Casting of High Aluminum Content AM Series Magnesium Alloys by Using a Horizontal Twin Roll Caster

Abstract:

In this paper, twin roll casting of magnesium alloys with high aluminum content such as, Mg-11 mass%Al-0.2 mass%Mn, Mg-12 mass%Al-0.2 mass%Mn, Mg-13 mass%Al-0.2 mass% have been performed for the purpose of use as an original material for hot forging. Also the mechanical properties of the cast materials were examined. A 10 miri-meters thick strip was cast by the use of a horizontal twin roll caster. The microscopic observation was conducted to investigate into the precipitation of the metal compounds such as Mg₁₇Al₁₂, and the Vickers hardness of the cast strips test were performed. From the result of the roll casting experiments, a 10 mm thick strip was continuously cast at a roll speed of 3.1 m/min. The average grain size of the casting strips was about 46 micron meters. When the aluminum content was 13%, the hardness of the twin roll cast (TRC) strips became 1.7 times higher than that of extruded AZ 31. Also, a uniaxial compression test at elevated temperature was conducted to obtain a true strain-true stress curve for examining possibility of direct hot forging (DHF) of TRC magnesium alloys with high aluminum content.

• Periodical: Key Engineering Materials (Volume 841)
• Pages: 340-345
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.841.340
• Online since: May 2020
• Authors: Hotaka Tozuka, Kanae Seki, Hisaki Watari*, Toshio Haga
• Keywords: Hot Forging, Magnesium Alloy, Rapid Solidification, Twin Roll Casting

References

[1] O. Lunder; K. Nisancioglu, R. Hansen, Corrosion of Die Cast Magnesium-Aluminum Alloys, SAE Technical Paper, 930755 (1993).

DOI: 10.4271/930755

[2] H. Komai, H. Ohara, K. Katoh. M. Nomoto, Development of JIS standard for flammability test methods for magnesium alloys, J. Japan Institute Light Metals, 68(7) (2018) 347-353.

DOI: 10.2464/jilm.68.347

[3] H. Watari, T. Haga, K. Davey, N. Koga, T. Yamazaki, Continuous Strip Casting of Magnesium Alloy by a Horizontal Twin Roll Caster, J. Achievements Mech. Mater. Eng. 16(1-2) (2006) 171-176.

DOI: 10.1002/9783527607969.ch7

[4] S. Hirawatari, H. Watari, S. Nishida, Y. Sato, M. Suzuki, Evaluation of Friction Properties of Magnesium Alloy during Hot Forging by Ring Compression Test, Mater. Sci. Forum. 889 (2017) 119-126.

DOI: 10.4028/www.scientific.net/msf.889.119

[5] S. Hirawatari, H. Watari, S. Nishida, M. Suzuki, T. Haga, Hot Forging of Roll-Cast Magnesium Alloys with High Aluminum Content, Key Eng. Mater. 789 (2018) 187-194.

DOI: 10.4028/www.scientific.net/kem.789.187

[6] S. Masanori, M. Kenichiro, K. Osakada, Finite element and physical simulations of non-steady state metal flow and temperature distribution in twin roll strip casting, Transactions of the JSME. 62(601) (1996) 308-312.

[7] S. Nishida, M. Motomura, Strip casting of pure magnesium and an AZ31 magnesium alloy by the melt drag process, J. Japan Institute Light Metals, 55(7) (2005) 315-320.

DOI: 10.2464/jilm.55.315

[8] S. Saikawa, K. Minami, K. Terayama, S. Ikeno, Aging Behavior of AM System Alloys Containing a High Concentration of Al, J. Smart Process. 4(1) (2015) 55-62.

DOI: 10.7791/jspmee.4.55