Microstructures evolution and mechanical properties disparity in 2070 Al-Li alloy with minor Sc addition
| Autor: | Dan-yang Liu, Jie-xia Wang, Jin-feng Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Alloy Metals and Alloys Recrystallization (metallurgy) 02 engineering and technology Electron microprobe Supersaturated solid solution engineering.material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Grain growth Chemical engineering 0103 physical sciences Materials Chemistry engineering 0210 nano-technology Mass fraction Tensile testing |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 28:2151-2161 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(18)64860-5 |
| Popis: | The microstructures and mechanical properties of Al-3.35Cu-1.2Li-0.4Mg-0.4Zn-0.3Mn-0.1Zr (mass fraction, %) alloy with Sc addition or free Sc were investigated through tensile test, SEM, EPMA and TEM. The addition of 0.082% (mass fraction) Sc element leads to the formation of Cu-rich and Sc-contained nano-sized Al3(ScZr) particles and W phase particles. The Al3(ScZr) particles can inhibit recrystallization to a certain extent and impede recrystallized grain growth during solution treatment. It is found that W phase cannot dissolve in supersaturated solid solution during the solution heat treatment, and the Cu content in the solutionized matrix is decreased, which causes a decrease in the fraction of Cu-contained strengthening precipitates with T1 (Al2CuLi) and θ′ (Al2Cu) under T8 aging condition. Due to the formation of the W phases, the small Sc addition causes a little reduction in the strength. |
| Databáze: | OpenAIRE |
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