The Square Root Diffusivity

这项研究工作的目标是模拟复杂的扩散 用简单但严格的方程式来处理。 这些方程 已经从单相系统中推导出， 平方根扩散系数 实验研究是使用 扩散偶含有小浓度差， 以满足恒定扩散率假设。 计算机 正在开发一个程序来预测 扩散偶包含多达八种合金元素。 这 研究高温加工技术是重要的 例如包埋渗碳、氧化和退火。 扩散 导致高温材料系统的性能退化 例如涂覆的涡轮机叶片和金属基复合材料。 这 研究应该为这些提供有价值的预测能力。 类似的过程。

The goal of this research effort is to model complex diffusional processes with simple, but rigorous equations. These equations have already been derived for single phase systems in terms of the square root diffusivity. Experimental studies are made using diffusion couples containing small concentration differences in order to satisfy a constant diffusivity assumption. A computer program is being developed to predict concentration profiles in diffusion couples that contain up to eight alloying elements. This research is important to high temperature processing techniques such as pack cementation, oxidation and annealing. Diffusion causes property degradation in high temperature materials systems such as coated turbine blades and metal-matrix composites. This research should provide valuable predictive capabilities for these and similar processes.