|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Probing the Growth and Dissolution Pathways of Quasicrystals in Real-time
||Insung Han, Xianghui Xiao, Ashwin Shahani
|On-Site Speaker (Planned)
How does a quasicrystal grow? To answer this question, we have performed synchrotron-based experiments on a decagonal (i.e., two-dimensional) quasicrystal with a composition of Al-8wt%Co-8wt%Ni. High-flux X-ray tomography enabled us to capture projections at temperature, during continuous cooling. By reconstructing the data in three dimensions, we were able to obtain new insights on the growth and dissolution pathways of the quasicrystals. We have determined that there is no time-reversal symmetry upon growth and melting of the decagonal quasicrystal, similar to other periodic, faceted crystals. While quasicrystal growth is limited by the attachment kinetics of atomic clusters in the liquid phase, melting is instead limited by buoyancy-driven convection. These experimental results provide the much-needed benchmark data that can be used to validate simulations of phase transformations involving this unique phase of matter.
||Planned: Supplemental Proceedings volume