Studies of Orientations of β″ Precipitates in Al-Mg-Si-(Cu) Alloys by Electron Diffraction and Transition Matrix Analysis
Studies of Orientations of β″ Precipitates in Al-Mg-Si-(Cu) Alloys by Electron Diffraction and Transition Matrix Analysis
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DOI：
10.1007/s11661-011-0680-5
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Wenchao Yang;Mingpu Wang;Yanlin Jia;Ruirong Zhang
中科院分区：
文献类型：
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作者：
Wenchao Yang;Mingpu Wang;Yanlin Jia;Ruirong Zhang
Transition matrix, combine with high-resolution transmission electron microscopy (HRTEM) and stereographic projection, was used in this article to predict and characterize the orientations and electron diffraction patterns ofβ″ precipitates in Al-Mg-Si-(Cu) alloys. It was found that theβ″ phases as the main strengthening precipitates had 12 variants with Al matrix, and the orientation relationships could be expressed as (010)β″//{100}Al, [001]β″//<310>Al, and [100]β″//<230>Al. Further, based on the C-centered monoclinic structure ofβ″ precipitate, a new diffraction patterns model under the [001]Alzone axis could be established, which was in good agreement with the experiment date. Further, it could be used to explain reasonably some issues (for example, the “cross-shaped” diffraction streaks phenomenon). Simultaneously, we also found that theβ″ precipitates had only three different zone axes, [010]β″, [304]β″, andparallel to the [001]Aldirection when they were precipitated from the Al matrix, and theβ″ precipitate might deviate 1.6 deg from its original orientation because of the lattice relaxation.
