HRTEM Observation of Rod-Shape Precipitates in Al-Mg-Si-Ag Alloy Aged at 523 K

Abstract:

The purpose of this study is to identify the crystal structure of metastable phase in Ag added Al-Mg-Si alloy to compare the formation of β’-phases in Al-Mg-Si alloys without Ag, using images of high resolution transmission electron microscope (HRTEM), selected area electron diffraction (SAED) patterns and an energy dispersive X-ray spectroscopy (EDS). The result of SAED patterns and HRTEM images have been simulated and compared with images then SAED patterns obtained from actual precipitates. SAED patterns and HRTEM images obtained from metastable phase in the Ag added Al-Mg-Si alloy showed similar to those of β’-phase in Al-Mg-Si alloy without Ag and the lattice spacings changed because of the effect of Ag.

• Periodical: Materials Science Forum (Volumes 561-565)
• Pages: 243-246
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.561-565.243
• Online since: October 2007
• Authors: Junya Nakamura, Kenji Matsuda, Yoshio Nakamura, Tatsuo Sato, Susumu Ikeno
• Keywords: Ag Added, Al-Mg-Si Alloy, Crystal Structure, High Resolution Transmission Electron Microscopy, Precipitation, ϐ' Phase

References

[1] Polmear, I.: Trans. AIME, Vol. 230, pp.1331-1338, (1964).

[2] Baba, Y. and Takashima, A.: J. Japan Inst. Light Metals, Vol. 19, pp.90-98, (1969).

[3] Matsuda, K., Kido, K., Kawabata, T., Uetani, U. and Ikeno, S.: J. Japan Inst. Light Metals, Vol. 53, No. 11, pp.528-533, (2003).

[4] Gaber, A., Matsuda, K., Ali, A.M., Ziu, Y. and Ikeno, S.: Mat. Sci. Tech., Vol. 20, pp.1627-1631, (2004).

[5] Kenji Matsuda, Shizuo Tada and Susumu Ikeno : J Electron Microsc., Vol. 42, 1 (1993) 1-6.

[6] Matsuda, K., Ikeno, S. and Tada, S.: J. Japan Inst. Metals, Vol. 57, No. 10, pp.1107-1113.