THE INFLUENCE OF EQUAL CHANNEL ANGULAR PRESSING ON THE STRUCTURE AND MECHANICAL PROPERTIES OF MAGNESIUM Mg-Zn-Ca ALLOYS


Cite item

Full Text

Abstract

Due to its close to the ideal straight-to-density ratio and good biocompatibility, the Mg-Zn-Ca system is the advanced alloy among the magnesium alloys, which are considered for the potential use as the medical implants. However, despite the significant progress in the development of biocompatible magnesium alloys, their technological plasticity is still insufficient and many of their properties are still uninvestigated. In order to increase the plasticity, various methods of structure management by means of grain refining and creation of special proeutectoid constituent distribution are being actively developed lately, which are based on the application of thermomechanical processing including the severe plastic deformation. In this paper, the authors studied the influence of severe plastic deformation using the method of equal channel angular pressing on the structure and properties of Mg-4Zn-0,16Ca and Mg-4Zn-0,56Ca magnesium alloys.

It was found that the increase of calcium content in the initial state leads to the increase of second phases volume fraction. At the same time, the proeutectoid constituent precipitate contains the elevated concentration of the major alloying elements – zinc and calcium.

After the equal channel angular pressing, even at a relatively high homologous deformation temperature, it is impossible to obtain a uniform recrystallized microstructure. The obtained microstructure is bimodal; it consists of relatively fine grains and large non-recrystallized grains. The authors notice that the Mg-4Zn-0,56Ca alloy exhibits the significant increase in tensile mechanical properties to the level of the top-ranking high-strength alloys of this class. It can be explained by the peculiarities of the bimodal grain structure and, probably, by the peculiarities of the crystallographic texture.

About the authors

Aleksey Yurievich Vinogradov

Togliatti State University, Togliatti

Author for correspondence.
Email: alexei.vino@gmail.com

Doctor of Sciences (Engineering), PhD (Physics and Mathematics), Deputy Director of the Research Institute of Progressive Technologies

Россия

Evgeniy Viktorovich Vasiliev

Togliatti State University, Togliatti

Email: avellko@yandex.ru

junior researcher of the Research Institute of Progressive Technologies

Россия

Mikhail Leonidovich Linderov

Togliatti State University, Togliatti

Email: dartvi@gmail.com

junior researcher of the Research Institute of Progressive Technologies

Россия

Dmitriy Lvovich Merson

Togliatti State University, Togliatti

Email: D.Merson@tltsu.ru

Doctor of Sciences (Physics and Mathematics), Professor, Director of the Research Institute of Progressive Technologies

