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

• Autorzy: Okayasu M. , Wu S. , Tanimoto T. , Takeuchi S.
• Języki publikacji: EN

Abstrakty

EN

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 (Al_84.7Si_10.5Cu_2.5Fe_1.3Zn₁ alloys: ADC12), made by the GC process. Moreover, the tensile properties (σ<sub<UTS</sub> and ε_f) 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: σ_l) 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.

Słowa kluczowe

EN

magnesium alloy; unidirectional solidification; continuous casting; mechanical properties; microstructural characteristic

PL

stop magnezu; krystalizacja kierunkowa; odlewanie ciągłe; właściwości mechaniczne; charakterystyka mikrostrukturalna

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 4
• Strony: 208--216
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr.

Twórcy

autor

Okayasu M.

• Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan

autor

Wu S.

• Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan

autor

Tanimoto T.

• Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan

autor

Takeuchi S.

• Graduate School of Science and Technology, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan

Bibliografia

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• [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.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.