Paper Title:
TEM Observation of Metastable Phases in Aged Al-Mg-Ge Alloys
  Abstract

The purpose of study is to investigate aging behavior, crystal structures of metastable phase and relative frequency of metastable phases in aged Al-Mg-Ge and Al-Mg-Ge-Si alloys using high resolution transmission electron microscope (HRTEM), energy dispersive X-ray spectroscopy (EDS) and electron energy-loss spectroscopy (EELS). Every alloy included rod-shaped precipitate which is the same as the typical metastable pahse, ’, in Al-Mg-Si alloy. Except to Mg-rich alloys, the Type-A precipitate, which is a typical metastable phase in the excess Si type Al-Mg-Si alloys and popular at over aged condition, was confirmed as a large rod-shaped precipitates in those alloys. This behavior is probably depends on the ratio of Mg/Ge. Also, Mg, Si and Ge were detected from the ’-phase in Al-Mg-Ge-Si alloy by EELS. This means that the ’-phase in Al-Mg-Ge-Si alloy consists of these 3 elements including Si, not just Ge to form metastable Mg2Ge.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
930-933
DOI
10.4028/www.scientific.net/MSF.654-656.930
Citation
K. Matsuda, J. Nakamura, K. Yamamoto, T. Kawabata, Y. Uetani, S. Ikeno, "TEM Observation of Metastable Phases in Aged Al-Mg-Ge Alloys", Materials Science Forum, Vols. 654-656, pp. 930-933, 2010
Online since
June 2010
Export
Price
$32.00
Share

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

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

Authors: Zhuo Qun Li, Da Yong Shan, Wei Ke, En Hou Han
Abstract:Microstructural examinations of T6-treated WE54 magnesium alloy were conducted after different aging conditions, and the influence of aging...
533
Authors: Shogo Mori, Tokimasa Kawabata, Kenji Matsuda, Susumu Ikeno
Abstract:The age hardening precipitates of Mg-4.7mass%Zn alloy aged at 423K,473K were studied by using high-resolution transmission electron...
157
Authors: Takafumi Fujii, Tokimasa Kawabata, Kenji Matsuda, Susumu Ikeno
Abstract:Precipitates in a Mg–Gd–Sc alloy with high Sc content (up to 13mass%) were examined by means of transmission electron microscopy. Plate-like...
627
Authors: Tomoatsu Murakami, Kenji Matsuda, Takeshi Nagai, Junya Nakamura, Tokimasa Kawabata, Susumu Ikeno
Chapter 2: Aluminium Alloys
Abstract:It is known that Al-Mg-Ge alloy shows the similar precipitation sequence to Al-Mg-Si alloy, and its equilibrium phase is β-Mg2Ge...
63
Authors: Daisuke Nakagawa, Tokimasa Kawabata, Kenji Matsuda, Susumu Ikeno
Chapter 10: Magnesium Alloys
Abstract:HRTEM observation was performed to clarify the early stage of precipitation in Mg-Gd-Y alloy aged at 473 K. The hardness increased with...
350