Fabrication of High Aluminum Content Mg alloys using a Horizontal Twin Roll Caster

This study was aimed for investigating of manufacturing high aluminum content Mg alloys using a horizontal twin roll caster. Recently, weight saving has been key issues for lighter transport equipments as well as electronic component parts. As alternative materials to aluminum alloys, developing magnesium alloy with higher strength has been expected. Normally high Aluminum content Mg alloy has poor ductility and is difficult to be rolled because of its high strength. However, twin roll casting process is suitable for manufacturing wrought Mg alloys because materials can be cast directly from molten metal. In this study, manufacturing of high aluminum content magnesium alloy sheet using the roll casting process has been carried out. Effects of manufacturing parameter, such as roll velocity, pouring temperature and roll gap, on casting was investigated. A microscopic observation of the crystals of cross section of as cast strip as well as rolled strip was conducted.

Authors:

• H. Harada
• S. Nishida
• T. Nagumo
• M. Endo
• H. Watari

Keywords:

• AZ91
• AZ111
• AZ121
• Magnesium alloys
• Twin roll casting

References:

[1] T. Ozaki, S. Kamado, Y. Kuroki, T. Tanaka, M. Imuta, "Development of
a New High-Strength Magnesium Alloy" IHI technical review, Vol.51
No.1 ,2011,
[2] H.Watari, T. Haga, Y. Shibue, K. Davay, N. Koga, "Twin roll casting of
magnesium alloys with high aluminum contents" Journal of
Achievements in Materials and Manufacturing Engineering, Vol.18,
2006, pp. 429-422.
[3] T. Haga, "Twin roll casters for aluminum alloys" Journal of Japan
Institute of Light Metals, Vol. 59, No. 9, 2009, pp. 509-520
[4] H. Watari, R. Paisarn, T. Haga, K. Noda, K. Davey, N. Koga,
"Development of manufacturing process of wrought magnesium alloy
sheets by twin roll casting" Journal of Achievements in Materials and
Manufacturing Engineering, Vol.20, 2007, pp. 515-518
[5] T. Haga, H. Watari, S. Kumai, "High speed roll casting of Mg alloy strip
by a vertical type twin roll caster" Journal of Achievements in Materials
and Manufacturing Engineering, Vol.15, 2006, pp. 186-192.