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Microstructure, mechanical and corrosion properties of Mg–Zn–Sr–Ca alloys for use as potential biodegradable implant materials
Corrosion Engineering, Science and Technology ( IF 1.8 ) Pub Date : 2020-08-06 , DOI: 10.1080/1478422x.2020.1804094
Xiang Meng 1 , Xiaoqing Liao 1 , Zhongtao Jiang 1 , Hua Tang 1 , Shijie Zhu 2 , Shaokang Guan 2
Affiliation  

ABSTRACT Effects of Ca addition on as-cast microstructure, mechanical and corrosion properties of Mg–2Zn–0.3Sr alloy were investigated for biodegradable implant application. First, a comparison between Ca and Sr addition in Mg–2Zn alloy was studied. Mg–2Zn–0.3Sr showed the better corrosion performance, but the worse mechanical property. Then, the results of Ca addition indicated that the dendritic phases dispersed in the Mg matrix. The grains became smaller as Ca content increased. The ultimate tensile strength of Mg–2Zn–0.3Sr–0.3Ca alloy was strengthened to about 170MPa, along with a good ductility of 10%, due to the refinement of grains and homogenous morphology. The ternary alloy had the lowest degradation rate. Mg–2Zn–0.3Sr–0.3Ca still presented a considerable corrosion resistance. 0.5wt% Ca addition brought more and coarser second phases, and worse mechanical and corrosion property. It is suggested that minor addition of Ca (0.1–0.3wt%) in Mg–2Zn–0.3Sr alloy would benefit the practical performance for use in biodegradable implants.

中文翻译:

用作潜在可生物降解植入材料的 Mg-Zn-Sr-Ca 合金的显微结构、机械和腐蚀性能

摘要 研究了 Ca 添加对可生物降解植入物应用的 Mg-2Zn-0.3Sr 合金铸态组织、力学和腐蚀性能的影响。首先,研究了 Mg-2Zn 合金中 Ca 和 Sr 添加量的比较。Mg-2Zn-0.3Sr 表现出较好的腐蚀性能,但机械性能较差。然后,Ca 添加的结果表明枝晶相分散在 Mg 基体中。随着Ca含量的增加,晶粒变小。由于晶粒细化和形态均匀,Mg-2Zn-0.3Sr-0.3Ca 合金的极限抗拉强度增强到约 170MPa,同时具有 10% 的良好延展性。三元合金的降解率最低。Mg-2Zn-0.3Sr-0.3Ca 仍然表现出相当大的耐腐蚀性。添加 0.5wt% Ca 带来更多和更粗的第二相,机械性能和腐蚀性能更差。建议在 Mg-2Zn-0.3Sr 合金中添加少量 Ca (0.1-0.3wt%) 将有利于用于可生物降解植入物的实际性能。
更新日期:2020-08-06
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