期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.03.032
关键词
Al-Zn-Mg-Cu alloy; Precipitation; Nucleation; eta ' phase; eta phase; Scanning transmission electron microscopy
The present study, using advanced Cs-corrected high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), reports on a comprehensive investigation into the precipitate structures in an Al-Zn-Mg-Cu alloy aged at 150 degrees C, including GP zones,eta' and eta precipitates. In the nucleation stage, Zn atoms enrich on the {111}Arplanes abutting spherical Mg clusters that are approximately 3-6 nm in diameter. In the subsequent growth, the as-nucleated structures extend with an increasing diameter and a constant width along [111](Al) and grow into platelet precipitates. eta' is proved to be a group of metastable structures existing in the transition from FCC Al to HCP MgZn2 (eta). Some metastable structures are assembled by local-ordered rhombohedral units and orthorhombic units as building blocks. Subsequently, the precipitates evolve into eta phases with stacking faults.
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