Microstructure, mechanical, and corrosion properties of extruded low-alloyed Mg-xZn-0.2Ca alloys

Abstract

The microstructure, mechanical, and corrosion properties of extruded low-alloyed Mg-xZn-0.2Ca (x = 0,1.0,2.0, 3.0) alloys were investigated in this study. Findings from scanning electron microscope, X-ray diffraction and transmission electron microscopy results indicate that the amount of ternary Ca₂Mg₆Zn₃ phase, as the only secondary phase in 1.0Zn, 2.0Zn, and 3.0Zn alloys, gradually increases with the addition of Zn, while the Mg₂Ca phase was observed in the Mg-0.2Ca alloy only. Zn has a strong effect on the orientation and intensity of textures, which also influence mechanical behaviors, as revealed by electron back-scatter diffraction. Among all the alloys, the Mg-2.0Zn-0.2Ca alloy obtains the maximum tensile strength (278 MPa) and yield strength (230 MPa). Moreover, Zn addition has an evident influence on the corrosion properties of Mg-xZn-0.2Ca alloy, and Mg-l.0Zn-0.2Ca alloy exhibits the minimum corrosion rate. This paper provides a novel low-alloyed magnesium alloy as a potential biodegradable material.

Keywords

magnesium alloy / Mg-Zn-Ca alloy / extrusion / microstructure / mechanical properties / corrosion properties / textures

References

[1] Baksheesh-Rad HR, Hamzah E, Fereidouni-Lotfabadi A, Daroonparvar M, Yajid MAM, Mezbahul-Islam M, Kasiri-Asgarani M, Medraj M. Mcrostructure and bio-corrosion behavior of Mg-Zn and Mg-Zn-Ca alloys for biomedical applications. tMater. Corros., 2014, 65, 1178.

[2] Brar HS, Ball IP, Berglund IS, Allen IB, Manuel MV. A study of a biodegradable Mg-3Sc-3Y alloy and the effect of self-passivation on the in vitro degradation. tActa Biomater., 2013, 9, 5331.

[3] Tong LB, Zheng MY, Cheng LR, Kamado S, Zhang HI. Effect of extruded ratio on micro structure, texture and mechanical properties of indirectly extruded Mg-Zn-Ca alloy. tMater. Sci. Eng. A, 2013, 569, 48.

[4] Du YZ, Zheng MY, Xu C, Qiao XG, Wu K, Liu XD, Wang GJ, Lv XY. Micro structures and mechanical properties of as-cast and as-extruded Mg-4.50Zn-1.13Ca (wt%) alloys. Mater. Sci. Eng. A, 2013, 576, 6.

[5] Hradilová M, Vojtěch D, Kubásek J, Čapek I, Vlach M. Structural and mechanical characteristics of Mg-4Zn and Mg-4Zn-0.4Ca alloys after different thermal and mechanical processing routes. tMater. Sci. Eng. A, 2013, 586, 284.

[6] Bakhsheshi-Rad HR, Idris MH, Abdul-Kadir MR, Ourdjini A, Medraj M, Daroonparvar M, Hamzah E. Mechanical and bio-corrosion properties of quaternary Mg-Ca-Mn-Zn alloys compared with binary Mg-Ca alloys. tMater. Des., 2014, 53, 283

[7] Yang I, Peng I, Li M, Nyberg EA, Pan FS. Effects of Ca addition on the mechanical properties and corrosion behavior of ZM21 wrought alloys. tActa Metall. Sin. (Engl. Lett.), 2017, 30, 53.

[8] Yin P, Li NF, Lei T, Liu L, Ouyang C. Effects of Ca on microstructure, mechanical and corrosion properties and biocompatibility of Mg-Zn-Ca alloys. J. Mater. Sci. -Mater. Med., 2013, 24, 1365.

[9] Zhang BP, Geng L, Huang LI, Zhang XX, Dong CC. Enhanced mechanical properties in fine-grained Mg-l.0Zn-0.5Ca alloys prepared by extruded atdifferent temperatures. Scr.Mater., 2010, 63, 1024.

[10] Hofstetter I, Rüedi S, Baumgartner I, Kilian H, Mingler B, Povoden-Karadeniz E, Pogatscher S, Uggowitzer PI, Löffler IF. Processing and microstructure-property relations of high-strength low-alloy (HSLA) Mg-Zn-Ca alloys. tActa Mater, 2015, 98, 423.

[11] Tong LB, Zheng MY, Hu XS, Wu K, Xu SW, Kamado S, Kojima Y. Influence of ECAP routes on micro-structure and mechanical properties of Mg-Zn-Ca alloy. tMater. Sci. Eng. A, 2010, 527, 4250.

[12] Kokubo T, Takadama H. How useful is SBF in predicting in vivo bone bioactivity, Biomaterials, 2006, 27, 2907

[13] Zander D, Zumdick NA. Influence of Ca and Zn on the microstructure and corrosion of biodegradable Mg-Ca-Zn alloys. tCorros. Sci., 2015, 93, 222.

[14] Zhang E, Yang L. Microstructure, mechanical properties and bio-corrosion properties of Mg-Zn-Mn-Ca alloy for biomedical application. tMater. Sci. Eng. A, 2008, 497, 111.

[15] Takeuchi A, Inoue A. Classification of bulk metallic glasses by atomic size difference, heat of mixing and period of constituent elements and its application to characterization of the main alloying element. tMater. Trans., 2005, 46, 2817.

[16] Kubok K, Litynska-Dobrzynska L, Wojewoda-Budka I, Goral A, Debski A. Investigation of structures in as-cast alloys from the Mg-Zn-Ca system. tArch. Metall. Mater, 2013, 58, 399.

[17] Levi G, Avraham S, Ziberov A, Bamberger M. Solidification, solution treatment and age hardening of a Mg-1.6wt% Ca-3.2wt% Zn alloy. Acta Mater., 2006, 54, 523.

[18] Lu Y, Bradshaw AR, Chiu YL, lones LP. Effects of secondary phase and grain size on the corrosion of biodegradable Mg-Zn-Ca alloys. tMater. Sci. Eng. C, 2015, 48, 480.

[19] Geng L, Zhang BP, Li AB, Dong CC. Microstructure and mechanical properties of Mg^l.0Zn-0.5Ca alloy. Mater. Lett, 2009, 63, 557.