Material World Network: Theoretical, Computational and Experimental Studies of 3D Microstructural Evolution in Ultra-high Volume Fraction Coarsening System

提出了一个为期三年的研究计划，进行理论，计算和实验研究的三维相粗化在超高体积分数（V V ≥ 0.9）固液混合物。本计画的主要目标是：（1）利用时间分辨X射线显微层析术，在原位量测两相系统的三维微结构演化，从而同时揭示粗化的整体平均动力学和内部界面的局部迁移;（2）对超高V-V下的三维相粗化进行大规模相场模拟，获得关于所述变换的全局和局部特性的预测;（3）发展了一种新的超高V-V相粗化理论，填补了Lifshitz/ Slyozov/瓦格纳理论在低V-V相粗化方面的差距，和晶粒生长理论（V V 1.0）;（4）通过将其预测结果与模拟和实验结果进行定量比较来检验和改进理论。该项目是美国科学家和德国科学家之间的合作，美国科学家将从事理论和计算方面的研究，德国科学家将通过断层扫描进行样品制备和表征。

A three-year research project is proposed to conduct theoretical, computational and experimental studies of three-dimensional phase coarsening in ultra-high-volume-fraction (V V 0.9 ) solid-liquid mixtures. The primary goals of this project are (1) to measure the three-dimensional microstructural evolution of two-phase systems in situ using timeresolved x-ray microtomography, thus revealing simultaneously the globally averaged kinetics of coarsening and the local migration of internal interfaces; (2) to conduct largescale phase-field simulations of 3-D phase coarsening at ultra-high V V , obtaining predictions regarding the global and local characteristics of the transformation; (3) to develop a new theory for phase-coarsening at ultra-high V V , thus filling the gap between the Lifshitz/ Slyozov/Wagner theory, which is valid at low V V , and theories for grain growth (V V 1.0 ); and (4) to test and improve the theory by comparing its predictions quantitatively to the results of simulation and experiment. The project is a collaborative effort between scientists in the USA, who will pursue the theoretical and computational aspects, and Germany, where the sample preparation and characterization via tomography will be carried out.