Effects of Scandium on the Microstructure and Tensile Behavior of Al-Li-Cu-Mg-Zr Alloy
The effects of various Sc contents on the microstructure, tensile properties, and fracture behavior of Al-Li-Cu-Mg-Zr alloy in the natural- and artificial-aged conditions have been investigated. The temperature dependence of the tensile properties of these alloys was determined in the rolling direction from 290 to 77 K. As the temperature decreased, the strength and ductility of the Sc-containing alloys increased. In all the alloys, δ′ (A13Li) and S′ (Al2CuMg) are the main strengthening phases, and in the Sc-containing alloys, A13Li/A13Sc particles also were effective in improving the strength. The variation of positron annihilation parameters with test temperature was also measured.
KeywordsPositron Annihilation Peak Aged Peak Aged Condition Positron Lifetime Spectrum Peak Aged Alloy
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