Effect of corrosion on mechanical behaviors of Mg--Zn--Zr alloy in simulated body fluid

doi:10.1007/s11706-014-0258-4

Front. Mater. Sci.

2014, Vol. 8

Issue (3) : 264-270 https://doi.org/10.1007/s11706-014-0258-4

RESEARCH ARTICLE

Effect of corrosion on mechanical behaviors of Mg--Zn--Zr alloy in simulated body fluid

Rong SONG¹,De-Bao LIU^1,^*(

),Yi-Chi LIU¹,Wen-Bo ZHENG¹,Yue ZHAO^1,²,Min-Fang CHEN¹

1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
2. School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Northfield Ave, Wollongong, NSW 2522, Australia

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Abstract

The main purpose of this paper is to investigate the effect of corrosion on mechanical behaviors of the Mg--Zn--Zr alloy immersed in simulated body fluid (SBF) with different immersion times. The corrosion behavior of the materials in SBF was determined by immersion tests. The surfaces of the corroded alloys were examined by SEM. The tensile samples of the extruded Mg--2Zn--0.8Zr magnesium alloy were immersed in the SBF for 0, 4, 7, 10, 14, 21 and 28 d. The tensile mechanical behaviors of test samples were performed on an electronic tensile testing machine. SEM was used to observe the fracture morphology. It was found that with extension of the immersion time, the ultimate tensile strength (UTS), yield strength (YS) and elongation (EL) of the Mg–2Zn–0.8Zr samples decreased rapidly at first and then decreased slowly. The main fracture mechanism of the alloy transformed from ductile fracture to cleavage fracture with the increasing immersion times, which can be attributed to stress concentration and embrittlement caused by pit corrosion.

Keywords magnesium alloy simulated body fluid mechanical property fracture mechanism

Corresponding Author(s): De-Bao LIU

Online First Date: 27 August 2014 Issue Date: 12 September 2014

Cite this article:

Rong SONG,De-Bao LIU,Yi-Chi LIU, et al. Effect of corrosion on mechanical behaviors of Mg--Zn--Zr alloy in simulated body fluid[J]. Front. Mater. Sci., 2014, 8(3): 264-270.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-014-0258-4
https://academic.hep.com.cn/foms/EN/Y2014/V8/I3/264

Fig.1 Diagrammatic sketch of the tensile sample.

Fig.2 The solution container for the tensile test sample.

Fig.3 OM microstructures of the Mg–2Zn–0.8Zr alloy experienced an extrusion and aging treatment.

Fig.4 The Nyquist diagram of Mg–2Zn–0.8Zr immersed in SBF for 6 h–7 d.

Fig.5 Surface morphology of Mg–2Zn–0.8Zr alloy after immersion in SBF for (a) 6 h, (b) 24 h, (c) 4 d, (d) 7 d, (e) 14 d and (f) 21 d.

Fig.6 Corrosion morphologies of the magnesium alloys after immersion in SBF for 14 d: (a) cross-section; (b) surface.

Fig.7 Stress–strain curves of Mg–2Zn–0.8Zr alloy tested after immersion of 0, 4, 7, 10, 14, 21 and 28 d in SBF.

Fig.8 The variation in UTS, YS and EL of Mg–2Zn–0.8Zr alloy in different immersion times.

Fig.9 Fractography of the tensile samples after immersion in SBF for (a) 0 d, (b) 4 d, (c) 14 d, and (d) 21 d.

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