Statistical Mechanics of Microstructure Evolution

9214852对两相二元合金的几何演化和微观组织动力学进行了实验和理论研究。这项研究的两个主要目的是：(1)建立一个适当的数据统计框架，用于描述从初始相变状态向热力学平衡演变的复杂三维微结构的平均几何轨迹；(2)配套实验，提供精确的体视学数据，以量化在明确定义的成分、温度、相分数等条件下观察到的微结构变化。实验包括等时退火研究，包括在有和没有外加磁场的情况下消除固液合金中的微对流，然后用一种新的图像处理工具进行立体分析。%这项研究将增加对复杂的、具有重要技术意义的系统在加工过程中如何以几何和动力学方式演化并接近热力学平衡的基本理解。***

9214852 Glicksman Experimental and theoretical studies are conducted on the geometric evolution and kinetics of microstructures in two-phase binary alloys. The two main thrusts of the research are: (1) creation of a suitable data statistical framework for describing the average geometrical trajectories of complex 3-dimensional microstructures evolving from their initial phase transformation states toward thermodynamic equilibrium; and (2) companion experiments which provide precision stereological data to quantify observed microstructural changes occurring under well defined conditions of composition, temperature, phase fraction, etc. The microstructural trajectories are themselves described quantitatively on a geometric phase plane". Experiments include isochronal annealing studies, both with and without an applied magnetic field to eliminate microconvection in solid-liquid alloys, then analyzed stereologically with a new image processing tool. %%% This study should add fundamental understanding of how complex, technologically important systems evolve geometrically and kinetically during processing and approach thermodynamic equilibrium. ***