PSI - Issue 23

Jan Pinc et al. / Procedia Structural Integrity 23 (2019) 21–26 Jan Pinc et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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3. Conclusion

The influence of the cooling rate on microstructure and hardness of the as-cast alloy ZnMg0.8Ca0.2 was successfully observed. Zinc dendrites, Mg 2 Zn 11 , MgZn 2 and CaZn 13 phases were found in the structure. Based on the microstructures of the prepared materials, the relation between the cooling rate and the dendrite arm spacing was found. The relation also affects the macro-hardness of the materials. Influence of the thermal treatment process on the structure and macro-hardness was observed as well. The obtained data is in good agreement with micro-hardness measurements of the particular phases. Acknowlegements The authors would like to thank the Czech Science Foundation (project no. 18-06110S) and to the Operational Programme Research, Development and Education financed by European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. SOLID21 - CZ.02.1.01/0.0/0.0/16_019/0000760) for supporting this research. Dambatta, M. S., Izman, S., Kurniawan, D. and Hermawan, H. 2017. Processing of Zn-3Mg alloy by equal channel angular pressing for biodegradable metal implants. Journal of King Saud University - Science 29, 455-461. Finkel, A., Shepeleva, L., Bamberger, M. and Rabkin, E. 2006. The effect of exposure to elevated temperatures on the microstructure and hardness of Mg-Ca-Zn alloy. Zeitschrift Fur Metallkunde 97, 64-71. Kubasek, J., Pospisilova, I., Vojtech, D., Jablonska, E. and Ruml, T. 2014. Structural, mechanical and cytotoxicity characterization of as-cast biodegradable Zn-xMg (x=0.8-8.3 %) alloys. Materiali in Tehnologije 48, 623-629. Li, H., Zheng, Y. and Qin, L. 2014. Progress of biodegradable metals. Progress in Natural Science: Materials International 24, 414-422. Liu, X., Sun, J., Qiu, K., Yang, Y., Pu, Z., Li, L. and Zheng, Y. 2016. Effects of alloying elements (Ca and Sr) on microstructure, mechanical property and in vitro corrosion behavior of biodegradable Zn – 1.5Mg alloy. Journal of Alloys and Compounds 664, 444-452. Plum, L. M., Rink, L. and Haase, H. 2010. The Essential Toxin: Impact of Zinc on Human Health. International Journal of Environmental Research and Public Health 7, 1342-1365. Vojtěch, D., Kubásek, J., Šerák, J. and Novák, P. 2011. Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation. Acta Biomaterialia 7, 3515-3522. Zheng, Y. F., Gu, X. N. and Witte, F. 2014. Biodegradable metals. Materials Science and Engineering: R: Reports 77, 1-34. References