Effect of Alloyed Mo on Mechanical Properties, Biocorrosion and Cytocompatibility of As-Cast Mg-Zn-Y-Mn Alloys

doi:10.1007/s40195-019-00995-z

摘要/Abstract

Abstract:

The influences of Mo contents on mechanical properties, biocorrosion and cytocompatibility of as-cast Mg-6Zn-8.16Y-2.02Mn-xMo (x = 0.0, 0.1, 0.3, 0.5, 0.7 wt%) alloys were firstly investigated. Appropriate amount of Mo was conducive to grain refinement and the formation of long-period stacking ordered structure with continuous distribution, which was advantageous to mechanical properties and corrosion resistance. Mg-6Zn-8.16Y-2.02Mn-0.3Mo exhibited the ultimate tensile strength of 265.0 MPa, elongation of 13.5% and the lowest weight loss rate in Hank’s solution. Moreover, the cell toxicity cultured in 25% extract was evaluated and the alloy with 0.3 wt% Mo exhibited the best cytocompatibility. Thus, the alloy was expected to become a novel biodegradable implant material.

Key words: Magnesium alloy, Mo, Corrosion, Cytocompatibility, Mechanical properties

. [J]. Acta Metallurgica Sinica (English Letters), 2020, 33(4): 500-513.

Longlong Zhang, Yatong Zhang, Jinshan Zhang, Rui Zhao, Jiaxin Zhang, Chunxiang Xu. Effect of Alloyed Mo on Mechanical Properties, Biocorrosion and Cytocompatibility of As-Cast Mg-Zn-Y-Mn Alloys[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(4): 500-513.

图/表 17

Table 1 Nominal chemical composition of the-cast Mg-Y-Zn-Mn-Mo alloys

Fig. 1 Optical micrographs of as-cast alloys: (a) Alloy A, (b) Alloy B, (c) Alloy C, (d) Alloy D, (e) Alloy E, (f) volume fraction of each phase and average grain size

Fig. 2 XRD patterns of as-cast Mg-6Zn-8.16Y-2.02Mn alloys with different Mo additions

Fig. 3 SEM images of as-cast alloys: (a) Alloy A, (b) Alloy B, (c) Alloy C, (d) Alloy D, (e) Alloy E, and EDS analysis results of (f) point A, (g) point B

Fig. 4 SEM micrograph of the Mg-6Zn-8.16Y-2.02Mn-0.3Mo alloy, (b-f) EDS maps

Fig. 5 Comparison of the UTS and elongation of as-cast Mg-6Zn-8.16Y-2.02Mn-xMo alloys

Fig. 6 Immersion tests of Mg-6Zn-8.16Y-2.02Mn-xMo alloys in Hank’s solution (a) hydrogen evolution, (b) the average corrosion rate

Fig. 7 Morphologies of corrosion product formed on the surface of (a) Alloy A, (b) Alloy B, (c) Alloy C, (d) Alloy D, (e) Alloy E immersed in Hank’s solution for 3 h

Fig. 8 SEM micrographs of alloys immersed in Hank’s solution after removing corrosion products (a, b) Alloy A, (c, d) Alloy B, (e, f) Alloy C, (g, h) Alloy D, (i, j) Alloy E

Table 2 EDS analysis result of Alloy C from Fig. 8e (at.%)

Fig. 9 Potentiodynamic polarization curves of Mg-6Zn-8.16Y-2.02Mn-xMo alloys

Table 3 Typical parameter values from the polarization curves of Mg-Zn-Y-Mn-Mo alloys

Fig. 10 Electrochemical impedance spectra of Mg-6Zn-8.16Y-2.02Mn-xMo alloys in Hank’s solution a Nyquist diagram, compatible Equivalent circuit and b Bode spectra

Table 4 Parameters of the alloys obtained from electrochemical impedance spectra

Fig. 11 Optical images of L929 cells that cultured in Mg-6Zn-8.16Y-2.02Mn-xMo extraction mediums for 1 day, 2 days and 3 days

Fig. 12 Relative growth rate of cells for Mg-6Zn-8.16Y-2.02Mn-xMo alloys cultured in 25% extract solution for 1 day, 2 days and 3 days

Fig. 13 Schematic diagrams of corrosion mechanisms of as-cast Mg-6Zn-8.16Y-2.02Mn-xMo alloys

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