Spacing characterization in Al-Cu alloys directionally solidified under transient growth conditions

作者：Amoorezaei Morteza^*; Gurevich Sebastian; Provatas Nikolas

来源：Acta Materialia, 2010, 58(18): 6115-6124.

DOI：10.1016/j.actamat.2010.07.029

• Directional solidification, Dendrite, History dependent
• Phase field simulation, Transient state

We study spacing selection in directional solidification of Al-Cu alloys under transient growth conditions. New experimental results are presented which reveal that the mean dendritic spacing vs. solidification front speed exhibits plateau-like regions separated by regions of rapid change, consistent with previous experiments of Losert and co-workers. Quantitative phase-field simulations of directional solidification with dynamical growth conditions approximating those in the experiments confirm this behavior The mechanism of this type of change in mean dendrite arm spacing is consistent with the notion that a driven periodically modulated int

• 出版日期2010-10