Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 6    June 2016

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Microstructure, mechanical and bio-corrosion properties of as-extruded Mg-Sn-Ca alloys
Chao-yong ZHAO1, Fu-sheng PAN1,2,3, Hu-cheng PAN4

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
3. Chongqing Academy of Science and Technology, Chongqing 401123, China;
4. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
Northeastern University, Shenyang 110819, China

Abstract:The as-extruded Mg-Sn-Ca alloys were prepared and investigated for orthopedic applications via using optical microscopy, scanning electron microscopy, X-ray diffraction, as well as tensile, immersion and electrochemical tests. The results showed that, with the addition of 1% Sn and the Ca content of 0.2%-0.5%, the microstructure of the as-extruded Mg-Sn-Ca alloys became homogenous, which led to increased mechanical properties and improved corrosion resistance. Further increase of Ca content up to 1.5% improved the strength, but deteriorated the ductility and corrosion resistance. For the alloy containing 0.5% Ca, when the Sn content increased from 1% to 3%, the ultimate tensile strength increased with a decreased corrosion resistance, and the lowest yield strength and ductility appeared with the Sn content of 2%. These behaviors were determined by Sn/Ca mass ratio. The analyses showed that as-extruded Mg-1Sn-0.5Ca alloy was promising as a biodegradable orthopedic implant.

 

Key words: magnesium alloy; Mg-Sn-Ca alloy; biodegradation; orthopedic implant; microstructure; mechanical properties; corrosion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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