Retrogression characteristics of a novel Al-Cu-Li-X alloy
| Autor: | Changsheng Li, Sheng-long Dai, Xiuliang Wu, Zhi-shan Yuan, Zheng Lu, You-hua Xie |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Precipitation (chemistry) Mechanical Engineering Alloy Metals and Alloys engineering.material Microstructure Indentation hardness Dark field microscopy Differential scanning calorimetry Geochemistry and Petrology Mechanics of Materials Materials Chemistry engineering Grain boundary Selected area diffraction Composite material |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 17:624-628 |
| ISSN: | 1869-103X 1674-4799 |
| Popis: | Retrogression characteristics of a novel Al-Cu-Li-X alloy of 2A97 were studied by hardness testing, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The retrogression treatments of aging at 155°C for 12 h followed by aging at 220 and 240°C were chosen by determining the peak temperature of δ′ precipitation at 230°C by DSC. The retrogression treatment at a lower temperature of 220°C causes the precipitation and coarsening of δ′ and θ′ phases in the matrix, resulting in an increase in hardness. Retrogression at a higher temperature of 240°C causes the dissolution and coarsening of δ′ and θ′ precipitates in the matrix and on the grain boundaries, resulting in a decrease in hardness. Microstructural changes upon retrogression including the appearance of equilibrium precipitates such as T1, T2, δ′, and θ are confirmed by the selected area electron diffraction and the bright and dark field image analysis. |
| Databáze: | OpenAIRE |
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