Ａｌ‐１．１％Ｍｇ２Ｇｅ合金における時効析出物の高分解能透過型電子顕微鏡観察
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Rod-shaped precipitates in Al–1.1mass%Mg2Ge (Al–0.52at%Mg–0.24at%Ge) alloy aged at 523 K were observed by high-resolution transmission electron microscope (HRTEM) to understand their crystal lattices and chemical compositions. Rod-shaped precipitates were parallel to ‹100› directions of the matrix. There were 2 groups for rod-shaped precipitates, namely, small cross sections about 10 nm and large ones over 20 nm in diameter. Small precipitates showed a hexagonal network of bright dots in their HRTEM images, and its crystal lattice was estimated as a hexagonal having a=0.72 and c=0.405 nm based on analysis of HRTEM images and selected area electron diffraction (SAED) patterns. This lattice parameter was slight larger than that of the β′-phase in Al–Mg–Si alloy. Its orientation relationship with the matrix was as follows: {0001}p//{001}m, ‹1120›p//‹100›m. Precipitates having large cross section showed a rectangular network having 0.68 and 0.35 nm. This was similar feature to the A-type precipitate in the Al–Mg–Si alloy with excess Si. A crystal lattice of this precipitate was estimated as a hexagonal having a=0.405 and c=0.68 nm based on analysis of HRTEM images and SAED patterns. Mg and Ge elements were detected from these precipitates by energy dispersive X-ray spectroscopy (EDS) and the ratio of Mg to Ge (Mg/Ge) for the small precipitate which is similar to the β′-phase in Al–Mg–Si alloy, was about 3, not 2. The Mg/Ge for large precipitates which are similar to the A-type precipitate in Al–Mg–Si alloy was 2, and this ratio was larger than that of the A-type precipitate in Al–Mg–Si alloy. It has been expected that these differences of chemical composition for precipitates caused the increment of lattice parameters of precipitates in Al–Mg–Ge alloy.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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