A precipitate phase in AA2124 |
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Authors: | Yan Jin Chunzhi Li Minggao Yan |
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Affiliation: | (1) Institute of Aeronautical Materials, 100095, Beijing;(2) Laboratory of Solid Atomic Images, Institute of Metals, Academic Sinica, Shenyang, People's Republic of China |
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Abstract: | A new precipitate phase (designated X phase) other than the S(Al2CuMg) precipitate phase has been discovered in the 2124 aluminium alloy. Using selected-area electron diffraction analysis, dynamical diffraction simulation, energy dispersion analysis of X-rays and high-resolution electron microscopy, it is suggested that the X phase has an orthorhombic crystal structure witha=0.492 nm,b=0.852 nm andc=0.701 nm. The space group of the phase is Cmmm. There are 10 atoms in a cell with Al Cu Mg=2 4 4. The orientation relationship between the X phase and the matrix is determined as (1–10)m (010)x, –1–1–1]m 001]x. |
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