Spray Forming of AZ91 Magnesium Alloys with and without Si Addition

Abstract:

Article Preview

ray forming was employed to refine the microstructures of AZ91 and AZ91-3.34wt%Si Mg alloys during solidification by means of rapid solidification generated at atomization and droplet flight stages. The process parameters of spray forming were varied to reduce the porosity level and improve the morphology of the billet preforms. As-spray-formed microstructures were characterized using OM, SEM/EDS, and XRD, which were compared with as-cast microstructures. The significant differences of grains, Mg2Si and Mg17Al12 in morphology and in size between as-spray-fromed and as-cast materials are mainly due to fast cooling and solidification rates of spray forming process. Supersaturated matrix is found in as-spray-formed materials due to rapid solidification generated by spray forming. Overall, spray-formed materials are shown to have four characteristics, which are much finer microstructures, uniformly distributed phases, equiaxed-shaped phases, and supersaturated matrix.

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

2789-2794

DOI:

10.4028/www.scientific.net/MSF.475-479.2789

Citation:

C.Y. Chen and C. Y.A. Tsao, "Spray Forming of AZ91 Magnesium Alloys with and without Si Addition", Materials Science Forum, Vols. 475-479, pp. 2789-2794, 2005

Online since:

January 2005

Export:

Price:

$35.00

[1] M. Mabuchi and K. Higashi: Acta Materialia Vol. 44, no. 11, (1996), p.4611.

[2] G.H. Li, H.S. Gill, R.A. Varin: Metallurgical transactions A Vol. 24A, (1993), p.2383.

[3] N. Raghunahan, T. Sheppard: Materials Science and Technology Vol. 6, (1990), p.629.

[4] N.J. Grant: Progress in Material Science Vol. 39 (1995), p.497.

[5] [ M. De Sanctis: Materials Science and Engineering Vol. A141 (1991), p.103.

[6] J.F. Faure, G.J. Nussbaum, and G. Regazzoni: Process for obtaining magnesium alloys by spray forming deposition US Patent 5073207, 17. December, (1991).

[7] T. Elbert, F. Moll, K.U. Kainer: Powder Metallurgy Vol. 40, No. 2 (1997), p.126.

[8] E.J. Lavernia, J. Baram, E. Guitierrez: Materials Science and Engineering Vol. A132 (1991), p.119.

[9] C.Y. Chen and Chi Y.A. Tsao: Materials Science Forum Vol. 426, (2003), p.429.

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