TEM Observation for Precipitates Structure of Al-1.0Mass%Mg₂Ge Alloys Aged at 473K

Abstract:

It is known that Al-Mg-Ge alloys show a similar precipitation sequence to that of Al-Mg-Si alloys, and that ther equilibrium phase is β-Mg₂Ge according to the phase diagram. In this study, the precipitation sequence and age-hardening behavior of Al-1.0mass%Mg₂Ge alloys has been investigated by hardness test, write out in full first time used TEM and HRTEM observations on.The hardness curves showed no big difference between peak values hardness for samples aged at 423, 473 and 523K. The precipitates in the peak-aged samples have been classified as some metastable phases, such as the β’-phase and parallelogram-type precipitates by HRTEM observation. The large precipitates are similar to the A-type precipitate in the Al-Mg-Si alloy with excess Si.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 992-995
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.992
• Online since: June 2014
• Authors: Akihiro Kawai, Keisuke Matsuura, Katsumi Watanabe, Kenji Matsuda*, Susumu Ikeno
• Keywords: Age Hardening, Al-Mg-Ge Alloy, HRTEM, Precipitation, TEM

References

[1] K. Matsuda , T. Munekata , T. Kawabata , Y. Uetani and S. Ikeno: J. Inst. Light. Metals, 56, 11 (2006) 680-684. Figure. 3 The age-precipitates images of (a) aged for 6ks (b) and (c) aged for 2400ks.

DOI: 10.2464/jilm.56.680