The diffraction patterns from β″ precipitates in 12 orientations in Al–Mg–Si alloy

Various orientations and diffraction patterns of metastable β″ precipitates during artificial aging are investigated by means of high-resolution electron microscopy and electron diffraction in Al–Mg–Si alloys. Twelve orientations of β″ precipitates with C-centered monoclinic crystal structure are analyzed systematically. The orientation relationships can be expressed as: (0 1 0)β″//{1 0 0}Al; [0 01 ]β″//<3 1 0>Al; [1 0 0]β″//<2 3 0>Al. In addition, a new diffraction patterns model from β″ precipitates in 12 orientations is established under the [0 0 1]Al zone axis.