Россия

Elena Olegovna Rzhevskaya

Togliatti State University, Togliatti

Email: u.e.o@mail.ru

junior researcher of the Research Institute of Progressive Technologies

Россия

References

  1. Staiger M.P., Pietak A.M., Huadmai J., Dias G.J. Magnesium and its alloys as orthopedic biomaterials. Biomaterials, 2006, vol. 27, no. 9, pp. 1728–1734.
  2. Mathieu S., Rapin C., Steinmetz J., Steinmetz P.A. A corrosion study of the main constituent phases of AZ91 magnesium alloys. Corrosion Science, 2003, vol. 45, no. 12, pp. 2741–2755.
  3. Li L., Gao J., Wang Y. Evaluation of cyto-toxicity and corrosion behavior of alkali-heat-treated magnesium in simulated body fluid. Surface and Coatings Technology, 2004, vol. 185, no. 1, pp. 92–98.
  4. Chen J., Wang J., Han E., Dong J., Ke W. Corrosion behavior of AZ91D magnesium alloy in sodium sulfate solution. Materials and Corrosion, 2006, vol. 57, no. 10, pp. 789–793.
  5. Witte F. The history of biodegradable magnesium implants. Acta biomaterialia, 2010, vol. 6, no. 5, pp. 1680–1692.
  6. Zheng Y. Magnesium Alloys as Degradable Biomaterials. CRC Press, 2015. 578 p.
  7. Mani G., Feldman M.D., Patel D., Aqrawal C.M. Coronary stents: a materials perspective. Biomaterials, 2007, vol. 28, no. 9, pp. 1689–1710.
  8. Chino Y., Kobata M., Iwasaki H., Mabuchi M. Tensile Properties from Room Temperature to 673 K of Mg-0.9 mass% Ca Alloy Containing Lamella Mg2Ca. Materials Transactions, 2002, vol. 43, no. 10, pp. 2643–2646.
  9. Song G. Control of biodegradation of biocompatable magnesium alloys. Corrosion Science, 2007, vol. 49, no. 4, pp. 1696–1701.
  10. Tapiero H., Tew K. D. Trace elements in human physiology and pathology: zinc and metallothioneins. Biomedicine & Pharmacotherapy, 2003, vol. 57, no. 9, pp. 399–411.
  11. Zhang S., Zhang X., Zhao C., Li J., Song Y., Xie C., Tao H., Zhang Y., He Y., Jiang Y., Bian Y. Research on an Mg–Zn alloy as a degradable biomaterial. Acta Biomaterialia, 2010, vol. 6, no. 2, pp. 626–640.
  12. Luo A., Pekguleryuz M.O. Cast magnesium alloys for elevated temperature applications. Journal of Materials Science, 1994, vol. 29, no. 20, pp. 5259–5271.
  13. Kocks U.F.D., Westlake G. The importance of twinning for the ductility of CPH polycrystals. Trans. Metall. Soc. AIME, 1967, vol. 239, pp. 1107–1109.
  14. Dobatkin S.V., Estrin Y., Rokhlin L.L., Popov M.V., Lavopok R., Dobatkina T.V, Timofeev V.N., Nikitina N.I. Structure and properties of Mg-Al-Ca alloy after severe plastic deformation. Materials Science Forum, 2008, vol. 584, pp. 559–564.
  15. Dobatkin S. V., Rokhlin L.L., Salishchev G.A., Kopylov V.I., Serebryany V.N., Stepanov N.D., Tarytina I.E., Kuroshev I.S., Martynenko N.S. Structure and properties of an Mg-0.3% ca magnesium alloy after multiaxial deformation and equal-channel angular pressing. Russian Metallurgy (Metally), 2014, vol. 2014, no. 11, pp. 911–919.
  16. Serebryany V.N. Texture, Microstructure, and Ductility of Mg-Al-Zn Alloy after Equal Channel Angular Pressing. Materials Science Forum, 2010, vol. 633, pp. 365–372.
  17. Nugmanov D.R., Sitdikov O.S., Markushev M.V. Texture and anisotropy of yield strength in multistep isothermally forged Mg-5.8 Zn-0.65 Zr alloy. IOP Conference Series: Materials Science and Engineering, 2015, vol. 82, no. 1, pp. 012099.
  18. Nugmanov D.R., Sitdikov O.S., Markushev M.V. About fine-grain structure forming in bulk magnesium alloy MA14 under multidirectional isothermal forging. Bas. Problelm in Materials Science, 2012, no. 9, p. 230.
  19. Nugmanov D.R., Sitdikov O.S., Markushev M.V. Structure of magnesium alloy MA14 after multistep isothermal forging and subsequent isothermal rolling. The Physics of Metals and Metallography, 2015, vol. 116, no. 10, pp. 993–1001.
  20. Lu Y. Microstructure and degradation behaviour of Mg-Zn (-Ca) alloys. Birmingham, University of Birmingham, 2014. 215 p.
  21. Bakhsheshi‐Rad H.R., Hamzah E., Lotfabadi A.F., Daroonparvar V., Yajid M.A.M., Islam M.M. Microstructure and bio‐corrosion behavior of Mg–Zn and Mg–Zn–Ca alloys for biomedical applications. Materials and Corrosion, 2014, vol. 65, no. 12, pp. 1178–1187.
  22. Ma E. Eight routes to improve the tensile ductility of bulk nanostructured metals and alloys. JOM, 2006, vol. 58, no. 4, pp. 49–53.
  23. Zhang B., Hou Y., Wang X., Wang Y., Geng L. Mechanical properties, degradation performance and cytotoxicity of Mg–Zn–Ca biomedical alloys with different compositions. Materials Science and Engineering: C, 2011, vol. 31, no. 8, pp. 1667–1673.
  24. Hofstetter J., Becker M., Martinelli E., Weinberg A.M., Mingler B., Kilian H., Pogatscher S., Uggowitzer P.J., Löffler J.F. High-strength low-alloy (HSLA) Mg–Zn–Ca alloys with excellent biodegradation performance. JOM, 2014, vol. 66, no. 4, pp. 566–572.

Supplementary files

Supplementary Files
Action
1. JATS XML
Download

Copyright (c)



This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies