Microstructure and Properties of Experimental Mg-9Al-5RE-1Zn-Mn Magnesium Alloy
DOI:
https://doi.org/10.24425/afe.2023.148960Abstract
In this paper, an experimental Mg-Al-RE-type magnesium alloy, named AEZ951, is presented. The chemical composition of the investigated alloy was ca. 9 wt% Al, 5 wt% RE (rare earth elements), 0.7 wt% Zn and 3 wt% Mn. The experimental material was gravity cast into a cold steel mould. Microstructure analyses were carried out by light microscopy, along with X-ray phase analysis and scanning electron microscopy with an energy-dispersive X-ray spectrometer (SEM + EDX). Detailed investigations disclosed the presence of and Al10RE2Mn7 intermetallic compounds in the alloy microstructure. The(Mg) solid solution and Al11RE3, primary dendrites of an eutectic was also presented. The hardness, impact strength, tensile strength as well as the+volume fraction of the Al11RE3 phase and yield strength of the alloy were examined in tests at room temperature. The examined experimental Mg-Al-RE-type magnesium alloy exhibited higher mechanical properties than the commercial AZ91 alloy (cast in the same conditions).References
[1] Lee, S.G., Patel, G.R., Gokhale, A.M., Sareeranganathan, A. & Horstemeyer, M.F. (2006). Quantitative fractographic analysis of variability in the tensile ductility of high-pressure die-cast AE44 Mg-alloy. Materials Science Engineering A. 427(1-2), 255-262. DOI:10.1016/j.msea.2006.04.108.
[2] Braszczyńska-Malik, K. & Malik, M.A. (2020). Impact strength of AE-type alloys high pressure die castings. Archives of Foundry Engineering. 20(3), 5-8. DOI:10.24425/afe.2020.133321.
[3] Yang, Q., Guan, K., Li, B., Lv S., Meng F., Sun W., Zhang Y., Liu, X. & Meng, J. (2017). Microstructural characterizations on Mn-containing intermetallic phases in a high-pressure die-casting Mg–4Al–4RE–0.3Mn alloy. Materials Characterization. 132, 381-387. https://doi.org/10.1016/j.matchar.2017.08.032.
[4] Yang, Q., Lv, SH., Meng, FZ., Guan, K., Li, B.-S., Zhang, X-H., Zhang, J.-Q., Liu X.-J. & Meng. J. (2019). Detailed structures and formation mechanisms of well-known Al10RE2Mn7 phase in die-cast Mg–4Al–4RE–0.3Mn Alloy. Acta Metallurgica Sinica (English Letters). 32, 178-186. https://doi.org/10.1007/s40195-018-0819-0.
[5] Braszczyńska-Malik, K.N. & Grzybowska, A. (2016). Influence of phase composition on microstructure and properties of Mg-5Al-0.4Mn-xRE (x = 0,3 and 5 wt.%) alloys. Materials Characterization. 115, 14-22. https://doi.org/10.1016/j.matchar.2016.03.014
[6] Zhou, W., Li, Z., Li, D., Qin, M. & Zeng, X. (2022). Solidification microstructure evolution in LA42 Mg alloy under various cooling rates. Journal of Materials Science. 57, 11411-11429. https://doi.org/10.1007/s10853-022-07330-5.
[7] Cai, H., Wang, Z., Liu, L., Li, Y., Xing, F. & Guo F. (2022). Formation sequence of compounds in AZ91-0.9Ce alloy and its role in fracture process. Advanced Engineering Materials. 24(7), 2101411. https://doi.org/10.1002/adem.202101411.
[8] Braszczyńska-Malik, K.N. (2014). Some mechanical properties of experimental Mg-Al-Mn-RE alloy. Archives of Foundry Engineering. 14(1), 13-16. DOI:10.2478/afe-2014- 0003.
[9] Yang, Q., Guan, K., Li, B., Lv, S., Meng, F., Sun, W., Zhang, Y., Liu, X. & Meng, J. (2017). Microstructural characterizations on Mn-containing intermetallic phases in a high-pressure die-casting Mg–4Al–4RE–0.3Mn alloy. Materials Characterization. 132, 381-387. https://doi.org/10.1016/j.matchar.2017.08.032.
[10] Zhou, W., Li, Z., Li, D., Qin, M. & Zeng X. (2022). Solidification microstructure evolution in LA42 Mg alloy under various cooling rates. Journal of Materials Science. 57, 11411-11429. https://doi.org/10.1007/s10853-022-07330-5.
[11] Braszczyńska, K.N. (2003). Contribution of SiC particles to the formation of the structure of Mg-3 wt.% RE cast composites. Zeitschrift für Metallkunde. 94, 144-148. https://doi.org/10.3139/ijmr-2003-0028.
[12] Li, L., Li, D., Zeng, X., Luo, A.A., Hu, B., Sachdev, A. K., Gu, L. & Ding, W. (2020). Microstructural evolution of MgAl-RE alloy reinforced with alumina fibers. Journal of Magnesium Alloys. 8(3), 565-577. https://doi.org/10.1016/j.jma.2019.07.012.
[13] Braszczyńska-Malik, K. & Przełożyńska, E. (2017). The influence of Ti particles on microstructure and mechanical properties of Mg-5Al-5RE matrix alloy composite. Journal of Alloys and Compounds. 728, 600-606. https://doi.org/10.1016/j.jallcom.2017.08.177.
[14] Tang, B., Li, J., Wang, Y., Luo, H., Ye, J., Chen, X., Chen, X., Zheng, K. & Pan, F. (2022). Mechanical properties and microstructural characteristics of Ti/WE43 composites. Vacuum. 206, 111534. https://doi.org/10.1016/ j.vacuum.2022.111534.
[15] Powder Diffraction File, PDF-4+, International Centre for Diffraction Data (ICDD), Pennsylvania, USA, 2014.
