ ; achp>ap> ; M.D. Baró ; p>ap> ; C. Nogué ; sp>bp> ; J. Sortp>cp>
• 关键词：Nanoindentation ; Biomaterial ; Corrosion ; Elastic properties
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：6
• 期：Complete
• 页码：53-62
• 全文大小：2459 K

文摘

The influence of partial substitution of Mg by Pd on the microstructure, mechanical properties and corrosion behaviour of Mg_72?em>xZn₂₃Ca₅Pd_x?(x=0, 2 and 6 at. % ) alloys, synthesized by copper mould casting, is investigated. While the Mg₇₂Zn₂₃Ca₅ alloy is mainly amorphous, the addition of Pd decreases the glass-forming ability, thus favouring the formation of crystalline phases. From a mechanical viewpoint, the hardness increases with the addition of Pd, from 2.71?GPa for x=0 to 3.9?GPa for x=6, mainly due to the formation of high-strength phases. In turn, the wear resistance is maximized for an intermediate Pd content (i.e., Mg₇₀Zn₂₃Ca₅Pd₂). Corrosion tests in a simulated body fluid (Hank¡¯s solution) indicate that Pd causes a shift in the corrosion potential towards more positive values, thus delaying the biodegradability of this alloy. Moreover, since the cytotoxic studies with mouse preosteoblasts do not show dead cells after culturing for 27?h, these alloys are potential candidates to be used as biomaterials.