HRTEM Study of Precipitates in Al-Mg-Si and Al-Mg-Ge Alloys


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In this work, the crystal structure of the rod-shaped precipitate in aged Al -1.0 mass% Mg2Ge alloy at 523 K has been investigated by high resolution transmission electron microscopy (HRTEM), electron diffraction technique and energy dispersive X-ray spectroscopy (EDS). The rod-shaped precipitate in its alloy has showed the similar arrangement of bright dots in its HRTEM images and selected area diffraction pattern (SADP) to those of the b’-phase in Al-Mg2Si alloy. But a lattice constant of this precipitate in Al-Mg2Ge alloy was slightly larger than the b’-phase in Al-Mg2Si alloy. In addition, the new metastable phase has been found out in Al-Mg-Ge alloy.



Materials Science Forum (Volumes 519-521)

Edited by:

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




K. Matsuda et al., "HRTEM Study of Precipitates in Al-Mg-Si and Al-Mg-Ge Alloys", Materials Science Forum, Vols. 519-521, pp. 221-226, 2006

Online since:

July 2006




[1] Lutts, A.: Pre-precipitation in Al-Mg-Ge and Al-Mg-Si, Acta Met., Vol. 9, pp.577-586, (1961).


[2] Matsuda, K., Tada, S. and Ikeno, S.: The morphology of precipitates in an Al-1 wt%Mg2Si alloy, J. Electron Micro., Vol. 42, pp.1-6, (1993).

[3] Matsuda, K., Ikeno, S. and Tada, S.: Crystal structure of rod-shaped precipitates in Al-1. 0 mass% Mg2Si alloy, J. Japan Inst Metals, Vol. 57, pp.1107-1113, (1993).

[4] Matsuda, K., Tada, S., Ikeno, S., Sato, T. and Kamio, A., Crystal system of rod-shaped precipitates in an Al-1. 0 mass% Mg2Si - 0. 4 mass% Si alloy, Scripta Met. Mater., Vol. 32, pp.1175-1180, (1995).


[5] Matsuda, K., Ikeno, S., Matsui, H., Sato, T., Terayama, K. and Uetani, Y.: Comparison of precipitates between excess Si-type and balanced-type Al-Mg-Si alloys during continuous heating, Met. Mater. Trans. A, Vol. 36A, pp.2007-2012.