Effect of Minor Yttrium on Microstructure and Mechanical Properties of Bioimplant Mg-5Zn Alloy

被引:6
作者
Jafari, H. [1 ]
Rahimi, F. [1 ]
Sheikhsofla, Z. [1 ]
Khalilnezhad, M. [1 ]
机构
[1] Shahid Rajaee Teacher Training Univ, Fac Mat Engn & Modern Technol, Mat Engn Dept, Tehran 16785136, Iran
关键词
biomaterial; hardness; magnesium alloy; microstructure; tensile test; yttrium; VITRO CORROSION BEHAVIOR; ZN-Y ALLOYS; MG-ZN; AS-CAST; PHASE-FORMATION; W-PHASE; MAGNESIUM; STRENGTH;
D O I
10.1007/s11665-017-3007-x
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper explores cast Mg-5Zn alloy, containing small amounts of yttrium (Y: 0.1-1.5 wt.%), through microstructure evaluation and tensile and hardness tests. The results reveal that addition of Y to the alloy refines microstructure, especially when secondary phases, Mg3Zn6Y (I) and Mg3Zn3Y2 (W), form. I-phase is detected when 0.3 wt.% Y is added to the alloy, while W-phase is only observed in Mg-5Zn-1.5Y alloy. The results also show that the addition of Y improves yield and tensile strength as well as the hardness value of the Mg-5Zn alloy at the expense of its formability. The three effects of the solid solution of Y in alpha-Mg, grain refinement, and the formation of I- and W-phases are the reasons for such behavior. The improvement is more pronounced when W-phase appears in the microstructure. In other words, Mg-5Zn-1.5Y alloy behaves stronger and harder than other alloys and may be considered as a potential candidate for bioimplant applications if its degradation behavior meets the requirements.
引用
收藏
页码:5590 / 5598
页数:9
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