Precipitation Behaviour of Zirconium Compounds in Zr-Bearing Al-Mg-Si Alloy

Abstract:

Article Preview

In commercial aluminum alloys, Zr is recognized as an important additional element improving their properties such as strength, corrosion resistivily, and so on. It forms very fine particles of the metastable Al3Zr phase with L12 ordered configuration, in the case of alloys without Si. On the other hand, the DO22-type (Al, Si)3Zr phase besides the L12-type Al3Zr phase is precipitated in alloys including large amounts of Si, such as 6000 series. In this study the main stress falls on precipitation behavior of these Zr compounds in a Zr bearing Al-Mg-Si alloy. The Al-0.67Mg-0.97Si-0.37Zr alloy was cast into a metal mold and hot-rolled to a 5 mm thick plate. A lot of fine L12-type Al3Zr particles were coherently precipitated in the matrix by aging the plate at 673K. The aged plate was cold-rolled to a 1 mm thick sheet and annealed at 553-813K, and then microstructure was investigated by using a transmission electron microscope. It was realized that fine coherent L12-type Al3Zr particles are transformed to incoherent and coarse DO22-type (Al, Si)3Zr particles through recrystallization. The DO22-type (Al, Si)3Zr particles reduced recrystallized grain size owing to their pinning effect.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

501-506

DOI:

10.4028/www.scientific.net/MSF.519-521.501

Citation:

Y. Himuro et al., "Precipitation Behaviour of Zirconium Compounds in Zr-Bearing Al-Mg-Si Alloy", Materials Science Forum, Vols. 519-521, pp. 501-506, 2006

Online since:

July 2006

Export:

Price:

$35.00

[1] H. Westengen, L. Auran and O. Reiso: Aluminium, 57(1981), 797.

[2] K. Ohori, Y. Takeuchi and H. Matsuyama: Proc. 3rd Int. Aluminum Extrusion Tech. Semi., vol. 1, (1981), 63.

[3] O. Reiso, H. Westengen and L. Auran: Proc. 7th Int. Confer. Light Metals, (1981), 186.

[4] T. Sato and Kamino: Proc. Int. Conf. of Science and Engineering of Light Metals, (1991), 971.

[5] R. D. Doherty: Met. Sci., 16(1982), 1.

[6] H. Suzuki, M. Kanno and H Saito: J. Jpn. Inst. Light Metals, 33(1992), 399.

[7] V. Randle and B. Ralph: Acta Metall., 34(1986), 891.

[8] E. Nes: Met. Sci., 13(1979), 211.

In order to see related information, you need to Login.