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Retrogression characteristics of a novel Al-Cu-Li-X alloy
Retrogression characteristics of a novel Al-Cu-Li-X alloy
- Source :
- International Journal of Minerals, Metallurgy, and Materials. 17:624-628
- Publication Year :
- 2010
- Publisher :
- Springer Science and Business Media LLC, 2010.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 1869103X and 16744799
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- International Journal of Minerals, Metallurgy, and Materials
- Accession number :
- edsair.doi...........aa1ab9118271722ebaa3cd24a5b92613
- Full Text :
- https://doi.org/10.1007/s12613-010-0365-x