Abstract:By means of the available crystal parameters of precipitates and the orientation relationships between the precipitates and the matrix in aluminium alloys, the diffraction patterns of all possible precipitates have been simulated, which agrees with experimental observations in LD₁₀ alloy. The method used was to transform the reciprocal lattice vectors g_p of the precipitate phases into unit normal vector on the matrix lattice, and to check up whether those g_p satisfy the Bragg condition and then to determine the locations of diffraction spots on the matrix diffraction pattern. The method is applicable to any system where the orientation relationships and lattice parameters of matrix and precipitate phase are known.

Key words: precipitate; simulated diffraction pattern; transformation matrix