Effect of Solidification Rate and Composition on Segregation in Al-Li-Cu-Zr Alloys
In the present study, solidification and segregation of Al-Li-Cu-Zr alloys have been investigated. Results show that shape of ingots and amount of lithium can change solidification essence. Increasing solidification rate, not only eliminates grain-refining effect of zirconium but also causes coarse segregation of copper in grain boundaries (negative segregation). Increasing amount of lithium in Al-Cu-Li-Zr alloys can change the solubility of other alloying elements (Cu, Zr) and increase solidification range and microsegregation of copper in structure.
Andreas Öchsner and José Grácio
S. Ahmadi et al., "Effect of Solidification Rate and Composition on Segregation in Al-Li-Cu-Zr Alloys", Defect and Diffusion Forum, Vols. 258-260, pp. 15-19, 2006