TEM Observation of Metastable Phases in Aged Al-Mg-Ge Alloys
TEM Observation of Metastable Phases in Aged Al-Mg-Ge Alloys
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时效 Al-Mg-Ge 合金中亚稳相的 TEM 观察
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Ikeno
中科院分区：
文献类型：
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作者：
K. Matsuda;J. Nakamura;Keisuke Yamamoto;T. Kawabata;Y. Uetani;S. Ikeno
利用高分辨透射电镜（HRTEM）、X射线能谱（EDS）和电子能量损失谱（EELS）研究了Al-Mg-Ge和Al-Mg-Ge-Si合金的时效行为、亚稳相的晶体结构和亚稳相的相对出现频率。在Al-Mg-Si系合金中，每种合金都含有棒状析出相，这与Al-Mg-Si系合金中典型的亚稳相γ ′相同。除富Mg合金外，过剩Si型Al-Mg-Si合金中的A型析出相是典型的亚稳相，在过时效条件下普遍存在，在这些合金中，A型析出相是一种大的棒状析出相。这种行为可能取决于Mg/Ge的比例。EELS还从Al-Mg-Ge-Si合金的γ ′相中检测到Mg、Si和Ge。这意味着Al-Mg-Ge-Si合金中的“相由包括Si的这3种元素组成，而不仅仅是Ge，从而形成亚稳的Mg 2Ge。
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.