Anisotropic and temperature-dependent growth mechanism of S-phase precipitates in Al–Cu–Mg alloy in relation with GPB zones
| Autor: | Shi-yun Duan, Li-mei Cha, Cui-lan Wu, Jianghua Chen, Shuang-bao Wang, Mei-jie Yin, Zi-ran Liu |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Morphology (linguistics) Precipitation (chemistry) Alloy Metals and Alloys Nucleation Crystal growth 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences Crystallography Precipitation hardening Phase (matter) 0103 physical sciences Materials Chemistry engineering 0210 nano-technology Anisotropy |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 26:1-11 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(16)64082-7 |
| Popis: | By employing atomic-resolution imaging and first principles energy calculations, the growth behavior of S -phase precipitates in a high strength Al–Cu–Mg alloy was investigated. It is demonstrated that the nucleation and growth of the S -phase precipitate are rather anisotropic and temperature-dependent companying with low dimensional phase transformation. There are actually two types of Guinier–Preston (GP) zones that determine the formation mechanism of S -phase at high aging temperatures higher than 180 °C. One is the precursors of the S -phase itself, the other is the structural units or the precursors of the well-known Guinier–Preston–Bagaryatsky (GPB) zones. At high temperatures the later GPB zone units may form around S -phase precipitate and cease its growth in the width direction, leading to the formation of rod-like S -phase crystals; whereas at low temperatures the S -phase precipitates develop without the interference with GPB zones, resulting in S -phase precipitates with lath-like morphology. |
| Databáze: | OpenAIRE |
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