(昆明理工大学 材料与冶金工程学院，昆明 650093)
摘 要: 通过建立界面扰动模型，推导了三元固态置换反应系界面稳定性的化学势梯度判据。结果表明：如果扰动微区前沿速率控制元素的化学势梯度升高小于20.7%，平面界面稳定长大，将形成层状结构；若大于20.7%，平面界面不稳定长大，将形成束集型结构。计算了某一常见假设下棒状束集型结构的束集密度。
关键字: 固态置换反应； 原位复合材料； 界面稳定性； 束集密度
solid-state displacement reaction
（School of Materials and Metallurgy Engineering,
Kunming University of Science and Technology, Kunming 650093, P.R.China）
Abstract:A new interface-perturbation model of ternary system is suggested and the interface-stability criterion is derived in the form of chemical potential. If the chemical potential of rate-control-element at frontier of tiny perturbative zone goes up less than 20.7%,linear interface will grow up stablly and form layered structure; if it goes up more than 20.7%, linear interface is not stable and will form aggregate structure. The aggregate density of rod-aggregate structure is also calculated on the basis of a common presumption.
Key words: solid-state displacement reaction; in-situ composite; interface stability; aggregate density
