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Effects of Li on Microstructures, Mechanical, and Biocorrosion Properties of Biodegradable Mg 94‐x Zn 2 Y 4 Li x Alloys with Long Period Stacking Ordered Phase
Author(s) -
Zong Ximei,
Zhang Jinshan,
Liu Wei,
Chen Jingai,
Nie Kaibo,
Xu Chunxiang
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600606
Subject(s) - materials science , microstructure , eutectic system , ultimate tensile strength , metallurgy , alloy , precipitation , phase (matter) , corrosion , magnesium , biomaterial , elongation , magnesium alloy , grain size , nanotechnology , chemistry , physics , organic chemistry , meteorology
Mg 94‐x Zn 2 Y 4 Li x alloys (at%) (x = 0, 1, 5, 9, 13) are designed to develop a novel, biodegradable magnesium alloy. Microstructures evolution and mechanical properties are evaluated by using OM, XRD, SEM, and tensile tests. The biocorrosion behaviors of the alloys are investigated by using hydrogen evolution and electrochemical measurements. The precipitation of 18R LPSO phase is facilitated by a little Li (<1 at%), while exceeded Li (>1 at%) inhibits the formation of 18R LPSO phase and favors the formation of (Mg,Zn) 24 Y 5 eutectic phase. The grain size of α‐Mg phase is refined with 5 at% Li. Besides the optimal combined mechanical properties (UTS = 190 MPa, elongation = 3.1%), the as‐cast Mg 89 Zn 2 Y 4 Li 5 alloy has the lowest corrosion rate and the highest biocorrosion resistance, which are desirable for use as a biomaterial.