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

Journal Article · Wed Nov 15 04:00:00 EST 2017 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-017-3007-X· OSTI ID:22860774

Rahimi, F.; Sheikhsofla, Z.; Khalilnezhad, M. ^[1]

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1. Shahid Rajaee Teacher Training University, Materials Engineering Department, Faculty of Materials Engineering and Modern Technologies (Iran, Islamic Republic of)

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, Mg{sub 3}Zn{sub 6}Y (I) and Mg{sub 3}Zn{sub 3}Y{sub 2} (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 α-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.

• OSTI ID: 22860774
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 11 Vol. 26; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN REFINEMENT
HARDNESS
IMPLANTS
MAGNESIUM ALLOYS
MICROSTRUCTURE
SOLID SOLUTIONS
TENSILE PROPERTIES
YTTRIUM ADDITIONS
ZINC COMPOUNDS