Effects of Li on Microstructures, Mechanical, and Biocorrosion Properties of Biodegradable Mg94‐xZn2Y4Lix Alloys with Long Period Stacking Ordered Phase1 . Issue 3 (2nd November 2016)

• Record Type: Journal Article
• Authors: Zong, Ximei; Zhang, Jinshan; Liu, Wei; Chen, Jingai; Nie, Kaibo; Xu, Chunxiang
• Is Part Of: Advanced engineering materials. Volume 19:Issue 3(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-11-02
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201600606
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Mg94‐x Zn2 Y4 Lix 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 Y5 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 Mg89 Zn2 Y4 Li5 alloy has the lowest corrosion rate and the highest biocorrosion resistance, which are desirable for use as a biomaterial. Abstract : The UTS and elongation of Mg94‐x Zn2 Y4 Lix alloys with refined α‐Mg grains are improved as Li is 5 at% compared to Li‐free alloy . As a novel biomaterial, the Mg89 Zn2 Y4 Li5 alloy possesses superior mechanical performance, appropriate corrosion rate, and high biocorrosion resistance.