摘要
The effects of the contents of Ce and deleterious impurities on the ductility and recrystallized microstructure have been investigated for Al Li based alloys 2090 and 8090 sheets. The relationships between the parameters of recrystallized microstructure and percentage elongation( δ ) in the transverse orientation of the sheets have been obtained. The beneficial behavior of Ce microalloying can be markedly shown in the alloy 2090 containing a certain amount of impurities Fe and Si or in the alloy 8090 containing a certain amount of impurities Na and K. Ce microalloying can still improve δ to a certain degree, even though impurities Fe, Si, Na and K coexist and their concentration is rather high in the alloy 8090. When the recrystallized volume, coarse grained volume and grain average width increase because of the variation in the contents of Ce element and impurities, δ decreases for the alloys 2090 and 8090. When the grain aspect ratio increases, δ increases for the alloy 2090 and decreases for the alloy 8090.
The effects of the contents of Ce and deleterious impurities on the ductility and recrystallized microstructure have been investigated for Al Li based alloys 2090 and 8090 sheets. The relationships between the parameters of recrystallized microstructure and percentage elongation( δ ) in the transverse orientation of the sheets have been obtained. The beneficial behavior of Ce microalloying can be markedly shown in the alloy 2090 containing a certain amount of impurities Fe and Si or in the alloy 8090 containing a certain amount of impurities Na and K. Ce microalloying can still improve δ to a certain degree, even though impurities Fe, Si, Na and K coexist and their concentration is rather high in the alloy 8090. When the recrystallized volume, coarse grained volume and grain average width increase because of the variation in the contents of Ce element and impurities, δ decreases for the alloys 2090 and 8090. When the grain aspect ratio increases, δ increases for the alloy 2090 and decreases for the alloy 8090.
