Microstructure, mechanical and corrosion properties of Mg-Dy-Gd-Zr alloys for medical applications
Microstructure, mechanical and corrosion properties of Mg-Dy-Gd-Zr alloys for medical applications
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DOI：
10.1016/j.actbio.2013.03.017
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发表时间：
2013-11-01
影响因子：
9.7
通讯作者：
Hort, N.
中科院分区：
文献类型：
--
作者：
Yang, L.;Huang, Y.;Hort, N.
在以往的研究中，镁-10Dy(wt.%)合金具有良好的耐腐蚀性和细胞相容性，显示出作为可生物降解植入材料的巨大潜力。然而，镁-10Dy合金的力学性能并不令人满意。为了满足不同医学应用所需的力学性能要求，研究了四种镁-10(Dy+Gd)-0.2Zr(wt.%)合金的显微组织、力学性能和腐蚀性能。随着Gd含量的增加，铸态合金中的第二相粒子数量增加，200℃时时效硬化响应增加。屈服强度增加，塑性降低，尤其是峰值时效合金中Gd的加入。此外，随着Gd含量的增加，由于电偶效应，铸态合金的腐蚀速率增加，但在固溶处理和时效条件下，所有合金的腐蚀速率相似(接近0.5 mm a(-1))。(C)2013 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
In previous investigations, a Mg-10Dy (wt.%) alloy with a good combination of corrosion resistance and cytocompatibility showed great potential for use as a biodegradable implant material. However, the mechanical properties of Mg-10Dy alloy are not satisfactory. In order to allow the tailoring of mechanical properties required for various medical applications, four Mg-10(Dy + Gd)-0.2Zr (wt.%) alloys were investigated with respect to microstructure, mechanical and corrosion properties. With the increase in Gd content, the number of second-phase particles increased in the as-cast alloys, and the age-hardening response increased at 200 degrees C. The yield strength increased, while the ductility reduced, especially for peak-aged alloys with the addition of Gd. Additionally, with increasing Gd content, the corrosion rate increased in the as-cast condition owing to the galvanic effect, but all the alloys had a similar corrosion rate (similar to 0.5 mm year(-1)) in solution-treated and aged condition. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.