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Microstructures evolution and mechanical properties disparity in 2070 Al-Li alloy with minor Sc addition
- Source :
- Transactions of Nonferrous Metals Society of China. 28:2151-2161
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 10036326
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Transactions of Nonferrous Metals Society of China
- Accession number :
- edsair.doi...........3192d0315a3d8d91b5383b1228c6c0de