The Effect of Additions of Zn and Zr on the Microstructure and Texture of Cast and Wrought Mg Alloys with Different Content of Ca

Abstract:

The microstructure of magnesium alloys containing 1% and 2.5% Mg, as well as the addition of 6% Zn and 0.6% Zr was examined in as-cast and as-extruded condition. After the casting process, the presence of Mg₂Ca and Ca₂Mg₆Zn₃ phases was determined by means of the scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The microstructure of MgCa0.8Zn6.1Zr0.6 and MgCa2.8Zn6.1Zr0.6 alloys after the extrusion process revealed an impact of Zr addition on grain refinement. The electron backscatter diffraction (EBSD) analysis showed that, among all the tested alloys, the smallest grain size was found in the MgCa2.8Zn6.1Zr0.6 alloy and the mean grain diameter amounted to about 4 mm. The analysis of texture has indicated that the lattice planes most often parallel to the cross-sections of the examined magnesium rods are the crystal lattice planes (1 0-1 0).

• Periodical: Solid State Phenomena (Volume 231)
• Pages: 73-79
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.231.73
• Online since: June 2015
• Authors: Sonia Boczkal*, Marzena Lech-Grega, Janusz Żelechowski
• Keywords: EBSD Maps, MgCa Alloys, Phase Analysis, Zn Addition, Zr Addition

References

[1] J.F. Nie, B.C. Muddle, Precipitation hardening of Mg-Ca(Zn) alloys, Scripta Mater. 37 (1997) 1475-1478.

DOI: 10.1016/s1359-6462(97)00294-7

[2] N.T. Kirkland, M.P. Staiger, D. Nisbet, Ch.H.J. Davies, N. Birbilis, Performance-driven design of biocompatibile Mg alloys, JOM, June (2011) 28-32.

DOI: 10.1007/s11837-011-0089-z

[3] Y. Li, P.D. Hodgson, C. Wen, The effects of calcium and yttrium additions on the micromicrostructure, mechanical properties and biocompatibility of biodegradable magnesium alloys, J. Mater. Sci. 46 (2011) 365-370.

DOI: 10.1007/s10853-010-4843-3

[4] T. Bhattacharjee, C.L. Mendis, T.T. Sasaki, T. Ohkubo, K. Hono, Effect of Zr addition on the precipitation in Mg–Zn-based alloy, Scripta Mater. 67 (2012) 967-972.

DOI: 10.1016/j.scriptamat.2012.08.031

[5] M. Salahshoor, Y. Guo, Biodegradable orthopedic magnesium-calcium (MgCa) alloys, processing, and corrosion performance, Materials 5 (2012) 135-155.

DOI: 10.3390/ma5010135

[6] A. Shibayama, Y. Terada, Y. Murata, M. Morinaga, Creep behavior of hypoeutectic Mg-Ca binary alloy, Mater. Trans. 51 (2010) 2284-2288.

DOI: 10.2320/matertrans.m2010201

[7] Y. Wan, G. Xiong , H. Luo, F. He, Y. Huang, X. Zhou, Preparation and characterization of a new biomedical magnesium–calcium alloy, Mater. Design 29 (2008) 2034-(2038).

DOI: 10.1016/j.matdes.2008.04.017

[8] Z. Li, X. Gu, S. Lou, Y. Zheng, The development of binary Mg-Ca alloys for use as biodegradable materials within bone, Biomaterials 29 (2008) 1329-1344.

DOI: 10.1016/j.biomaterials.2007.12.021

[9] K. Oh-ishi, R. Watanabe, C.L. Mendis, K. Honoa, Age-hardening response of Mg-0. 3 at. %Ca alloys with different Zn content, Mater. Sci. Eng. A 526 (2009) 177-181.

DOI: 10.1016/j.msea.2009.07.027

[10] X. Gao, J.F. Nie, Characterization of strengthening precipitate phases in a Mg–Zn alloy, Scripta Mater. 57 (2007) 655-661.

DOI: 10.1016/j.scriptamat.2007.01.006

[11] K. Kubok, L. Lityńska-Dobrzyńska, J. Wojewoda-Budka, A. Góral, A. Dębski, Investigation of Microstructures in As-Cast Alloys from the Mg-Zn-Ca System, Arch. Metall. Mater. 58 (2013) 329-333.

DOI: 10.2478/v10172-012-0193-2