Mechanical Properties of Magnesium Alloys Produced by the Heated Mold Continuous Casting Process

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Investigation of the tensile and fatigue properties of cast magnesium alloys, created by the heated mold continuous casting process (HMC), was conducted. The mechanical properties of the Mg-HMC alloys were overall higher than those for the Mg alloys, made by the conventional gravity casting process (GC), and especially excellent mechanical properties were obtained for the Mg97Y2Zn1-HMC alloy. This was because of the fine-grained structure composed of the α-Mg phases with the interdendritic LPSO phase. Such mechanical properties were similar levels to those for conventional cast aluminum alloy (Al84.7Si10.5Cu2.5Fe1.3Zn1 alloys: ADC12), made by the GC process. Moreover, the tensile properties (σUTS and εf) and fatigue properties of the Mg97Y2Zn1-HMC alloy were about 1.5 times higher than that for the commercial Mg90Al9Zn1-GC alloy (AZ91). The high correlation rate between tensile properties and fatigue strength (endurance limit: σl) was obtained. With newly proposed etching technique, the residual stress in the Mg97Y2Zn1 alloy could be revealed, and it appeared that the high internal stress was severely accumulated in and around the long-period stacking-order phases (LPSO). This was made during the solidification process due to the different shrinkage rate between α-Mg and LPSO. In this etching technique, micro-cracks were observed on the sample surface, and amount of micro-cracks (density) could be a parameter to determine the severity of the internal stress, i.e., a large amount to micro-cracks is caused by the high internal stress.

[1] Lapovok, R., Gao, X., Nie, J-F., Estrin, Y. & Mathaudhu, S.N. (2014). Enhancement of properties in cast Mg–Y–Zn rod processed by severe plastic deformation. Mater. Sci. Eng. A 615, 198-207.

[2] Yamasaki, M., Hashimoto, K., Hagihara, K. & Kawamura, Y. (2011). Effect of multimodal microstructure evolution on mechanical properties of Mg–Zn–Y extruded alloy. Acta Mater. 59, 3646-3658.

[3] Matsuda, M., Ando, S. & Nishida, M. (2005). Dislocation structure in rapidly solidified Mg97Zn1Y2 alloy with long period stacking order phase. Mater. Trans. 46, 361-363.

[4] Datta, A., Waghmare, U.V. & Ramamurty, U. (2008). Structure and stacking faults in layered Mg–Zn–Y alloys: a first-principles study. Acta Mater. 56, 2531-2539.

[5] Hagihara, K., Yokotani, N. & Umakoshi, Y. (2010). Plastic deformation behavior of Mg12YZn with 18R long-period stacking ordered structure. Intermetallics. 18, 267-276.

[6] Eddahbi, M., Pérez, P., Monge, M.A., Garcés, G., Pareja, R. & Adeva, P. (2009). Microstructural characterization of an extrude Mg–Ni–Y–Re alloy processed by equal channel angular extrusion. J. Alloys Compd. 473, 79-86.

[7] Xu, C., Zheng, M.Y., Xu, S.W., Wu, K., Wang, E.D., Kamado, S., Wang, G.J. & Lv, X.Y. (2012). Microsstructure and mechanical properties of rolled sheets of Mg–Gd–Y–Zn–Zr alloy: as-cast versus as-homogenized. J. Alloys Compd. 528, 40-44.

[8] Okayasu, M., Ota, K., Takeuchi, S., Ohfuji, H. & Shiraishi, T. (2014). Influence of microstructural characteristics on mechanical properties of ADC12 aluminum alloy. Mater. Sci. Eng. A 592, 189-200.

[9] Ohno, A. (1987). Solidification, 1st ed. Springer. Germany., pp.113-118.

[10] Okayasu, M.& Yoshie, S. (2010). Mechanical properties of Al–Si13–Ni1.4–Mg1.4–Cu1 alloys produced by the Ohno continuous casting process. Mater. Sci. Eng. A 527, 3120-3126.

[11] Okayasu, M. & Takeuchi, S. (2014). Mechanical properties and Failure Characteristics of Mg-9%Al-1%Zn alloys: Tensile Properties. Metall. Mat. Trans. A 45, 5767-5776.

[12] Okayasu, M., Takeuchi, S. & Ohfuji, H. (2014). Mechanical strength and failure characteristics of cast Mg-9 pct Al-1 pct Zn alloys produced by a heated-mold continuous casting process: tensile properties. Metall. Mat. Trans. A 45, 5767-5776.

[13] Okayasu, M., Takeuchi, S., Matsushita, M., Tada, N., Yamasaki, M. & Kawamura, Y. (2016). Mechanical properties and failure characteristics of cast and extruded Mg97Y2Zn1 alloys with LPSO phase. Mater. Sci. Eng. A 652, 14-29.

[14] Okayasu, M. & Takeuchi, S. (2014). Mechanical strength and failure characteristics of cast Mg–9%Al–1%Zn alloys produced by a heated-mold continuous casting process: Fatigue properties. Mater. Sci. Eng. A 600, 211-220.

[15] Puchi-Cabrera, E.S., Staia, M.H., Quinto, D.T., Villalobos-Gutiérres, C.& Ochoa-Pérez, E. (2007). Fatigue properties of a SAE4340 steel coated with TiCN by PAPVD. Int. J. Fatigue. 29, 471-480.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316


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